Prof. Jun Xia Profile

Prof. Jun Xia

at Southeast Univ

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Author

Publications (11)

Proceedings Article | 13 March 2024 Poster + Paper

A high-efficiency LCoS based SLM design

Yixing Chen, Jun Xia

Proceedings Volume 12908, 129080G (2024) https://doi.org/10.1117/12.3003465

KEYWORDS: Diffraction, Diffraction gratings, Reflectivity, Spatial light modulators, Blazed gratings, Liquid crystals, Liquid crystal on silicon, Design, Optical gratings

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The spatial light modulator (SLM) based on liquid crystal on silicon (LCoS) technology has been widely used in applications such as holography and wavelength selective switches (WSS). Although there is some progress in terms of larger filling factor, improved surface process engineering, the concern lies in the light efficiency of SLM. For the reflectivity, various dielectric layer design have been proposed. This paper presents experimental results on the reflectivity of different filling factors and surface treatments. On the diffraction efficiency, factors such as liquid crystal material, voltage control and fringe field effect are also discussed. Previous research has focus on the phase depth and phase linearity of the SLM, but this paper emphasizes the importance of cell design and voltage control in achieving higher efficiency. The efficiency of blazed gratings with different numbers of steps are compared and intentionally increasing the driving voltage for gratings with a small pitch to compensate for the decrease in sharpness in the fly-back zone are suggested. Then, to estimate the influence of the fringe field effect, four simplified model are analyzed and the calculation result with two panels applied in optical communication in different grating cases, including small pitch grating and larger pitch grating are compared with real test results. The conclusion is valuable for guiding cell design and providing insight into the small pitch large angle blazed grating. Additionally, the diffraction efficiency of a two pi blazed grating is compared for different voltage ranges, starting from the lowest to the highest, with four types of liquid crystal materials filled into identical LCoS cells. Although the changing slope and efficiency values differ, the overall trend remains similar. In conclusion, both material selection and driving voltage control are crucial. A 1550nm LCoS based SLM is designed with more than 80% reflectivity, and the diffraction efficiency is higher than 50% with 4 step single pixel grating and 83% with 16 step single pixel grating.

Proceedings Article | 19 December 2022 Presentation + Paper

A high-efficiency color sequential SLM for holography display

Yixing Chen, Jun Xia

Proceedings Volume 12318, 1231819 (2022) https://doi.org/10.1117/12.2642277

KEYWORDS: Spatial light modulators, Holography, Diffraction, Liquid crystal on silicon, Liquid crystals, Dielectrics, LCDs, Reflectivity, Heads up displays

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Proceedings Article | 24 November 2021 Paper

A compact and low power SLM system for augmented reality applications

Yixing Chen, Jun Xia

Proceedings Volume 12066, 120660A (2021) https://doi.org/10.1117/12.2602133

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Proceedings Article | 7 October 2020 Paper

A high resolution and accuracy phase-only spatial light modulator

Yixing Chen, Jun Xia

Proceedings Volume 11571, 115710I (2020) https://doi.org/10.1117/12.2579888

KEYWORDS: Spatial light modulators, Liquid crystal on silicon, Calibration, Analog electronics, Holography, Liquid crystals, Phase measurement, Spatial resolution, Diffraction

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SPIE Journal Paper | 23 June 2016

Speckle-reduced holographic display by modulating complex amplitude in single-lens system

Chenliang Chang, Jun Xia, Yijun Qi, Caojin Yuan, Shouping Nie

OE, Vol. 55, Issue 06, 063110, (June 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.6.063110

KEYWORDS: Computer generated holography, Modulation, Holography, Phase shift keying, 3D displays, Speckle, Optical filters, 3D image reconstruction, Diffraction, Linear filtering

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Proceedings Article | 11 March 2015 Paper

Colorful holographic display of 3D object based on scaled diffraction by using non-uniform fast Fourier transform

Chenliang Chang, Jun Xia, Wei Lei

Proceedings Volume 9385, 93850H (2015) https://doi.org/10.1117/12.2082606

KEYWORDS: Holograms, Diffraction, Holography, 3D displays, Spatial light modulators, Fourier transforms, Chromatic aberrations, Computer generated holography, Computer simulations, Displays

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Proceedings Article | 25 November 2009 Paper

Three-dimensional scene reconstruction by using lenslet array model in computational integral imaging

YuSheng Huang, Jun Xia, HanChun Yin

Proceedings Volume 7513, 75131E (2009) https://doi.org/10.1117/12.837735

KEYWORDS: 3D modeling, Integral imaging, Image quality, 3D image processing, OpenGL, 3D image reconstruction, 3D displays, Optical components, Image processing, LCDs

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Proceedings Article | 20 November 2009 Paper

A simulation of dielectrophoresis force actuated liquid lens

Xiaoyin Yao, Jun Xia

Proceedings Volume 7510, 751005 (2009) https://doi.org/10.1117/12.837733

KEYWORDS: Dielectrophoresis, Liquids, Dielectrics, Interfaces, Electrodes, Liquid lenses, Microfluidics, Particles, Fluid dynamics, Dielectric polarization

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SPIE Journal Paper | 1 February 2009 Open Access

Three-dimensional light modulation using phase-only spatial light modulator

Jun Xia, Hanchun Yin

OE, Vol. 48, Issue 02, 020502, (February 2009) https://doi.org/10.1117/12.10.1117/1.3076211

KEYWORDS: Modulation, Phase shift keying, 3D displays, 3D image processing, Diffraction, Holography, Numerical simulations, Optical tweezers, Liquid crystal on silicon, Algorithm development

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Proceedings Article | 13 June 2001 Paper

Optical gage for high-temperature strain measurement by using quartz optical fiber

Jun Xia, Chen Wang, Xiaoyuan He, S. Tu, J. Gong

Proceedings Volume 4317, (2001) https://doi.org/10.1117/12.429576

KEYWORDS: Quartz, Optical fibers, Microscopes, Temperature metrology, Digital image processing, CCD cameras, CCD image sensors, Image processing software, Optical tracking, Image processing

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Proceedings Article | 18 August 1998 Paper

Electric field in a single-substrate AC-PDP cell with barriers

Yufeng Jin, Jun Xia

Proceedings Volume 3560, (1998) https://doi.org/10.1117/12.319658

KEYWORDS: Electrodes, Dielectrics, Particles, Plasma display panels, Computer simulations, Flat panel displays, Display technology, Luminous efficiency, Optimization (mathematics), Monte Carlo methods

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