Relevant bibliographies by topics / Color centers

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Color centers'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 July 2024

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Journal articles on the topic "Color centers"

1

Fan, Yexin, Ying Song, Zongwei Xu, Jintong Wu, Rui Zhu, Qiang Li, and Fengzhou Fang. "Numerical study of silicon vacancy color centers in silicon carbide by helium ion implantation and subsequent annealing." Nanotechnology 33, no. 12 (December 24, 2021): 125701. http://dx.doi.org/10.1088/1361-6528/ac40c1.

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Abstract Molecular dynamics simulation is adopted to discover the formation mechanism of silicon vacancy color center and to study the damage evolution in 4H-SiC during helium ion implantation with different annealing temperatures. The number and distribution of silicon vacancy color centers during He ion implantation can be more accurately simulated by introducing the ionization energy loss during implantation. A new method for numerical statistic of silicon vacancy color centers is proposed, which takes into account the structure around the color centers and makes statistical results more accurate than the Wigner–Seitz defect analysis method. Meanwhile, the photoluminescence spectra of silicon vacancy color centers at different helium ion doses are characterized to verify the correctness of the numerical analysis. The new silicon vacancy color center identification method can help predicting the optimal annealing temperature for silicon vacancy color centers, and provide guidance for subsequent color center annealing experiments.
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Litvak, Ira, Avner Cahana, Yaakov Anker, Sharon Ruthstein, and Haim Cohen. "Nitrogen Structure Determination in Treated Fancy Diamonds via EPR Spectroscopy." Crystals 12, no. 12 (December 7, 2022): 1775. http://dx.doi.org/10.3390/cryst12121775.

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Color induction in nitrogen-contaminated diamonds was carried out via various procedures that involve irradiation, thermal treatments (annealing), and more. These treatments affect vacancy defect production and atom orientation centers in the diamond lattice. Natural diamonds underwent color enhancement treatments in order to produce green, blue, and yellow fancy diamonds. The aim of this study was to follow the changes occurring during the treatment, mainly by EPR spectroscopy, which is the main source for the determination of the effect of paramagnetic centers (carbon-centered radicals) on the color centers produced via the treatments, but also via visual assessment, fluorescence, UV-vis, and FTIR spectroscopy. The results indicate that diamonds containing high levels of nitrogen contamination are associated with high carbon-centered radical concentrations. Four paramagnetic center structures (N1, N4, and P2/W21) were generated by the treatment. It is suggested that the N4 structure correlates with the formation of blue color centers, whereas yellow color centers are attributed to the presence of N1 species. While to produce blue and yellow colors, a thermal treatment is needed after irradiation, for treated green diamonds, no thermal treatment is needed (only irradiation).
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R. Varney, Chris, and Farida A. Selim. "Color centers in YAG." AIMS Materials Science 2, no. 4 (2015): 560–72. http://dx.doi.org/10.3934/matersci.2015.4.560.

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Matsuyama, S., K. Ishii, H. Yamazaki, H. Endoh, H. Yuki, T. Satoh, S. Sugihara, et al. "COLORATION OF POLYETHYLENE TEREPHTHALATE (PET) FILM BY 3MeV PROTON BEAMS." International Journal of PIXE 11, no. 03n04 (January 2001): 93–101. http://dx.doi.org/10.1142/s0129083501000141.

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Coloration of polyethylene terephthalate (PET) films by using 3 MeV proton beams was studied by means of absorption spectroscopy, electron spin resonance (ESR) spectroscopy and Fourier transform infrared absorption (FT-IR) spectroscopy. Absorbance of the films increased with the dose and faded in time. Absorbance changes are caused by formation of color centers. The color centers had three components: permanent, long-lived and short-lived. Long-lived and short-lived color centers were formed by reactive species such as radicals. Annealing of color center is well explained by a proposed sequential process.
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Toledo, José R., Raphaela de Oliveira, Lorena N. Dias, Mário L. C. Chaves, Joachim Karfunkel, Ricardo Scholz, Maurício V. B. Pinheiro, and Klaus Krambrock. "Radiation-induced defects in montebrasite: An electron paramagnetic resonance study of O – hole and Ti3+ electron centers." American Mineralogist 105, no. 7 (July 1, 2020): 1051–59. http://dx.doi.org/10.2138/am-2020-7168.

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Abstract Montebrasite is a lithium aluminum phosphate mineral with the chemical formula LiAlPO4(Fx,OH1–x) and considered a rare gemstone material when exhibiting good crystallinity. In general, montebrasite is colorless, sometimes pale yellow or pale blue. Many minerals that do not have colors contain hydroxyl ions in their crystal structures and can develop color centers after ionization or particle irradiation, examples of which are topaz, quartz, and tourmaline. The color centers in these minerals are often related to O− hole centers, where the color is produced by bound small polarons inducing absorption bands in the near UV to the visible spectral range. In this work, colorless montebrasite specimens from Minas Gerais state, Brazil, were investigated by electron paramagnetic resonance (EPR) for radiation-induced defects and color centers. Although γ irradiation (up to a total dose of 1 MGy) did not visibly modify color, a 10 MeV electron irradiation (80 MGy) induced a pale greenish-blue color. Using EPR, O− hole centers were identified in both γ- or electron-irradiated montebrasite samples showing superhyperfine interactions with two nearly equivalent 27Al nuclei. In addition, two different Ti3+ electron centers were also observed. From the γ irradiation dose dependency and thermal stability experiments, it is concluded that production of O− hole centers is limited by simultaneous creation of Ti3+ electron centers located between two equivalent hydroxyl groups. In contrast, the concentration of O− hole centers can be strongly increased by high-dose electron irradiation independent of the type of Ti3+ electron centers. From detailed analysis of the EPR angular rotation patterns, microscopic models for the O− hole and Ti3+ electron centers are presented, as well as their role in the formation of color centers discussed and compared to other minerals.
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Kim, Suk Hyun, Kyeong Ho Park, Young Gie Lee, Seong Jun Kang, Yongsup Park, and Young Duck Kim. "Color Centers in Hexagonal Boron Nitride." Nanomaterials 13, no. 16 (August 15, 2023): 2344. http://dx.doi.org/10.3390/nano13162344.

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Atomically thin two-dimensional (2D) hexagonal boron nitride (hBN) has emerged as an essential material for the encapsulation layer in van der Waals heterostructures and efficient deep ultraviolet optoelectronics. This is primarily due to its remarkable physical properties and ultrawide bandgap (close to 6 eV, and even larger in some cases) properties. Color centers in hBN refer to intrinsic vacancies and extrinsic impurities within the 2D crystal lattice, which result in distinct optical properties in the ultraviolet (UV) to near-infrared (IR) range. Furthermore, each color center in hBN exhibits a unique emission spectrum and possesses various spin properties. These characteristics open up possibilities for the development of next-generation optoelectronics and quantum information applications, including room-temperature single-photon sources and quantum sensors. Here, we provide a comprehensive overview of the atomic configuration, optical and quantum properties, and different techniques employed for the formation of color centers in hBN. A deep understanding of color centers in hBN allows for advances in the development of next-generation UV optoelectronic applications, solid-state quantum technologies, and nanophotonics by harnessing the exceptional capabilities offered by hBN color centers.
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Sledz, Florian, Assegid M. Flatae, Stefano Lagomarsino, Savino Piccolomo, Shannon S. Nicley, Ken Haenen, Robert Rechenberg, et al. "Light emission from color centers in phosphorus-doped diamond." EPJ Web of Conferences 266 (2022): 09008. http://dx.doi.org/10.1051/epjconf/202226609008.

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Light emission from color centers in diamond is being extensively investigated for developing, among other quantum devices, single-photon sources operating at room temperature. By doping diamond with phosphorus, one obtains an n-type semiconductor, which can be exploited for the electrical excitation of color centers. Here, we discuss the optical properties of color centers in phosphorus-doped diamond, especially the silicon-vacancy center, presenting the single-photon emission characteristics and the temperature dependence aiming for electroluminescent single-photon emitting devices.
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Wang, Xiao‐Jie, Hong‐Hua Fang, Fang‐Wen Sun, and Hong‐Bo Sun. "Laser Writing of Color Centers." Laser & Photonics Reviews 16, no. 1 (November 13, 2021): 2100029. http://dx.doi.org/10.1002/lpor.202100029.

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Nakagawa, M., M. Okada, K. Atobe, H. Itoh, S. Nakanishi, and K. Kondo. "Color centers in irradiated MgF2." Radiation Effects and Defects in Solids 119-121, no. 2 (November 1991): 663–68. http://dx.doi.org/10.1080/10420159108220799.

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Panchenko, T. V., N. A. Truseyeva, and Yu G. Osetsky. "Color centers in Bi12SiO20single crystals." Ferroelectrics 129, no. 1 (May 1992): 113–18. http://dx.doi.org/10.1080/00150199208016981.

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Dissertations / Theses on the topic "Color centers"

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Karamlou, Amir H. "Towards quantum information processing with diamond color centers." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119749.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 59-63).
The DiVincenco requirements summarize the key properties that quantum systems should have to be useful for quantum computing. The work in this thesis focuses on one of the leading solid-state quantum systems, the nitrogen vacancy (NV) center in diamond. The NV has emerged as an excellent quantum sensor, in which quantum logic techniques can significantly improve performance. However, a remaining problem concerns the rate and fidelity of NV spin measurement. To address this problem in this thesis we first propose and theoretically demonstrate a scheme for spatially robust state-selective transitions with over 99.9% fidelity between different spin states in zero-field splitting. Furthermore, another central challenge tackled in this work is the efficient collection of the emitter's fluorescence. Optical antennas are appealing as they offer directional emission together with spontaneous emission rate enhancement across a broad emitter spectrum. We introduce and optimize metal-dielectric nano-antenna designs recessed into a diamond substrate and aligned with quantum emitters. We analyze trade-offs between external quantum efficiency, collection efficiency, Purcell factor, and overall collected photon rate. This analysis shows that an optimized metal-dielectric hybrid structure can increase the collected photon rate from a nitrogen vacancy center by over two orders of magnitude compared to a bare emitter. As a result, these metal-dielectric antennas should enable single-shot electron spin measurements of NV centers at room temperature.
by Amir H. Karamlou.
M. Eng.
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2

Nahra, Mackrine. "Color Centers in Nanodiamonds for Quantum Optics Applications." Electronic Thesis or Diss., Troyes, 2021. http://www.theses.fr/2021TROY0017.

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L’intérêt de trouver un émetteur quantique émettant des photons uniques à la demande devient de plus en plus important dans le domaine de l'optique quantique. Les centres colorés dans les nanodiamants (NDs) se révèlent être des candidats prometteurs. Cependant, la production de NDs ayant des centres colorés brillants et émettant des photons indiscernables reste un défi. Dans cette thèse, nous étudions les centres colorés du groupe IV, en particulier le SiV- et le GeV-, synthétisés par la méthode haute pression haute température (HPHT). Nous étudions l'effet des différents paramètres de croissance sur les propriétés optiques du SiV- et rapportons la largeur de raie la plus étroite de 6 GHz pour un ensemble de SiV- sous excitation hors résonante. En raison de la faible probabilité de trouver un SiV- unique, nous avons dirigé notre attention vers les GeV- où la probabilité de trouver un photon unique était significativement plus élevée. Ces GeV- possèdent des propriétés spectrales remarquables à température ambiante, y compris une raie à zéro phonon (ZPL) stable et brillante. Nous étudions la dynamique de leur population dans le cadre d'un modèle à trois niveaux. Nous rapportons un taux maximal de comptage d'émission de photons de 1,6 Mcps à saturation et une visibilité en polarisation de 92% de la lumière de fluorescence. Outre la ZPL, nous observons d'autres transitions électroniques situées dans la bande latérale des phonons du GeV-. Nous démontrons que la méthode HPHT produit des SiV- et GeV- dans les NDs ayant des propriétés optiques supérieures pour des applications en optique quantique
The emerging field of quantum optics has attracted the interest of finding an accessible solid-state quantum emitter generating single photons on-demand. Color centers in nanodiamonds (NDs) have shown to be promising candidates. However, producing NDs hosting bright and indistinguishable photons from color centers remains challenging. In this thesis, we study group IV color centers, particularly silicon vacancy (SiV-) and germanium vacancy (GeV-), synthesized by the high pressure high temperature (HPHT) method. We study the effect of the different growth parameters on the optical properties of the SiV- at room and low temperature (T) and report the narrowest linewidth of 6 GHz for an SiV- ensemble using off resonant excitation. Due to the low probability of finding a single SiV- center, we turn our attention to GeV- color centers where the probability of finding a single photon source was found to be significantly higher. Single GeV- in NDs with size ranging from 10 to 50 nm showed remarkable spectral properties at room T including a stable and a bright zero-phonon line (ZPL). We study their internal population dynamics in the framework of a three level model with intensity dependent de-shelving. We find a maximum photon emission count rate of 1.6 Mcps at saturation. We also report a polarization visibility of 92 % from the fluorescence light. Besides the ZPL, we analyze the origin of other transitions lying within the phonon sideband. We demonstrate that the HPHT method can produce SiV- and GeV- in NDs with superior optical properties required for quantum optics applications
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PEIRO, GREGORIO P. "Operacao C.W. e sintonia por um par de prismas de um laser de cor KCL:TLsup0 (1)." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10367.

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IPEN/D
Instituto de Fisica, Universidade de Sao Paulo - IF/USP
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4

Felgen, Nina [Verfasser]. "Investigation of diamond nanostructures with incorporated color centers / Nina Felgen." Kassel : Universitätsbibliothek Kassel, 2019. http://d-nb.info/1182471285/34.

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Pham, Linh My. "Magnetic Field Sensing with Nitrogen-Vacancy Color Centers in Diamond." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10993.

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In recent years, the nitrogen-vacancy (NV) center has emerged as a promising magnetic sensor capable of measuring magnetic fields with high sensitivity and spatial resolution under ambient conditions. This combination of characteristics allows NV magnetometers to probe magnetic structures and systems that were previously inaccessible with alternative magnetic sensing technologies. This dissertation presents and discusses a number of the initial efforts to demonstrate and improve NV magnetometry. In particular, a wide-field CCD based NV magnetic field imager capable of micron-scale spatial resolution is demonstrated; and magnetic field alignment, preferential NV orientation, and multipulse dynamical decoupling techniques are explored for enhancing magnetic sensitivity. The further application of dynamical decoupling control sequences as a spectral probe to extract information about the dynamics of the NV spin environment is also discussed; such information may be useful for determining optimal diamond sample parameters for different applications. Finally, several proposed and recently demonstrated applications which take advantage of NV magnetometers' sensitivity and spatial resolution at room temperature are presented, with particular focus on bio-magnetic field imaging.
Engineering and Applied Sciences
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6

Balasubramanian, Priyadharshini [Verfasser]. "Towards quantum technologies with color centers in diamond / Priyadharshini Balasubramanian." Ulm : Universität Ulm, 2021. http://d-nb.info/1237750776/34.

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Babinec, Thomas Michael. "Topics in Nanophotonic Devices for Nitrogen-Vacancy Color Centers in Diamond." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10461.

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Recently, developments in novel and high-purity materials allow for the presence of a single, solitary crystalline defect to define the electronic, magnetic, and optical functionality of a device. The discrete nature of the active dopant, whose properties are defined by a quantum mechanical description of its structure, enables radically new quantum investigations and applications in these arenas. Finally,there has been significant development in large-scale device engineering due to mature semiconductor manufacturing techniques. The diverse set of photonic device architectures offering light confinement, guiding, and extraction is a prime example. These three paradigms – solitary dopant photonics and optoelectronics (solotronics), quantum science and technology, and device engineering – merge in the development of novel quantum photonic devices for the next generation of information processing systems. We present in this thesis a series of investigations of optical nanostructures for single optically active spins in single crystal diamond. Chapter 1 introduces the Nitrogen-Vacancy (NV) color center, summarizes its applications, and motivates the need for their integration into photonic structures. Chapter 2 describes two prototype nanobeam photonic crystal cavities for generating strong light-matter interactions with NV centers. The first device consists of a silicon nitride photonic crystal nanobeam cavity with high quality factor \(Q \sim 10^5\) and small mode volume \(V \sim 0.5*(\lambda/n)^3\). The second device consists of a monolithic diamond nanobeam cavity fabricated with the focused ion beam (FIB) directly in a single crystal diamond sample. Chapter 3 presents a high-efficiency source of single photons consisting of a single NV center in a photonic diamond nanowire. Early FIB prototypes are described, as is the first successful realization of the device achieved via reactive ion etching nanowires in a single crystal diamond containing NV centers, and finally a variation of this approach based on incorporation of NV centers in pure diamond via ion implantation. In chapter 4 we consider the optimal design of photonic devices offering both collection efficiency and cavity-enhancements and extend the model of the NV center to include photonic effects. In chapter 5 we briefly introduce a novel optically active spin discovered in a diamond nanowire. Finally, in chapter 6 we conclude with several proposals to extend this research program.
Engineering and Applied Sciences
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Fernandez-Acebal, Pelayo [Verfasser]. "Hyperpolarization and sensing with color centers in diamond / Pelayo Fernandez-Acebal." Ulm : Universität Ulm, 2020. http://d-nb.info/1203211619/34.

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DeLong, Kenneth Wayne. "Two-photon absorption and color centers: Effects on all-optical switching." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185023.

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This dissertation explores the effects of two-photon absorption and color center induced absorption on all-optical switching devices. The amount of allowable two-photon absorption was quantified by the parameter T = 2βλ/n₂, where λ is the operating wavelength, β is the two-photon absorption coefficient, and n₂ is the nonlinear refractive index coefficient, the latter two being measured at λ. If the value of T exceeds unity, the operation of all-optical switching devices is in general degraded beyond usable regimes. This result was demonstrated by numerical experiments on systems of equations modelling a nonlinear directional coupler, a prototypical all-optical switching device. The value of T was measured in two fibers, one made of lead silicate glass, and one made of TiO₂-doped silica. We find the value of T to be greater than unity at a wavelength of 1.06 μm in both fibers. Significant color center formation was seen in the lead glass fiber. These color centers were created through two-photon absorption and destroyed through one-photon absorption. Color center induced absorption was seen to mimic two-photon absorption in certain regimes. The nonlinear optical response of semiconductor-doped glasses, an example of a one-photon resonant nonlinearity, was studied. A relaxation time which is dependent on the carrier density was found to be important when modelling the response of these glasses.
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UDO, PAULO T. "Desenvolvimento de um laser de centros de cor-centros F2 em LiF." reponame:Repositório Institucional do IPEN, 1986. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9865.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Books on the topic "Color centers"

1

Georgiev, Mladen. F' centers in alkali halides. Berlin: Springer-Verlag, 1988.

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Basiev, T. T. Room temperature tunable color center lasers. Chur, Switzerland: Harwood Academic Publishers, 1994.

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Inc, NuStats, and National Endowment for the Arts., eds. Cultural centers of color: Report on a national survey. Washington, D.C: National Endowment for the Arts, 1993.

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N, Sheftalʹ N., T͡S︡uranov A. P, and Smirnov I. A, eds. Vkhozhdenie primesnykh t͡s︡entrov v kristallicheskiĭ sloĭ poluprovodnika: Prot͡s︡essy obrazovanii͡a︡ monokristallicheskikh sloev dli͡a︡ mikroėlektroniki. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1986.

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Brekhovskikh, S. M. Radiat͡s︡ionnye t͡s︡entry v neorganicheskikh steklakh. Moskva: Ėnergoatomizdat, 1988.

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D, Galanin M., ed. T͡S︡entry svechenii͡a︡ redkozemelʹnykh ionov v kristallofosforakh. Moskva: "Nauka", 1986.

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Teichmann, Jürgen. Zur Geschichte der Festkörperphysik: Farbzentrenforschung bis 1940. Stuttgart: F. Steiner Verlag Wiesbaden, 1988.

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Krasilʹshchikova, O. A. Okraska i li͡u︡minest͡s︡ent͡s︡ii͡a︡ prirodnogo fli͡u︡orita. Kiev: Nauk. dumka, 1986.

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Litvin, M. A. Opticheskie spektry i okraska porodoobrazui͡u︡shchikh amfibolov. Kiev: Nauk. dumka, 1992.

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A, Radzhabov E., and Nepomni͡a︡shchikh A. I, eds. Spektroskopii͡a︡ kislorodnykh i vodorodnykh primesnykh t͡s︡entrov v shchelchno-galoidnykh kristallakh. Novosibirsk: "Nauka," Sibirskoe otd-nie, 1992.

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Book chapters on the topic "Color centers"

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Tilley, Richard J. D. "Color Centers." In Encyclopedia of Color Science and Technology, 1–9. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-3-642-27851-8_223-2.

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Tilley, Richard J. D. "Color Centers." In Encyclopedia of Color Science and Technology, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-642-27851-8_223-3.

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Tilley, Richard J. D. "Color Centers." In Encyclopedia of Color Science and Technology, 252–59. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4419-8071-7_223.

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Tilley, Richard J. D. "Color Centers." In Encyclopedia of Color Science and Technology, 307–15. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-89862-5_223.

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Henderson, Brian, and Kevin P. O'Donnell. "Laser spectroscopy of color centers." In Topics in Applied Physics, 123–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/3540501541_4.

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Baldacchini, G. "Relaxed Excited States of Color Centers." In Optical Properties of Excited States in Solids, 255–303. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3044-2_6.

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Baldacchini, G. "Radiative and Nonradiative Processes in Color Centers." In Advances in Nonradiative Processes in Solids, 219–59. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4757-4446-0_7.

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Murakami, Kenji, Keita Suzuki, Yoshiki Iwai, Masayuki Okuya, and Masaru Shimomura. "Color Control of the Mechanoluminescent Material Through a Combination of Color Centers." In Lecture Notes in Networks and Systems, 65–73. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36841-8_6.

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Henderson, B. "Optical Spectroscopy of Color Centers in Ionic Crystal." In Spectroscopy of Solid-State Laser-Type Materials, 109–39. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0899-7_3.

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Baldacchini, G. "Optical Nonlinearities of Color Centers in Alkali Halides." In NATO ASI Series, 395–413. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1190-2_11.

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Conference papers on the topic "Color centers"

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Hadden, J. P., Sam Bishop, Reza Hekmati, Daryl Beggs, Robert Taylor, Wolfgang W. Langbein, and Anthony J. Bennett. "Color centers in III-Nitrides." In Low-Dimensional Materials and Devices 2021, edited by Nobuhiko P. Kobayashi, A. Alec Talin, Albert V. Davydov, and M. Saif Islam. SPIE, 2021. http://dx.doi.org/10.1117/12.2595778.

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Skuja, Linards, Hideo Hosono, and Masahiro Hirano. "Laser-induced color centers in silica." In Laser-Induced Damage in Optical Materials: 2000, edited by Gregory J. Exarhos, Arthur H. Guenther, Mark R. Kozlowski, Keith L. Lewis, and M. J. Soileau. SPIE, 2001. http://dx.doi.org/10.1117/12.425020.

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Mierczyk, Zygmunt, Slawomir M. Kaczmarek, and Krzysztof Kopczynski. "Color centers inside crystallic active media." In Laser Technology: Fourth Symposium, edited by Wieslaw L. Wolinski, Zdzislaw Jankiewicz, Jerzy K. Gajda, and Bohdan K. Wolczak. SPIE, 1995. http://dx.doi.org/10.1117/12.203280.

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Martyshkin, Dmitri V., Jason G. Parker, Vladimir V. Fedorov, and Sergey B. Mirov. "Tunable distributed-feedback color center laser using stabilized F 2 +** color centers in LiF crystal." In Lasers and Applications in Science and Engineering, edited by Richard Scheps and Hanna J. Hoffman. SPIE, 2004. http://dx.doi.org/10.1117/12.529608.

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Bryukvina, L. I., N. A. Ivanov, and D. S. Glazunov. "Stabilization of U1-centers and laser color centers in LiF:OH crystals." In XVI INTERNATIONAL CONFERENCE ON LUMINESCENCE AND LASER PHYSICS DEVOTED TO THE 100TH ANNIVERSARY OF IRKUTSK STATE UNIVERSITY. Author(s), 2019. http://dx.doi.org/10.1063/1.5089836.

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Robertson, A. R. "Comparison of chromaticity discrimination ellipses." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.fc2.

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Ellipses representing the discrimination of small color differences in the CIE chromaticity diagram have been determined recently by several investigators using surface colors (paints and textiles). When the classical MacAdam ellipses are interpolated to the same color centers they are oriented in significantly different directions. The orientation of the ellipses determined by Wyszecki and Fielder, who, like MacAdam, used colored lights, agrees better with the surface-color results in most cases. The ellipses from the various surface-color studies agree well with each other in shape and orientation, but the relative sizes for different color centers do not agree.
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Radulaski, Marina. "Quantum nanophotonic hardware with integrated color centers." In Nonlinear Photonics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/np.2022.npw2g.3.

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Color center systems are the leading candidates for deterministic quantum sources, quantum repeaters, and other key devices for quantum information processing. Their integration with photonic devices is the direction toward high fidelity performance and scalability.
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Angervaks, Alexandr E., Aleksandr S. Shcheulin, and Aleksandr I. Ryskin. "Convertible holograms in CaF2crystals with color centers." In SPIE Optics + Optoelectronics, edited by Miroslav Hrabovský, John T. Sheridan, and Antonio Fimia-Gil. SPIE, 2013. http://dx.doi.org/10.1117/12.2017160.

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Abulikemu, Aizitiaili, Yuta Kainuma, Toshu An, and Muneaki Hase. "Second-harmonic generation by diamond color centers." In 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2021. http://dx.doi.org/10.1109/cleo/europe-eqec52157.2021.9542088.

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Luhmann, T., S. Pazzagna, and Jan Meijer. "Color centers with exceptional properties in diamond." In 2021 26th Microoptics Conference (MOC). IEEE, 2021. http://dx.doi.org/10.23919/moc52031.2021.9598151.

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Reports on the topic "Color centers"

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Van Bibber, Karl, and Don M. Alger. Modification of Color Centers by Electron Bombardment: Final Report CRADA No. TC-0460-93-A. Office of Scientific and Technical Information (OSTI), November 2000. http://dx.doi.org/10.2172/1410053.

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Van Bibber, K. Modification of Color Centers by Electron Bombardment: Final Report CRADA No. TC-0460-93-A. Office of Scientific and Technical Information (OSTI), November 2000. http://dx.doi.org/10.2172/790069.

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Letcher, Theodore, Kent Sparrow, and Sandra LeGrand. Establishing a series of dust event case studies for East Asia. Engineer Research and Development Center (U.S.), October 2023. http://dx.doi.org/10.21079/11681/47824.

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Dust aerosols have a wide range of effects on air quality, health, land-management decisions, aircraft operations, and sensor data interpretations. Therefore, the accurate simulation of dust plume initiation and transport is a priority for operational weather centers. Recent advancements have improved the performance of dust prediction models, but substantial capability gaps remain when forecasting the specific location and timing of individual dust events, especially extreme dust outbreaks. Operational weather forecasters and US Army Engineer Research and Development Center (ERDC) researchers established a series of reference case study events to enhance dust transport model evaluation. These reference case studies support research to improve modeled dust simulations, including efforts to increase simulation accuracy on when and where dust is lofted off the ground, dust aerosols transport, and dust-induced adverse air quality issues create hazardous conditions downstream. Here, we provide detailed assessments of four dust events for Central and East Asia. We describe the dust-event lifecycle from onset to end (or when dust transports beyond the area of interest) and the synoptic and mesoscale environ-mental conditions governing the process. Analyses of hourly reanalysis data, spaceborne lidar and aerosol optical depth retrievals, upper-air soundings, true-color satellite imagery, and dust-enhanced false-color imagery supplement the discussions.
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Basiev, Tasoltan T. Color Center Mockup Development and Testing. Fort Belvoir, VA: Defense Technical Information Center, March 2001. http://dx.doi.org/10.21236/ada387936.

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Bland, Jennifer, and Kimberly Smith. Recruitment and Retention: Pilot Solutions Designed by Teachers of Color (Phase I). Digital Promise, February 2023. http://dx.doi.org/10.51388/20.500.12265/168.

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This report profiles five public PreK-12 learning education agencies across the U.S. that participated in the Digital Promise Center for Inclusive Innovation Teacher of Color Recruitment and Retention cohort and utilized the Inclusive Innovation model to create and launch locally contextualized programs designed by teachers of color.
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Iloh, Ph.D., Constance. Recruitment and Retention: Impact of Pilot Solutions Designed by Teachers of Color Phase II Report. Digital Promise, May 2024. http://dx.doi.org/10.51388/20.500.12265/216.

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For the past three years, Digital Promise has embarked on an expansive and human-centered endeavor to empower school districts to cultivate context-relevant solutions to the teacher of color workforce disparities. Through Digital Promise’s Inclusive Innovation approach, teachers of color from various school districts were engaged to develop and implement meaningful solutions to address training, recruiting, and/or retaining teachers of color. This report explores how these co-constructed solutions were implemented, their impact, and the potential to scale these efforts to create sustainable change for teachers of color in the present and future.
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Burks, Thomas F., Victor Alchanatis, and Warren Dixon. Enhancement of Sensing Technologies for Selective Tree Fruit Identification and Targeting in Robotic Harvesting Systems. United States Department of Agriculture, October 2009. http://dx.doi.org/10.32747/2009.7591739.bard.

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The proposed project aims to enhance tree fruit identification and targeting for robotic harvesting through the selection of appropriate sensor technology, sensor fusion, and visual servo-control approaches. These technologies will be applicable for apple, orange and grapefruit harvest, although specific sensor wavelengths may vary. The primary challenges are fruit occlusion, light variability, peel color variation with maturity, range to target, and computational requirements of image processing algorithms. There are four major development tasks in original three-year proposed study. First, spectral characteristics in the VIS/NIR (0.4-1.0 micron) will be used in conjunction with thermal data to provide accurate and robust detection of fruit in the tree canopy. Hyper-spectral image pairs will be combined to provide automatic stereo matching for accurate 3D position. Secondly, VIS/NIR/FIR (0.4-15.0 micron) spectral sensor technology will be evaluated for potential in-field on-the-tree grading of surface defect, maturity and size for selective fruit harvest. Thirdly, new adaptive Lyapunov-basedHBVS (homography-based visual servo) methods to compensate for camera uncertainty, distortion effects, and provide range to target from a single camera will be developed, simulated, and implemented on a camera testbed to prove concept. HBVS methods coupled with imagespace navigation will be implemented to provide robust target tracking. And finally, harvesting test will be conducted on the developed technologies using the University of Florida harvesting manipulator test bed. During the course of the project it was determined that the second objective was overly ambitious for the project period and effort was directed toward the other objectives. The results reflect the synergistic efforts of the three principals. The USA team has focused on citrus based approaches while the Israeli counterpart has focused on apples. The USA team has improved visual servo control through the use of a statistical-based range estimate and homography. The results have been promising as long as the target is visible. In addition, the USA team has developed improved fruit detection algorithms that are robust under light variation and can localize fruit centers for partially occluded fruit. Additionally, algorithms have been developed to fuse thermal and visible spectrum image prior to segmentation in order to evaluate the potential improvements in fruit detection. Lastly, the USA team has developed a multispectral detection approach which demonstrated fruit detection levels above 90% of non-occluded fruit. The Israel team has focused on image registration and statistical based fruit detection with post-segmentation fusion. The results of all programs have shown significant progress with increased levels of fruit detection over prior art.
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Dunlop J., L. McLerran, D. Morrison, and R. Venugopalan. Proceedings of RIKEN BNL Research Center Workshop: Saturation, the Color Glass Condensate and the Glasma: What Have We Learned from RHIC? Office of Scientific and Technical Information (OSTI), May 2010. http://dx.doi.org/10.2172/1088183.

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Santana Rodríguez, Martha O., Lorena I. Mestra Vargas, Adriana David Hinestroza, Julio Benavides, and Lorena Aguayo Ulloa. Utilización de remanentes de batata de color naranja en la alimentación de cerdos mestizos en el Centro de Investigación Turipaná, Córdoba, Colombia. Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, 2016. http://dx.doi.org/10.21930/agrosavia.poster.2016.51.

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La batata (Ipomoea batatas L.) es un tubérculo de alto valor nutritivo, re ejado en la concentración de carotenos y vitaminas B y C. En un estudio preliminar desarrollado con la Asociación de productores Frulastinas, en el municipio de Corozal, se identi caron los clones en proceso de registro por Corpoica, como materiales con potencial para exportación, principalmente a Holanda, que exige batata de pulpa naranja, color uniforme, forma regular y peso unitario entre 100 y 450 g, no obstante, solo el 45 % cumplió con el requisito, generándose un excedente del 55 % de la producción, que se evaluó en fases de levante y ceba.
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Chriscoe, Mackenzie, Rowan Lockwood, Justin Tweet, and Vincent Santucci. Colonial National Historical Park: Paleontological resource inventory (public version). National Park Service, February 2022. http://dx.doi.org/10.36967/nrr-2291851.

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Colonial National Historical Park (COLO) in eastern Virginia was established for its historical significance, but significant paleontological resources are also found within its boundaries. The bluffs around Yorktown are composed of sedimentary rocks and deposits of the Yorktown Formation, a marine unit deposited approximately 4.9 to 2.8 million years ago. When the Yorktown Formation was being deposited, the shallow seas were populated by many species of invertebrates, vertebrates, and micro-organisms which have left body fossils and trace fossils behind. Corals, bryozoans, bivalves, gastropods, scaphopods, worms, crabs, ostracodes, echinoids, sharks, bony fishes, whales, and others were abundant. People have long known about the fossils of the Yorktown area. Beginning in the British colonial era, fossiliferous deposits were used to make lime and construct roads, while more consolidated intervals furnished building stone. Large shells were used as plates and dippers. Collection of specimens for study began in the late 17th century, before they were even recognized as fossils. The oldest image of a fossil from North America is of a typical Yorktown Formation shell now known as Chesapecten jeffersonius, probably collected from the Yorktown area and very likely from within what is now COLO. Fossil shells were observed by participants of the 1781 siege of Yorktown, and the landmark known as “Cornwallis Cave” is carved into rock made of shell fragments. Scientific description of Yorktown Formation fossils began in the early 19th century. At least 25 fossil species have been named from specimens known to have been discovered within COLO boundaries, and at least another 96 have been named from specimens potentially discovered within COLO, but with insufficient locality information to be certain. At least a dozen external repositories and probably many more have fossils collected from lands now within COLO, but again limited locality information makes it difficult to be sure. This paleontological resource inventory is the first of its kind for Colonial National Historical Park (COLO). Although COLO fossils have been studied as part of the Northeast Coastal Barrier Network (NCBN; Tweet et al. 2014) and, to a lesser extent, as part of a thematic inventory of caves (Santucci et al. 2001), the park had not received a comprehensive paleontological inventory before this report. This inventory allows for a deeper understanding of the park’s paleontological resources and compiles information from historical papers as well as recently completed field work. In summer 2020, researchers went into the field and collected eight bulk samples from three different localities within COLO. These samples will be added to COLO’s museum collections, making their overall collection more robust. In the future, these samples may be used for educational purposes, both for the general public and for employees of the park.
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