Relevant bibliographies by topics / Light intensity modulation

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

Academic literature on the topic 'Light intensity modulation'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Light intensity modulation"

1

Vaz, Aldrin Claytus. "Colour Light Intensity based Modulation Scheme for Visible Light Communication Employing Turbo Codes." Journal of Advanced Research in Dynamical and Control Systems 12, SP3 (February 28, 2020): 1051–60. http://dx.doi.org/10.5373/jardcs/v12sp3/20201351.

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Ping Hu, Ping Hu, Guangzhen Li Guangzhen Li, Juan Huo Juan Huo, Yuanlin Zheng Yuanlin Zheng, and and Xianfeng Chen and Xianfeng Chen. "Intensity modulation of light by light in a periodically poled MgO-doped lithium niobate crystal." Chinese Optics Letters 13, no. 12 (2015): 121902–6. http://dx.doi.org/10.3788/col201513.121902.

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Lukyanovich, P. A., B. A. Zon, A. A. Kunin, and S. N. Pankova. "Light intensity modulation in phototherapy." Laser Physics 25, no. 4 (February 26, 2015): 045602. http://dx.doi.org/10.1088/1054-660x/25/4/045602.

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Zhisheng, Yun, Li Yulin, Liu Jifang, and He Zhengquan. "Phase-only modulation with a spatial light modulator controlled by writing light intensity." Optics Communications 139, no. 4-6 (July 1997): 232–36. http://dx.doi.org/10.1016/s0030-4018(97)00053-9.

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Latychevskaia, Tatiana. "Wavefront Modulation and Beam Shaping into Arbitrary Three-Dimensional Intensity Distributions." Photonics 8, no. 6 (May 23, 2021): 179. http://dx.doi.org/10.3390/photonics8060179.

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In this study the methods of three-dimensional (3D) wavefront intensity modulation by employing contrast-inverted holography, previously introduced as Gabor inverted holography, are further investigated. The present study provides the recipes for creating 3D wavefront intensity modulations using phase-only and amplitude-only modulators and compares the results. The 3D wavefront modulation using spherical waves is also demonstrated, and the miniaturization of 3D intensity beams is discussed; it is shown that both the resolution and the size of the created 3D structures are ultimately given by the wavelength of the employed radiation. The manuscript also addresses the quality of the formed 3D intensity curves and determines the parameters that provide the best smooth appearance of the 3D curves. The presented methods of 3D intensity wavefront modulation can be realized for all kinds of waves: light, X-ray, electron, etc, provided the modulator can be manufactured for the corresponding wavelength. The methods of 3D intensity wavefront modulation can be applied in various techniques: lithography, micro-robotics, particle trapping, etc.
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Wu, Zi-Yang, Xiao-Yu Liu, Jiang-Shan Wang, and Jiao Wang. "Modulation index dependence of intensity modulation bandwidth in visible light communications." Optics Letters 43, no. 19 (September 17, 2018): 4570. http://dx.doi.org/10.1364/ol.43.004570.

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Celik, Yasin, and Aydin Akan. "Subcarrier intensity modulation for MIMO visible light communications." Optics Communications 412 (April 2018): 90–101. http://dx.doi.org/10.1016/j.optcom.2017.12.002.

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Ahn, Kang-Il, and Jae Kyun Kwon. "Color Intensity Modulation for Multicolored Visible Light Communications." IEEE Photonics Technology Letters 24, no. 24 (December 2012): 2254–57. http://dx.doi.org/10.1109/lpt.2012.2226570.

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Kwon, Il Bum, Chi Yeop Kim, Dong Jin Yoon, Jeong Min Seo, and Jung Ju Lee. "Multiplexing of FBG Sensor by Light Source Intensity Modulation." Key Engineering Materials 270-273 (August 2004): 2134–39. http://dx.doi.org/10.4028/www.scientific.net/kem.270-273.2134.

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Fu, Yili, Haiting Di, and Renqiang Liu. "Light intensity modulation fiber-optic sensor for curvature measurement." Optics & Laser Technology 42, no. 4 (June 2010): 594–99. http://dx.doi.org/10.1016/j.optlastec.2009.10.009.

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Dissertations / Theses on the topic "Light intensity modulation"

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Roth, Matthias, Jörg Heber, and Klaus Janschek. "System design of programmable 4f phase modulation techniques for rapid intensity shaping: A conceptual comparison." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35096.

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The present study analyses three beam shaping approaches with respect to a light-efficient generation of i) patterns and ii) multiple spots by means of a generic optical 4f-setup. 4f approaches share the property that due to the one-to-one relationship between output intensity and input phase, the need for time-consuming, iterative calculation can be avoided. The resulting low computational complexity offers a particular advantage compared to the widely used holographic principles and makes them potential candidates for real-time applications. The increasing availability of high-speed phase modulators, e.g. on the basis of MEMS, calls for an evaluation of the performances of these concepts. Our second interest is the applicability of 4f methods to high-power applications. We discuss the variants of 4f intensity shaping by phase modulation from a system-level point of view which requires the consideration of application relevant boundary conditions. The discussion includes i) the micro mirror based phase manipulation combined with amplitude masking in the Fourier plane, ii) the Generalized Phase Contrast, and iii) matched phase-only correlation filtering combined with GPC. The conceptual comparison relies on comparative figures of merit for energy efficiency, pattern homogeneity, pattern image quality, maximum output intensity and flexibility with respect to the displayable pattern. Numerical simulations illustrate our findings.
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Kreilkamp, Lars Erik [Verfasser], Ilya A. [Akademischer Betreuer] Akimov, and Heinz [Gutachter] Hövel. "Light intensity modulation in hybrid plasmonic crystals using propagating modes / Lars Erik Kreilkamp ; Gutachter: Heinz Hövel ; Betreuer: Ilya A. Akimov." Dortmund : Universitätsbibliothek Dortmund, 2016. http://d-nb.info/1119447860/34.

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Almora, Rodríguez Osbel. "Hysteresis and Capacitive Features of Perovskite Solar Cells." Doctoral thesis, Universitat Jaume I, 2020. http://hdl.handle.net/10803/669272.

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In the present work, anomalous distortions occurring in the current-voltage characteristic of perovskite solar cells (PSCs), usually called J-V curve hysteresis, are studied by several methods. This includes dynamic direct current (DC) mode J-V experiments and impedance spectroscopy (IS) analyses in dark and under illumination. The J-V curves of PSCs were measured under different conditions showing capacitive hysteretic currents. This is related with low frequency excess capacitance in the IS spectra. These two features are correlated with the response of mobile ions in space charge regions close to the interfaces. The large values of capacitance under illumination in the sub-Hz regime were explained in terms of mobile ions space charges and chemical capacitances assuming a proportionality between the number of ionized/activated mobile ions and the concentration of charge carriers and photon fluence.
En el presente trabajo se estudian por varios métodos las distorsiones anómalas en la característica de corriente-voltaje de las celdas solares de perovskita (PSC), típicamente llamada histéresis de J-V. Esto incluye experimentos dinámicos de J-V en modo de corriente continua (DC) y análisis de espectroscopía de impedancia (IS) en oscuridad y bajo iluminación. Las curvas J-V en oscuridad de las PSCs exhiben corrientes capacitivas, relacionadas con un exceso de capacitancia de baja frecuencia en los espectros de IS. Estas dos características están correlacionadas con la respuesta de iones móviles en regiones espaciales de carga hacia las interfaces. Los grandes valores de capacitancia bajo iluminación a frecuencias por debajo de las unidades de Hz se explicaron en términos de regiones de cargas espaciales de iones móviles y capacitancias químicas, suponiendo una proporcionalidad entre el número de iones móviles ionizados/activados y la concentración de portadores de carga y flujo de fotones.
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Du, Mao-feng, and 杜茂楓. "Laser direct writer with light intensity modulation." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/99858019108303321159.

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碩士
國立中央大學
機械工程研究所
90
Traditionally, the diffractive optical element (ODE) is made by using the multiple binary-level lithography processes to enhance the diffractive efficiency. Due to the multiple exposures, the manufactory error will be included and more complicate processes is need to be considered. Therefore, to overcome these problems, the grey level mask can be used, in which only one exposure is needed to fabricate the optical element. This project presents that a laser machine with light intensity modulation to fabricate grey level masks. In the writer system, a solid-state laser with the power of 180 mw is used as the working light source. The processed target is laser direct write glass developed by the Canyon Material company. An acoustic-optics modulator (AOM) is used to modulate the laser intensity. To make sure the result of the processed mask, a measurement system is built. The laser direct writer system is already out of the binary methods to manufacture optical mask. The optical elements designer can use the LDW system to design any appropriate mask. Thus, the LDW system is a quite useful system for the ODEs.
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Chen, May-Jung, and 陳玫蓉. "The Influence of Light Intensity on the Pattern Transition of Modulation Instability." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/49081426140076649098.

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碩士
國立中興大學
物理學系所
101
This experiment presents optical modulation instability for coherent light in the photorefractive nonlinear media(Sr0.6 Ba0.4 Nb2 O6, SBN-60).We control the nonlinearity and response time by changing the bias voltage and the intensity of light, and observing the pattern transition of modulation instability. We found that the pattern will be arrested in low and high light intensity, and won’t be arrested easily in higher bias voltage. The proportion of signal beam and background beam would influence the formation of MI pattern, and the pattern would be arrested more easily with higher proportion of background beam.
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Weng, Cheng-Shiu, and 翁旭承. "The Influence of Light Intensity on The Pattern Transition of Modulation instability in the Photorefractive Crystal." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/de475w.

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碩士
國立中興大學
奈米科學研究所
102
We aim at studying and observing the phenomenon and the pattern of optical modulation instability (MI) of the coherent light in photorefractive crystal (Sr 0.6 Ba 0.4 Nb 2 O 6 ，SBN-60). We control the reaction of the medium through the manipulation of voltage, intensity of signal light and intensity of background light . Also, we investigate the pattern of the medium’s optical modulation instability and its relationship to the intensity of light. We observe that when the voltage increases in a non-linear trend, the pattern of the medium’s optical modulation instability changes from two-dimensional plots to a cluster gradually. We also find that not only high , but low signal light intensity restrain the MI pattern, making it difficult to emerge. The higher the voltage, the wider range it is of the MI pattern. Second, the intensity of background light makes an impact on the MI pattern. While enhancing the intensity of the background light, the MI pattern changes from a cluster to stripes gradually. Furthermore, the higher the background light, the more regular it is of the stripes. Finally, we find that under a specific intensity of background light, there’s an MI pattern with high regularity. The regularity decreases as the light intensity increases.
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WANG, CHIA-MING, and 王家銘. "The study of the modulation of intensity and phase of transmitted light induced by the variation of the refractive index of a medium on top surface of a resonant waveguided grating." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/trx4su.

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碩士
國立中正大學
物理系研究所
104
The purpose of this thesis is to propose a new technique of measurement, through the phase difference of TM and TE modes of transmission light of grating structure for GMR, a technique of measuring variation of reflective index based on phase difference can be established. The basic principle of this method is to use Stokes parameter to sketch Poincare sphere, then calculate phase difference to obtain the relationship between the change of reflective index and phase difference. By measuring the sample covered by sugar water, the phase difference measurement shows that the detection sensitivity is ten times more than variation of transmission does. As for the sample which is covered by DE-PMMA, the sensitivity is higher for measurement based on phase difference than measuring the change in transmission.
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Yang, Kin-Min, and 楊楷民. "The Opto-thermal Effect on the Encapsulated Cholesteric Liquid Crystal and Its Application to the Light Intensity Modulator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/rateqv.

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碩士
國立虎尾科技大學
光電與材料科技研究所
101
In this thesis, the transmittance of the micro-encapsulated cholesteric liquid crystal was changed by the pump beam. The opto-thermal effect, induced by the PEDOT absorbing layer, results in the variation of the transmittance on the cholesteric liquid crystal thin films. We discussed the possibility of utilizing this material for the application of flexible electronic papers by evaluating the thickness of cholesteric liquid crystal layer and the PEDOT layer, respectively. The results showed that the patterning effect is better for the sample of 12 μm thick cholesteric liquid crystal layer than that of 25 μm at the same excitation conditions and the same thickness of the PEDOT layer. And the patterning effect is better for the sample of 7.5 μm thick PEDOT than that of 5.5 μm at the same excitation conditions and the same thickness of the cholesteric liquid crystal layer. We also successfully achieved a gray-scale pattern on cholesteric liquid crystal using shutter to control the light excitation time. To explore the reason why the cholesteric liquid crystal appeared a transmittance variation when pumped, two experiments were checked: (1) Under the optical field within the pump intensity range of this experiment, the transmittance of cholesteric liquid crystal were irrelevant to the angles between the pump and probe polarizations. (2) As for the opto-thermal effects, a simple heat-conducting model was proposed to fit with the experimental results. The theoretical and experimental results agree well with this model. The curves of the transmittance of cholesteric liquid crystal evolving with time showed that the higher the pump intensity, the larger the slope is in the transient state. Besides higher the pump intensity, the larger transmittance of the cholesteric liquid crystal has in the steady state. When the pump intensity is higher than 0.4 W/cm2, the recovery of the transmittance of exhibits a delay after the pump is turned off. The curve of the steady state transmittance versus the pump intensity can be divied into three regions: the slowly varying region, working region, the saturated region. When the samples were pumped with the intensities within the working area, the probe intensity varied linearly with the pump intensity. The transmittance of cholesteric liquid crystal can be modulated by the pump intensity. This demonstrates the possibility of applying this technique on the light modulators. The results showed that the probe beam exhibits almost no distortion at the rising part and the falling part of triangular pump intensity profile when thickness of PEDOT layer is 2.5 μm.
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Books on the topic "Light intensity modulation"

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Mulligan, Jeffrey B. Illusory Variations in Apparent Dot Brightness Induced by Density Modulations. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0056.

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When small, closely spaced dots are moved closer together, they appear brighter. The effect is observed for dot spacings of half a degree of visual angle or less and can be cancelled either by dimming the dots themselves or adding a compensating modulation to the background. The effects are easily observed and challenge current models of brightness perception. This illusion demonstrates that we are unable to judge the brightness of a small dot independently of the total amount of light falling in its local neighborhood. All of the dots are rendered with the same intensity, but the dots appear brighter in the regions where the density is higher.
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Book chapters on the topic "Light intensity modulation"

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"Light Intensity Modulation Direct Overwrite." In Magneto-Optical Recording Materials. IEEE, 2009. http://dx.doi.org/10.1109/9780470545218.ch8.

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Newnham, Robert E. "Electro-optic phenomena." In Properties of Materials. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198520757.003.0030.

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Optical beams can be controlled by manipulating the refractive indices and absorption coefficients with applied electric fields. In communication systems electro-optic effects are used in phase and amplitude modulation, in beam deflectors, and in tunable filters. Three such effects are illustrated in Fig. 28.1. Lead lanthanum zirconate titanate (PLZT) is a transparent electroceramic that can be prepared in several different ferroelectric forms with large electro-optic coefficients. When prepared in a normal ferroelectric form it can be used in two different ways. A light-tunable shutter is constructed by coating a multidomain ceramic of PLZT with a photoconducting layer and transparent electrodes. A bias voltage on the electrodes is transferred to the ceramic when the photoconductor is illuminated. The electric field alters the domain structure and the degree of light scattering, controlling the intensity of light. Fully poled ferroelectric ceramics exhibit the linear electro-optic effect Using planar electrodes the PLZT is poled perpendicular to the optical beam. Polarizer and analyzer are positioned in the ±45◦ positions, and light intensity is controlled by altering the birefringence with an electric field. The third experiment utilizes a pseudo-cubic PLZT composition with a large quadratic electro-optic effect. No poling is required in this case. With polarizer and analyzer again in the ±45◦ positions, the transmitted light intensity is proportional to E2 rather than E. Linear and quadratic electro-optic coefficients are defined in terms of the fieldinduced changes in the optical indicatrix: . . . Bij(E) − Bij(0) = Δ
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Conference papers on the topic "Light intensity modulation"

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Kielkopf, John, Elijah Jensen, Frank O. Clark, and Bradley Noyes. "Fractional intensity modulation of diffusely scattered light." In SPIE Optical Engineering + Applications, edited by Marija Strojnik Scholl and Gonzalo Páez. SPIE, 2015. http://dx.doi.org/10.1117/12.2190455.

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Nazar, Andrii, Vasyl Tataryn, Yaroslav Bobitski, and Svitlana Ponomarenko. "3D scanner with modulation of light intensity." In 2017 14th International Conference The Experience of Designing and Application of CAD Systems in Microelectronics (CADSM). IEEE, 2017. http://dx.doi.org/10.1109/cadsm.2017.7916108.

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Sutherland, Richard L., Lalgudi V. Natarajan, Vincent P. Tondiglia, Robert T. Pogue, S. A. Siwecki, Donna M. Brandelik, Bob L. Epling, Eugene L. Berman, Christine Wendel, and Mark G. Schmitt. "Holographic PDLCs for spatial light intensity modulation." In Optoelectronics '99 - Integrated Optoelectronic Devices, edited by Ivan Cindrich, Sing H. Lee, and Richard L. Sutherland. SPIE, 1999. http://dx.doi.org/10.1117/12.349330.

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Lee, Hyeon-Hwa, Woo-Cheol Shin, Seung-Kook Ro, Jong-Kweon Park, and Myounggyu Noh. "Optical Sensor Using Light Intensity Modulation : Feasibility Test." In 2008 International Conference on Smart Manufacturing application (ICSMA). IEEE, 2008. http://dx.doi.org/10.1109/icsma.2008.4505637.

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Zhang, W., Y. Zhao, D. Ha, W. Cai, and P. Wang. "Design of precision light intensity modulation for light-addressable potentiometric sensor." In TRANSDUCERS 2011 - 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2011. http://dx.doi.org/10.1109/transducers.2011.5969580.

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Shen, Chen, Xiaoying Chen, Mingming Wu, and Jin Xu. "Fuzzy location device based on infrared light intensity modulation." In Photonics Asia 2010, edited by Brian Culshaw, Yanbiao Liao, Anbo Wang, Xiaoyi Bao, Xudong Fan, and Lin Zhang. SPIE, 2010. http://dx.doi.org/10.1117/12.869716.

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Celik, Yasin, and Aydin Akan. "DC-informative subcarrier intensity modulation for visible light communication." In 2017 25th Signal Processing and Communications Applications Conference (SIU). IEEE, 2017. http://dx.doi.org/10.1109/siu.2017.7960336.

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Azuma, Takeo, Kenya Uomori, and Atsushi Morimura. "Real-time active range finder using light intensity modulation." In Electronic Imaging '99, edited by Joseph H. Nurre and Brian D. Corner. SPIE, 1999. http://dx.doi.org/10.1117/12.341067.

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Saengudomlert, Poompat. "Flip wavelet packet modulation for visible light communications with intensity modulation and direct detection." In 2017 International Electrical Engineering Congress (iEECON). IEEE, 2017. http://dx.doi.org/10.1109/ieecon.2017.8075841.

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Takahashi, Nobuaki, Kazuto Yoshimura, and Sumio Takahashi. "FBG vibration sensor based on intensity-modulation method with incoherent light." In Optical Engineering for Sensing and Nanotechnology (ICOSN '01), edited by Koichi Iwata. SPIE, 2001. http://dx.doi.org/10.1117/12.427011.

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