Se connecter

Bibliographies thématiques / Light Raman effect / Articles de revues

Pour voir les autres types de publications sur ce sujet consultez le lien suivant : Light Raman effect.

Articles de revues sur le sujet « Light Raman effect »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 2 février 2022

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les 50 meilleurs articles de revues pour votre recherche sur le sujet « Light Raman effect ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Parcourez les articles de revues sur diverses disciplines et organisez correctement votre bibliographie.

1

Li, Ning, Da Peng Wang, Ai Mei Yan, Ying Xin Xie, and Feng Yu Wang. "Effect of Raman Slow Light on Distributed Raman Fiber Sensors." Applied Mechanics and Materials 303-306 (February 2013): 74–77. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.74.

Texte intégral

Résumé :

The effects of Raman slow-light on room-temperature single-mode optical fiber sensors are examined by extracting the Raman pulse-delay terms from extended nonlinear Schrodinger equation (NLSE). Numerical study shows that pulse parameters such as pulse position, frequency chirp, and envelope distortion may be greatly affected by slow light. We demonstrate a method based on pump power adjustment for compensating the slow light induced impairment.

Styles APA, Harvard, Vancouver, ISO, etc.

2

Liu, Z. J., B. Li, X. Y. Hu, et al. "The light diffraction effect on stimulated Raman scattering." Physics of Plasmas 23, no. 2 (2016): 022705. http://dx.doi.org/10.1063/1.4941967.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

3

Li, Wu Sen, Wen Jian Chen, and Mu Chun Zhou. "The Spectral Gain Characteristics of Optical Fiber Weak Light Pre-Amplifier Based on Raman Effect." Advanced Materials Research 774-776 (September 2013): 1714–18. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1714.

Texte intégral

Résumé :

The spectral information of weak light will be lost in the process of amplification based on photoelectric conversion. To solve this problem, multi-wavelength optical fiber Raman amplifier is used to pre-amplify the weak light before an ordinary color photoelectric sensor. The Raman gains and their effect factors were modeled and analyzed. The results show high intensity gains can be obtained for red, green and blue components of the weak light simultaneously .

Styles APA, Harvard, Vancouver, ISO, etc.

4

Fazio, Barbara, and Alessia Irrera. "Coherence of Raman light arises from disorder." Bullettin of the Gioenia Academy of Natural Sciences of Catania 52, no. 382 (2019): MISC1—MISC3. http://dx.doi.org/10.35352/gioenia.v52i382.75.

Texte intégral

Résumé :

Light propagation in random materials is a topic of great interest for the scientific community, not only for the possible relevant applications in the fields of photonics and renewable energies but even more since it allows to unveil new fascinating phenomena related to wave physics. Among these physical events, the most robust and always surviving any ensemble average is the coherent backscattering of light (CBS). It is a very subtle interference effect in disordered scattering media (such as semiconductor powders or micro-particle suspensions like milk or fog), in which wave coherence is pr

Styles APA, Harvard, Vancouver, ISO, etc.

5

Takele, Wassie Mersha, Lukasz Piatkowski, Frank Wackenhut, Sylwester Gawinkowski, Alfred J. Meixner, and Jacek Waluk. "Scouting for strong light–matter coupling signatures in Raman spectra." Physical Chemistry Chemical Physics 23, no. 31 (2021): 16837–46. http://dx.doi.org/10.1039/d1cp01863a.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

6

KUWAHARA, K., E. TAKAHASHI, Y. MATSUMOTO, and Y. OWADANO. "Compression of high-power KrF laser pulse by backward Raman scattering using focused geometry." Laser and Particle Beams 17, no. 2 (1999): 275–80. http://dx.doi.org/10.1017/s0263034699172124.

Texte intégral

Résumé :

We are working on the generation of the high-power UV pulse by backward Raman pulse amplification. This report deals with the generation of the high-power backward first Stokes light using a simple focusing geometry. The high-power Stokes light, which grows from spontaneous scattered light in the focal region, can be obtained by focusing the high-energy KrF pump pulse into a Raman cell filled with methane gas. The intensity of the pump pulse increases significantly near the focus. This pulse produces a serious effect of the nonlinear refractive index. We mixed xenon gas into the Raman medium t

Styles APA, Harvard, Vancouver, ISO, etc.

7

Trujillo Villanueva, Luis Eduardo, Felipe Legorreta García, Fidel Pérez Moreno, Marius Ramírez Cardona, and Edgar Arturo Chávez Urbiola. "Ultraviolet Light Effects on Cobalt–Thiourea Complexes Crystallization." Crystals 11, no. 5 (2021): 473. http://dx.doi.org/10.3390/cryst11050473.

Texte intégral

Résumé :

In this work, a cobalt–thiourea complexes crystal synthesis was carried out comparatively with and without ultraviolet light assistance (λ = 253 nm), and its effect was studied. Through the solvent evaporation technique, crystalline forms were obtained, which were analyzed and characterized by different techniques: Raman spectroscopy, X-ray diffraction (XRD), and digital optical microscopy. Crystal’s shape changes were observed when comparing those obtained from the solution with and without ultraviolet (UV) assistance. It was found that the UV light effect on the crystals causes a structural

Styles APA, Harvard, Vancouver, ISO, etc.

8

Paesler, M. A., H. D. Hallen, B. I. Yakobson, C. J. Jahncke, P. O. Boykin, and A. Meixner. "Near-Field Optical Spectroscopy: Enhancing the Light Budget." Microscopy and Microanalysis 3, S2 (1997): 815–16. http://dx.doi.org/10.1017/s1431927600010965.

Texte intégral

Résumé :

The near-field scanning optical microscope, or NSOM, provides spectroscopists with resolution beneath the diffraction limit. In the NSOM, an optical aperture smaller than the wavelength λ of the probe radiation is scanned in the near-field of a sample. Pixels are serially gathered and then constituted as a computer-generated image. Spectroscopic NSOM investigations demonstrating sub-λ, resolution include studies of photoluminescence, Raman spectroscopy, and single molecule fluorescence. Results of nano-Raman spectroscopy on semiconducting Rb-doped KTP are shown in figure 1. Figure la is a topo

Styles APA, Harvard, Vancouver, ISO, etc.

9

QIN Zhe, 秦哲, 王剑 WANG Jian, and 张存洲 ZHANG Cun-zhou. "Raman Spectra Study of Thermal Effect of Polymer Light-Emitting Diodes." ACTA PHOTONICA SINICA 42, no. 4 (2013): 392–96. http://dx.doi.org/10.3788/gzxb20134204.0392.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

10

Saha, Anushree, Rajan Arora, Vladislav V. Yakovlev, and Janice M. Burke. "Raman microspectroscopy of melanosomes: the effect of long term light irradiation." Journal of Biophotonics 4, no. 11-12 (2011): 805–13. http://dx.doi.org/10.1002/jbio.201100008.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

11

Huang, Frank K. "Micro-Raman Spectroscopy In The Characterization Of Biomedical Materials." Microscopy and Microanalysis 5, S2 (1999): 50–51. http://dx.doi.org/10.1017/s143192760001357x.

Texte intégral

Résumé :

Summaryμ-Raman spectroscopy has been used to characterize two types of biomedical materials: a multilayer, silicone elastomer used in implants, and a thin, polyethylene layer used in a medical device. Raman spectroscopy is the collection of light inelastically scattered by a material or compound. The technique is based on the Raman effect, which involves the interaction of light and matter. When light strikes a material, the light is inelastically scattered and is frequency shifted according to the vibrations of the chemical-functional groups and/or macrostructure of the material. The result i

Styles APA, Harvard, Vancouver, ISO, etc.

12

Mallik, D. C. V. "The Raman effect and Krishnan's diary." Notes and Records of the Royal Society of London 54, no. 1 (2000): 67–83. http://dx.doi.org/10.1098/rsnr.2000.0097.

Texte intégral

Résumé :

K.S. Krishnan, F.R.S. (1898–1961) is one of the most distinguished Indian scientists of this century. His collaboration with Sir C.V. Raman on the scattering of light by liquids--a collaboration which Raman described as ‘a partnership in scientific research of the Bowen-Millikan type’—led to the discovery of the effect that bears Raman's name. Krishnan recorded the events leading to this discovery in the form of a diary, extracts from which have often appeared in the past, although the diary itself has never been published before. Later, as a Reader in Physics at the University of Dacca and th

Styles APA, Harvard, Vancouver, ISO, etc.

13

MALOMED, BORIS A., and RICHARD S. TASGAL. "THE RAMAN EFFECT AND SOLITONS IN AN ELLIPTICAL OPTICAL FIBER." Journal of Nonlinear Optical Physics & Materials 05, no. 03 (1996): 559–74. http://dx.doi.org/10.1142/s0218863596000386.

Texte intégral

Résumé :

We derive a general system of coupled nonlinear Schrödinger equations, describing light in a bimodal optical fiber, taking into account the quasi-instantaneous Raman effect, group-velocity birefringence, phase-velocity birefringence, and optical activity, and for light with general ellipticity. The Raman coefficients prove to obey a relation which depends on the ellipticity. When group-velocity birefringence and optical activity are both non-zero, polarization couples to the changing frequency, so soliton polarization cannot be held constant in this case. Without optical activity, there are so

Styles APA, Harvard, Vancouver, ISO, etc.

14

Adar, Fran, Roussel Bernard, Alian Wang, Shari Hawi, and Kasem Nithipathikom. "Confocal Raman Line-Scanned Imaging of Complex Geological and Histological Thin Sections." Microscopy and Microanalysis 3, S2 (1997): 817–18. http://dx.doi.org/10.1017/s1431927600010977.

Texte intégral

Résumé :

Chemical imaging of complex multi-component materials has important potential for the analyst in many fields of research. Raman imaging is of particular interest for several reasons. The Raman spectra contain detailed information on chemical species and crystalline phase. Because the Raman effect is excited by optical radiation, the spatial resolution, which is proportional to the wavelength of the light, is better than 1 μm. and with near field optical techniques currently under development, there is potential for even higher spatial resolution in the chemical image.The methods used to produc

Styles APA, Harvard, Vancouver, ISO, etc.

15

Иванов, С. К., та А. М. Камчатнов. "Эволюция интенсивных световых импульсов в нелинейной среде с учетом эффекта Рамана". Журнал технической физики 127, № 7 (2019): 101. http://dx.doi.org/10.21883/os.2019.07.47936.87-19.

Texte intégral

Résumé :

AbstractThe evolution of high-intensity light pulses in nonlinear single-mode optical waveguides, the dynamics of light in which is described by the nonlinear Schrödinger equation with a Raman term taking into account stimulated Raman self-scattering of light, is investigated. It is demonstrated that dispersive shock waves the behavior of which is much more diverse than in the case of ordinary nonlinear Schrödinger equation with a Kerr nonlinearity are formed in the process of evolution of pulses of substantially high intensity. The Whitham equations describing slow evolution of the dispersive

Styles APA, Harvard, Vancouver, ISO, etc.

16

Qiu, Xuejun, Hanchuan Huang, Zhitong Huang, Zhengfei Zhuang, Zhouyi Guo, and Songhao Liu. "Effect of Red Light-Emitting Diodes Irradiation on Hemoglobin for Potential Hypertension Treatment Based on Confocal Micro-Raman Spectroscopy." Scanning 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/5067867.

Texte intégral

Résumé :

Red light-emitting diodes (LED) were used to irradiate the isolated hypertension hemoglobin (Hb) and Raman spectra difference was recorded using confocal micro-Raman spectroscopy. Differences were observed between the controlled and irradiated Hb by comparing the spectra records. The Raman spectrum at the 1399 cm−1 band decreased following prolonged LED irradiation. The intensity of the 1639 cm−1 band decreased dramatically in the first five minutes and then gradually increased in a time-dependent manner. This observation indicated that LED irradiation increased the ability of oxygen binding i

Styles APA, Harvard, Vancouver, ISO, etc.

17

Klenerman, D., D. L. Gerrard, H. Herman, and M. T. MacPherson. "Optically heterodyned Raman-induced Kerr-effect spectroscopy using a white-light continuum." Chemical Physics Letters 168, no. 6 (1990): 579–83. http://dx.doi.org/10.1016/0009-2614(90)85675-3.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

18

Cetinel, A., N. Artunç, G. Sahin, and E. Tarhan. "Influence of applied current density on the nanostructural and light emitting properties of n-type porous silicon." International Journal of Modern Physics B 29, no. 15 (2015): 1550093. http://dx.doi.org/10.1142/s0217979215500939.

Texte intégral

Résumé :

Effects of current density on nanostructure and light emitting properties of porous silicon (PS) samples were investigated by field emission scanning electron microscope (FE-SEM), gravimetric method, Raman and photoluminescence (PL) spectroscopy. FE-SEM images have shown that below 60 mA/cm 2, macropore and mesopore arrays, exhibiting rough morphology, are formed together, whose pore diameter, pore depth and porosity are about 265–760 nm, 58–63 μ m and 44–61%, respectively. However, PS samples prepared above 60 mA/cm 2 display smooth and straight macropore arrays, with pore diameter ranging fr

Styles APA, Harvard, Vancouver, ISO, etc.

19

Sun, Xiu Ping, and Zai Chao Yu. "Study on Raman Spectra of Zinc Gluconate under Effect of Different Solvent." Key Engineering Materials 552 (May 2013): 111–14. http://dx.doi.org/10.4028/www.scientific.net/kem.552.111.

Texte intégral

Résumé :

Raman spectrum is a kind of characteristic spectrum. The information of molecular vibration and rotation can be obtained by studying Raman spectrum. Raman spectrum will be changed because of molecular interaction under effect of different solvent. We selected zinc gluconate as the object of research. Zinc gluconate is dissolved respectively in ethyl chloride, benzene, ring of ethane，chloroform, acetic acid, ethylene oxide, n-propanol, n-butanol solution, and Raman spectra were tested. The change of molecular internal structure and the interaction of molecular functional groups are studied by m

Styles APA, Harvard, Vancouver, ISO, etc.

20

Foura, Ghania, Ahcène Soualah, and Didier Robert. "Effect of W doping level on TiO2 on the photocatalytic degradation of Diuron." Water Science and Technology 75, no. 1 (2016): 20–27. http://dx.doi.org/10.2166/wst.2016.472.

Texte intégral

Résumé :

In the present study, three compositions of W-doped titania nano-photocatalyst are synthesized via the sol–gel method. The powders obtained were characterized by X-ray diffraction, Raman spectroscopy and UV–visible diffuse reflectance spectroscopy. The photocatalytic performances of the different photocatalysts are tested with respect to the degradation of Diuron in water solutions under simulated solar light and visible light irradiation. The W0.03Ti0.97O2 catalyst exhibits better photoactivity than the pure TiO2 even under simulated solar light and visible light. This improvement in activity

Styles APA, Harvard, Vancouver, ISO, etc.

21

BARR, H. C., T. J. M. BOYD, and A. V. LUKYANOV. "Raman gain against a background of non-thermal ion fluctuations in a plasma." Journal of Plasma Physics 64, no. 5 (2000): 623–30. http://dx.doi.org/10.1017/s0022377800008837.

Texte intégral

Résumé :

A complex stimulated Raman scattering event against a background of non-thermal ion acoustic waves in an inhomogeneous plasma is described. We obtain analytic forms for the Raman gain due to a five-wave interaction consisting of conventional three-wave Raman scattering followed by the decay of the Raman Langmuir wave into a second Langmuir wave (or a second scattered light wave) and an ion acoustic wave. Very modest levels of ion waves produce a significant effect on Raman convective gain. A combination of plasma inhomogeneity and suprathermal ion fluctuations may offer a means for the control

Styles APA, Harvard, Vancouver, ISO, etc.

22

Wagner, T., S. Beirle, and T. Deutschmann. "A new method for the simulation of the Ring effect in observations of scattered sun light." Atmospheric Measurement Techniques Discussions 2, no. 1 (2009): 87–118. http://dx.doi.org/10.5194/amtd-2-87-2009.

Texte intégral

Résumé :

Abstract. We present a new technique for the quantitative simulation of the "Ring effect" for scattered light observations from various platforms and under different atmospheric situations. The method is based on radiative transfer calculations at only one wavelength λ0 in the wavelength range under consideration, and is thus computationally fast. The strength of the Ring effect is calculated from statistical properties of the photon paths for a given situation, which makes Monte Carlo radiative transfer models in particular appropriate. We quantify the Ring effect by the so called rotational

Styles APA, Harvard, Vancouver, ISO, etc.

23

Sato, Hidetoshi, Satoshi Wada, and Hideo Tashiro. "Fluorescence Backgroundless Ti: Sapphire Laser Using Acousto-Optical Tunable Filter for Raman Spectroscopic Measurements." Applied Spectroscopy 56, no. 10 (2002): 1303–7. http://dx.doi.org/10.1366/000370202760355019.

Texte intégral

Résumé :

The background noise inherent to tunable lasers, which emit broad band spontaneous fluorescence from the laser-active medium, is detrimental for sensitive Raman measurement. Using the diffraction effect in an acousto-optic device, we have developed a fluorescence backgroundless Ti: sapphire laser suited for near-infrared Raman spectroscopy. A Raman excitation profile consisting of series of Raman spectra of deoxygenated hemoglobin aqueous solutions was measured by changing excitation wavelengths, revealing the high potential of this laser as a spectroscopic light source.

Styles APA, Harvard, Vancouver, ISO, etc.

24

Huang, Chien Wen, Yao Wu Hao, James Nyagilo, Digant P. Dave, Li Feng Xu, and Xian Kai Sun. "Porous Hollow Gold Nanoparticles for Cancer SERS Imaging." Journal of Nano Research 10 (April 2010): 137–48. http://dx.doi.org/10.4028/www.scientific.net/jnanor.10.137.

Texte intégral

Résumé :

Surface enhanced Raman spectroscopy (SERS) is a promising molecular imaging modality capable of simultaneously detecting multiple molecular biomarkers. With the biocompatibility and functionalizability of Au, Au-nanoparticle based Raman tags possess the potential for in vivo SERS cancer biomarker detection. Here, we report the large scale synthesis of a new type of Au nanoparticles, Porous Hollow Au Nanoparticles (PHAuNPs), and demonstrate their potential application as SERS imaging tags. PHAuNPs feature a sub-20 nm porous shell and a 50 nm void core. Such unique morphology enables them to str

Styles APA, Harvard, Vancouver, ISO, etc.

25

Ji, Jianting, Anmin Zhang, Jiahe Fan, et al. "Giant magneto-optical Raman effect in a layered transition metal compound." Proceedings of the National Academy of Sciences 113, no. 9 (2016): 2349–53. http://dx.doi.org/10.1073/pnas.1601010113.

Texte intégral

Résumé :

We report a dramatic change in the intensity of a Raman mode with applied magnetic field, displaying a gigantic magneto-optical effect. Using the nonmagnetic layered material MoS2 as a prototype system, we demonstrate that the application of a magnetic field perpendicular to the layers produces a dramatic change in intensity for the out-of-plane vibrations of S atoms, but no change for the in-plane breathing mode. The distinct intensity variation between these two modes results from the effect of field-induced broken symmetry on Raman scattering cross-section. A quantitative analysis on the fi

Styles APA, Harvard, Vancouver, ISO, etc.

26

Boyd, T. J. M., G. A. Gardner, and G. A. Coutts. "Some Anomalies in the Raman spectrum from laser-produced plasmas." Laser and Particle Beams 6, no. 2 (1988): 287–94. http://dx.doi.org/10.1017/s0263034600004031.

Texte intégral

Résumé :

Many experiments show features of the Raman spectrum at variance with the predictions of conventional theory. One persistent discrepancy, the cut-off in the spectrum of scattered light at about 1·5λ0, led Simon and Short to postulate that the scattered spectrum is not Raman light as such, but derives from enhanced Thomson scattering from plasmas in which a population of suprathermal electrons is present. We describe a set of simulations which model the propagation of a light wave through a plasma characterized by two electron temperatures with the hot electron fraction varying between 0 and 0·

Styles APA, Harvard, Vancouver, ISO, etc.

27

Tfaili, Sana, Gwendal Josse, Cyril Gobinet, Jean-François Angiboust, Michel Manfait, and Olivier Piot. "Shedding light on the laser wavelength effect in Raman analysis of skin epidermises." Analyst 137, no. 18 (2012): 4241. http://dx.doi.org/10.1039/c2an16115j.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

28

Arjyal, Bish, and Costas Galiotis. "Localised Stress Measurements in Composite Laminates Using a Raman Stress Sensor." Advanced Composites Letters 4, no. 2 (1995): 096369359500400. http://dx.doi.org/10.1177/096369359500400203.

Texte intégral

Résumé :

A new remote laser Raman stress/ strain sensor for localised measurements in polymer based composites, has been developed and tested. Measurements can be conducted in reinforcing fibres near the surface of laminates. For measurements in the bulk of composites, the exciting laser light has to be transported to the reinforcing fibres via an embedded fibre optic cable. The backscattered light is transmitted through the same fibre optic and is sent to the Raman spectrometer for analysis. The effect of the direction of the fibre optic cable with respect to the axis of the reinforcing fibres is exam

Styles APA, Harvard, Vancouver, ISO, etc.

29

Bremard, C., P. Dhamelincourt, J. Laureyns, and G. Turrell. "The Effect of High-Numerical-Aperture Objectives on Polarization Measurements in Micro-Raman Spectrometry." Applied Spectroscopy 39, no. 6 (1985): 1036–39. http://dx.doi.org/10.1366/0003702854249754.

Texte intégral

Résumé :

Polarized Raman spectra of the reference materials carbon tetrachloride and α-quartz are obtained with the Raman microprobe MOLE with the use of different high-numerical-aperture objectives. The depolarization ratios of the Raman bands of isotropic samples are in good agreement with those obtained with the use of conventional instruments, provided that the reflection or transmission factor of the beamsplitter is introduced as a correction. Even with the very wide-aperture objectives used, the depolarization effect is not large and can be evaluated theoretically. Correct polarized spectra of an

Styles APA, Harvard, Vancouver, ISO, etc.

30

Liu, Zhen, Kai Guo, Guangwei Hu, et al. "Observation of nonreciprocal magnetophonon effect in nonencapsulated few-layered CrI3." Science Advances 6, no. 43 (2020): eabc7628. http://dx.doi.org/10.1126/sciadv.abc7628.

Texte intégral

Résumé :

“Magneto-optical” effect refers to a rotation of polarization plane, which has been widely studied in traditional ferromagnetic metal and insulator films and scarcely in two-dimensional layered materials. Here, we uncover a new nonreciprocal magnetophonon Raman scattering effect in ferromagnetic few-layer CrI3. We observed a rotation of the polarization plane of inelastically scattered light between −20o and +60o that are tunable by an out-of-plane magnetic field from −2.5 to 2.5 T. It is experimentally observed that the degree of polarization can be magnetically manipulated between −20 and 85

Styles APA, Harvard, Vancouver, ISO, etc.

31

DAS, A., B. CHAKRABORTY, and A. K. SOOD. "PROBING SINGLE AND BILAYER GRAPHENE FIELD EFFECT TRANSISTORS BY RAMAN SPECTROSCOPY." Modern Physics Letters B 25, no. 08 (2011): 511–35. http://dx.doi.org/10.1142/s0217984911025973.

Texte intégral

Résumé :

This article is a review of our work related to Raman studies of single layer and bilayer graphenes as a function Fermi level shift achieved by electrochemically top gating a field effect transistor. Combining the transport and in situ Raman studies of the field effect devices, a quantitative understanding is obtained of the phonon renormalization due to doping of graphene. Results are discussed in the light of time dependent perturbation theory, with electron phonon coupling parameter as an input from the density functional theory. It is seen that phonons near Γ and K points of the Brillouin

Styles APA, Harvard, Vancouver, ISO, etc.

32

Zannotti, Marco, Andrea Rossi, and Rita Giovannetti. "SERS Activity of Silver Nanosphere, Triangular Nanoplates, Hexagonal Nanoplates and Quasi-Spherical Nanoparticles: Effect of Shape and Morphology." Coatings 10, no. 3 (2020): 288. http://dx.doi.org/10.3390/coatings10030288.

Texte intégral

Résumé :

In this work, we prepared different morphologies of silver nanoparticles: nanosphere, triangular nanoplates, hexagonal nanoplates, and quasi-spherical shapes, through one-step synthesis. Hydrogen peroxide was used as the oxidizing agent during the reduction of silver nitrate by sodium borohydride, in the presence of tri-sodium citrate and poly-vinyl-pyrrolidone. The obtained silver nanoparticles were fully characterized by UV-Vis spectroscopy, Dynamic Light Scattering and Scanning Electron Microscopy, and successfully used as Surface Enhanced Raman Scattering (SERS) substrates. The effect of s

Styles APA, Harvard, Vancouver, ISO, etc.

33

Prabha, S., V. L. Chandraboss, J. Kamalakannan, and S. Senthilvelan. "Activated Charcoal Supported Cadmium Doped TiO₂ for Photocatalytic and Antibacterial Applications." International Letters of Chemistry, Physics and Astronomy 44 (January 2015): 108–23. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.44.108.

Texte intégral

Résumé :

The photocatalytic activity was studied under UV light using AC-Cd/TiO2 prepared via precipitation method and characterized by powder X-ray diffraction (XRD) , high resolution scanning electron micrographs (HR-SEM) with energy dispersive X-ray analysis (EDX), photoluminescence (PL) and Fourier transform Raman analysis (FT-RAMAN). The enhanced photo catalytic activity of the AC-Cd/TiO2 is demonstrated through photodegradation of methylene blue under UV light radiation at 365 nm. The mechanism of photocatalytic effect of AC-Cd/TiO2 nanocomposite material has been discussed Further its antibacter

Styles APA, Harvard, Vancouver, ISO, etc.

34

YANG MIN, HUANG DA-MING, HAO PING-HAI, ZHANG FU-LONG, HOU XIAO-YUAN, and WANG XUN. "EFFECT OF PHONON CONFINEMENT AND STRAIN ON RAMAN SPECTRA FROM LIGHT-EMITTING POROUS SILICON." Acta Physica Sinica 43, no. 3 (1994): 494. http://dx.doi.org/10.7498/aps.43.494.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

35

Turner, Daniel B., and Darin J. Ulness. "Factorized time correlation diagram analysis of Raman induced Kerr effect spectroscopy using noisy light." Journal of Chemical Physics 119, no. 20 (2003): 10745–52. http://dx.doi.org/10.1063/1.1619932.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

36

Wagner, T., S. Beirle, and T. Deutschmann. "Three-dimensional simulation of the Ring effect in observations of scattered sun light using Monte Carlo radiative transfer models." Atmospheric Measurement Techniques 2, no. 1 (2009): 113–24. http://dx.doi.org/10.5194/amt-2-113-2009.

Texte intégral

Résumé :

Abstract. We present a new technique for the quantitative simulation of the "Ring effect" for scattered light observations from various platforms and under different atmospheric situations. The method is based on radiative transfer calculations at only one wavelength λ0 in the wavelength range under consideration, and is thus computationally fast. The strength of the Ring effect is calculated from statistical properties of the photon paths for a given situation, which makes Monte Carlo radiative transfer models in particular appropriate. We quantify the Ring effect by the so called rotational

Styles APA, Harvard, Vancouver, ISO, etc.

37

Adu, Kofi W., Martin D. Williams, Molly Reber, Ruwantha Jayasingha, Humberto R. Gutierrez, and Gamini U. Sumanasekera. "Probing Phonons in Nonpolar Semiconducting Nanowires with Raman Spectroscopy." Journal of Nanotechnology 2012 (2012): 1–18. http://dx.doi.org/10.1155/2012/264198.

Texte intégral

Résumé :

We present recent developments in Raman probe of confined optical and acoustic phonons in nonpolar semiconducting nanowires, with emphasis on Si and Ge. First, a review of the theoretical spatial correlation phenomenological model widely used to explain the downshift and asymmetric broadening to lower energies observed in the Raman profile is given. Second, we discuss the influence of local inhomogeneous laser heating and its interplay with phonon confinement on Si and Ge Raman line shape. Finally, acoustic phonon confinement, its effect on thermal conductivity, and factors that lead to phonon

Styles APA, Harvard, Vancouver, ISO, etc.

38

Yuan, Xiaofei, Yanqing Song, Yizhi Song, et al. "Effect of Laser Irradiation on Cell Function and Its Implications in Raman Spectroscopy." Applied and Environmental Microbiology 84, no. 8 (2018): e02508-17. http://dx.doi.org/10.1128/aem.02508-17.

Texte intégral

Résumé :

ABSTRACTLasers are instrumental in advanced bioimaging and Raman spectroscopy. However, they are also well known for their destructive effects on living organisms, leading to concerns about the adverse effects of laser technologies. To implement Raman spectroscopy for cell analysis and manipulation, such as Raman-activated cell sorting, it is crucial to identify nondestructive conditions for living cells. Here, we evaluated quantitatively the effect of 532-nm laser irradiation on bacterial cell fate and growth at the single-cell level. Using a purpose-built microfluidic platform, we were able

Styles APA, Harvard, Vancouver, ISO, etc.

39

Barbillon, Grégory. "Oxygen Vacancy Dynamics in Highly Crystalline Zinc Oxide Film Investigated by PIERS Effect." Materials 14, no. 16 (2021): 4423. http://dx.doi.org/10.3390/ma14164423.

Texte intégral

Résumé :

Surface-enhanced Raman spectroscopy (SERS) is commonly employed as an analysis or detection tool of biological and chemical molecules. Recently, an alternative section of the SERS field has appeared, called photo-induced enhanced Raman spectroscopy (PIERS). This PIERS effect is based on the production of the oxygen vacancies (V0) in metal-oxide semiconductor thin-film (or other structures) by irradiation with UV light, thus enabling a Raman signal enhancement of chemical molecules through charge transfer processes between this photo-irradiated semiconductor film (or other structures) and these

Styles APA, Harvard, Vancouver, ISO, etc.

40

Zhang, Chunling, Liying Zhang, Ru Yang, Kun Liang, and Dejun Han. "Time-Correlated Raman and Fluorescence Spectroscopy Based on a Silicon Photomultiplier and Time-Correlated Single Photon Counting Technique." Applied Spectroscopy 67, no. 2 (2013): 136–40. http://dx.doi.org/10.1366/12-06736.

Texte intégral

Résumé :

We report a time-correlated Raman spectroscopy technique based on a silicon photomultiplier (SiPM) and a time-correlated single photon counting (TCSPC) technique to exploit the natural temporal separation between Raman and fluorescence phenomena to alleviate the high fluorescence background with conventional Raman detection. The TCSPC technique employed can greatly reduce the effect of high dark count rate (DCR) and crosstalk of SiPM that seriously hinder its application in low light level detection. The operating principle and performance of the 400 ps time resolution system are discussed alo

Styles APA, Harvard, Vancouver, ISO, etc.

41

Chen, Shuo-Wei, Chia-Jui Chang, and Tien-Chang Lu. "Effect of Strains and V-Shaped Pit Structures on the Performance of GaN-Based Light-Emitting Diodes." Crystals 10, no. 4 (2020): 311. http://dx.doi.org/10.3390/cryst10040311.

Texte intégral

Résumé :

Strains and V-shaped pits are essential factors for determining the efficiency of GaN-based light-emitting diodes (LEDs). In this study, we systematically analyzed GaN LED structures on patterned sapphire substrates (PSSs) with two types of growth temperature employed for prestrained layers and three different thickness of n-type GaN layers by using cathodoluminescence (CL), microphotoluminescence (PL), and depth-resolved confocal Raman spectroscopy. The results indicated that V-pits formation situation can be analyzed using CL. From the emission peak intensity ratio of prestrained layers and

Styles APA, Harvard, Vancouver, ISO, etc.

42

Dorozhkin, P., E. Kuznetsov, A. Schokin, S. Timofeev, and V. Bykov. "AFM + Raman Microscopy + SNOM + Tip-Enhanced Raman: Instrumentation and Applications." Microscopy Today 18, no. 6 (2010): 28–32. http://dx.doi.org/10.1017/s1551929510000982.

Texte intégral

Résumé :

Atomic Force Microscopy (AFM) has developed into a very powerful tool for characterization of surfaces and nanoscale objects. Many physical properties of an object can be studied by AFM with nanometer-scale resolution. Local stiffness, elasticity, conductivity, capacitance, magnetization, surface potential and work function, friction, piezo response—these and many other physical properties can be studied with over 30 AFM modes. What is typically lacking in information provided by AFM studies is the chemical composition of the sample and information about its crystal structure. To obtain this i

Styles APA, Harvard, Vancouver, ISO, etc.

43

LABAUNE, C., H. A. BALDIS, B. S. BAUER, E. SCHIFANO, and A. MICHARD. "Effect of crossed beams irradiation on parametric instabilities." Laser and Particle Beams 17, no. 3 (1999): 451–57. http://dx.doi.org/10.1017/s0263034699173129.

Texte intégral

Résumé :

Modification of the growth of scattering processes in the case of multiple beam irradiation compared to single beam irradiation has been investigated in a preformed plasma using Thomson scattering of a short wavelength probe beam, and spectral and temporal analysis of reflected and transmitted light. First observations of the reduction of the amplitude of ion acoustic waves associated with simulated Brillouin scattering, amplification of the amplitude of electron plasma waves associated with stimulated Raman scattering, and transfer of energy between crossing beams with same frequency in a flo

Styles APA, Harvard, Vancouver, ISO, etc.

44

Lázaro, João Carlos, Marcos Tadeu T. Pacheco, Kátia Calligaris Rodrigues, et al. "Optimizing the Raman signal for characterizing organic samples: The effect of slit aperture and exposure time." Spectroscopy 23, no. 2 (2009): 71–80. http://dx.doi.org/10.1155/2009/764524.

Texte intégral

Résumé :

The present work is focused on the influence of the slit aperture and time exposure of the infrared light on the Charge Coupled Device (CCD) in relation to their physical effects, in order to improve the Raman spectrum characteristics. Indeed, the alterations in slit aperture and CCD time exposure affect significantly important spectral properties, such as the spectral intensity, Signal to Noise Ratio (SNR) and band width resolution of the Raman spectra. Therefore, the present proposal has the aim of to found the optimum conditions of instrumental arrangement, involving the minimum collection

Styles APA, Harvard, Vancouver, ISO, etc.

45

Weng, Cun-Cheng, and Xiao-Man Zhang. "Fluctuations of optical phase of diffracted light for Raman–Nath diffraction in acousto–optic effect." Chinese Physics B 24, no. 1 (2015): 014210. http://dx.doi.org/10.1088/1674-1056/24/1/014210.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

46

Nakayama, Atsuko, Suguru Hoshino, Yuh Yamada, Ayako Ohmura, and Fumihiro Ishikawa. "Counting graphene layers based on the light-shielding effect of Raman scattering from a substrate." Applied Physics Letters 107, no. 23 (2015): 231604. http://dx.doi.org/10.1063/1.4937140.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

47

Li, Zhipeng, and Hongxing Xu. "Nanoantenna effect of surface-enhanced Raman scattering: managing light with plasmons at the nanometer scale." Advances in Physics: X 1, no. 3 (2016): 492–521. http://dx.doi.org/10.1080/23746149.2016.1220263.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

48

Wijewardena Gamalath, K. A. I. L., and G. L. A. U. Jayawardena. "Diffraction of Light by Acoustic Waves in Liquids." International Letters of Chemistry, Physics and Astronomy 4 (September 2013): 39–57. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.4.39.

Texte intégral

Résumé :

For the acusto-optic interactions in liquids, an equation for the diffraction light intensity was obtained in terms of Klein Cook parameter Q. With optimized parameters for Q, incident light wave length of λ = 633 nm, sound wave length of Λ = 0.1 mm, acusto-optic interaction length L=0.1 m, and refractive index of the liquid in the range of 1 to 2, the existence of ideal Raman-Nath and Bragg diffractions were investigated in terms of phase delay and incident angle. The ideal Raman-Nath diffraction slightly deviated when the Klein Cook parameter was increased from 0 to 1 for low phase delay val

Styles APA, Harvard, Vancouver, ISO, etc.

49

Islam, Md Mahfujul, та Fredric Datchi. "Polarized Raman Spectra of α Quartz". International Letters of Chemistry, Physics and Astronomy 56 (липень 2015): 91–98. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.56.91.

Texte intégral

Résumé :

The purpose of this experiment was to observe the Raman shift to assign the symmetry character of the obtained vibrational modes of α-quartz (which has 9 atom per unit cell) using the selection rules for Raman Effect. We observed the Raman spectra varying the polarization of the incoming beam and the orientation of the crystal. And we used monochromatic radiation of argon laser of wavelength 540 nm for our Raman spectroscopy. We observed the intensity of light rotating the polarizer to vertical position from its horizontal position with respect to the plane of the optical table where the laser

Styles APA, Harvard, Vancouver, ISO, etc.

50

Phuruangrat, Anukorn, Sunisa Putdum, Phattranit Dumrongrojthanath, Somchai Thongtem, and Titipun Thongtem. "Hydrothermal Synthesis of Bi2MoO6 Visible-Light-Driven Photocatalyst." Journal of Nanomaterials 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/135735.

Texte intégral

Résumé :

Bismuth molybdate (Bi2MoO6) nanoplates were synthesized by the hydrothermal reaction of bismuth nitrate and sodium molybdate as starting materials at 120–180°C for 5–20 h. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and scanning electron microscopy (SEM) were used to investigate the effect of reaction temperature and length of reaction time on phase and morphologies of the as-synthesized Bi2MoO6 samples. In this research, orthorhombic well-crystallized Bi2MoO6 nanoplates with the presence of stretching and bending vibrations of MoO6 and BiO6 oct

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!