Dr. Jianbo Zhao Profile

Dr. Jianbo Zhao

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Publications (7)

SPIE Journal Paper | 5 August 2021

Design of a waveguide eye-tracking system operating in near-infrared with holographic optical elements

Raymond Kostuk, Jianbo Zhao, Benjamin Chrysler

OE, Vol. 60, Issue 08, 085101, (August 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.8.085101

KEYWORDS: Holographic optical elements, Waveguides, Holograms, Wavefronts, Optical design, Holography, Refractive index, Diffraction, Multiplexing, Modulation

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SPIE Journal Paper | 25 May 2021 Open Access

Holographic low concentration optical system increasing light collection efficiency of regular solar panels

Jianbo Zhao, Benjamin Chrysler, Raymond Kostuk

JPE, Vol. 11, Issue 02, 027002, (May 2021) https://doi.org/10.1117/12.10.1117/1.JPE.11.027002

KEYWORDS: Solar cells, Holographic optical elements, Diffraction, Holography, Glasses, Holograms, Solar energy, Modulation, Diffusers, Sun

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Proceedings Article | 15 April 2020 Presentation + Paper

Design of volume holographic lenses for operation at 850nm in augmented reality eyewear applications

Jianbo Zhao, Jilian Nguyen, Benjamin Chrysler, Raymond Kostuk

Proceedings Volume 11350, 1135003 (2020) https://doi.org/10.1117/12.2556045

KEYWORDS: Holography, Holograms, Optical design, Wavefronts, Diffraction, Augmented reality, Holographic optical elements, Lenses, Eyewear, Volume holography

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Recent research in augmented reality (AR) eyewear has prompted interest in the use of volume holographic optical elements (VHOEs) for this application. This interest in VHOEs is due to a number of factors including: their formation in thin, lightweight films that can be deposited on a variety of substrate; high diffraction efficiency, transparency, and low scatter of the resulting elements; the ability to multiplex several elements in the same aperture; and the potential for mass production by using replication methods. However, a number of design issues must be taken into consideration when using VHOEs especially when used as input and output couplers that have optical power as required for AR eyewear. One such issue is the design of input and output couplers with optical power for use at wavelengths that differ from the construction wavelength. For instance, most photopolymers and dichromated gelating materials are sensitive in the blue-red (450-650 nm) wavelength range but not in the infrared (IR) (750-900nm) where sensing is desired for AR systems. Several methods have been suggested in the literature to address this problem for holographic lenses and vary in the degree of complexity. The problem of making holographic lenses for waveguide input and output couplers at different wavelengths is even more complex due to the need to exceed the critical angle for the construction beams. Fortunately, optical sensing functions frequently do not require high resolution, and this can be used to advantage in the design process. In this paper, a design method is presented that combines wavefront/diffraction efficiency optimization, nonsequential raytracing, and wavefront compensation to form waveguide couplers with an optical power that are formed with a construction wavelength of 532 nm and a reconstruction wavelength of 850 nm. The aberrations caused by Bragg mismatch and the contrast reduction introduced by ghost images are analyzed by simulation and experiment. The experimental results show that an image resolution of ~10 lp/mm can be achieved with the holographic lens with potential improvement to ~40 lp/mm by including a cylindrical lens in the reconstruction beams.

Proceedings Article | 9 September 2019 Presentation + Paper

Spectrum-splitting photovoltaic system using bifacial cells for high energy yield

Benjamin Chrysler, Xuessen Tan, Jianbo Zhao, Raymond Kostuk

Proceedings Volume 11121, 111210B (2019) https://doi.org/10.1117/12.2528049

KEYWORDS: Solar energy, Solar cells, Silicon, Holography, Photovoltaics, Diffraction, Gallium arsenide, Diffusers

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Proceedings Article | 9 September 2019 Presentation + Paper

Improved solar illumination collection using holographic light management techniques

Jianbo Zhao, Benjamin Chrysler, Sam Tan, Raymond Kostuk

Proceedings Volume 11120, 111200L (2019) https://doi.org/10.1117/12.2529868

KEYWORDS: Holographic optical elements, Solar cells, Reflection, Holography, Solar energy, Diffraction, Systems modeling

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Proceedings Article | 14 September 2018 Presentation + Paper

Holographic cap collectors for enhanced mid-day energy production of vertically mounted bifacial photovoltaic modules

Silvana Ayala Pelaez, Sam Tan, Benjamin Chrysler, Jianbo Zhao, Yuechen Wu, Raymond Kostuk

Proceedings Volume 10758, 107580P (2018) https://doi.org/10.1117/12.2321678

KEYWORDS: Solar cells, Holography, Diffraction, Holographic optical elements, Holograms, Diffraction gratings, Solar energy, Sun, Optical design

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Proceedings Article | 14 September 2018 Presentation + Paper

Increased power collection efficiency of conventional silicon photovoltaic modules with holographic light management techniques

Jianbo Zhao, Yuechen Wu, Benjamin Chrysler, Silvana Ayala Pelaez, Raymond Kostuk

Proceedings Volume 10758, 1075809 (2018) https://doi.org/10.1117/12.2321643

KEYWORDS: Solar cells, Diffusers, Holograms, Diffraction, Silicon, Solar energy, Diffraction gratings, Optical design, Holography

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