Dr. Yu Yao Profile

Dr. Yu Yao

Assistant Professor at Arizona State Univ

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Publications (7)

Proceedings Article | 4 October 2024 Presentation

Polarimetric imaging enhanced inspection for concentrated solar power reflectors

Mo Tian, Kolappan Chidambaranathan, Neel Desai, Jing Bai, Randy Brost, Daniel Small, David Novick, Md Zubair Ebne Rafique, Julius Yellowhair, Yu Yao

Proceedings Volume PC13149, PC1314901 (2024) https://doi.org/10.1117/12.3029791

KEYWORDS: Polarimetry, Inspection, Reflectors, Biological imaging, Polarization, Reflection, Mirrors, Cameras, Unmanned aerial vehicles, Sun

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Proceedings Article | 2 October 2024 Presentation

Heliostat mirror soiling detection based on polarimetric imaging

Mo Tian, Md Zubair Ebne Rafique, Kolappan Chidambaranathan, Randy Brost, Daniel Small, David Novick, Julius Yellowhair, Yu Yao

Proceedings Volume PC13130, PC1313003 (2024) https://doi.org/10.1117/12.3029792

KEYWORDS: Mirrors, Polarimetry, Polarization, Reflection, Rayleigh scattering, Particles, Imaging systems, Specular reflections, Solar thermal energy, Reflectometry

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Proceedings Article | 9 September 2019 Presentation

Highly efficient on-chip integratable metasurface devices for polarimetric detection and imaging (Conference Presentation)

Yu Yao, Ali Basiri, Jing Bai, Xiahui Chen, Jiawei Zuo, Chao Wang

Proceedings Volume 11088, 110880O (2019) https://doi.org/10.1117/12.2527337

KEYWORDS: Polarimetry, Plasmonics, Polarization control, Dielectric polarization, Nanostructuring, Optical properties, Structural engineering, Lenses, Wave plates, Holography

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Optical metasurface refers to a kind of nanostructured material with sub-wavelength thickness and on-demand optical properties, which are not possible for natural materials. By rationally engineering the metasurface structures, one could achieve new capabilities for the manipulation of light, e.g., ultra-thin flat lenses, waveplates and holographic plates. Yet, the optical efficiency and performance of most metasurface-based devices are yet to improve to meet the requirements for real-world applications. In this talk, I will present our research on highly efficient on-chip integratable metasurface devices for ultra-compact polarimetric detection and imaging devices. I will discuss about our approach to realize highly efficient broadband hybrid metasurfaces (based on integrated dielectric and plasmonic metasurfaces) for phase and polarization control of light in near infrared wavelength (1.2-1.7 µm). We have theoretically investigated and experimentally demonstrated circular polarization (CP) detection with CP extinction ratio (defined as the ratio between the transmission of CP light with desired handedness and that of CP light with the other handedness) of 30 and transmission efficiency over 80%. I will also discuss about another approach of realizing highly efficient plasmonic metasurfaces for phase and polarization control of light in mid-infrared wavelength (2-12 µm). Despite the high ohmic loss of plasmonic metasurfaces, I will show that by rationally designing the metasurface structure, it is possible to realize highly efficient plasmonic devices with superior performance. As a proof-of-concept demonstration, we have designed and experimentally demonstrated CP polarization filters with transmission efficiency >85% and CP extinction ratio >50 at 4 µm (bandwidth > 600 nm for CP extinction ratio> 10). The total thickness of the metasurface structure is less than 1/10 of the operational wavelength. Last but not the least, I will present our recent progress on chip-integration of metasurface devices for full-stokes polarimetric detection and imaging.

Proceedings Article | 17 February 2011 Paper

High performance quantum cascade lasers with broadband gain spectra

Yu Yao, Xiaojun Wang, Jen-Yu Fan, William Charles, Tracy Tsai, Jianxin Chen, Gerard Wysocki, Claire Gmachl

Proceedings Volume 7953, 795317 (2011) https://doi.org/10.1117/12.873854

KEYWORDS: Quantum cascade lasers, Electroluminescence, Pulsed laser operation, Laser damage threshold, Laser development, Laser scattering, Electron transport, Tunable lasers, Indium gallium arsenide, Cladding

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SPIE Journal Paper | 1 November 2010

Strategies toward the realization of two-dimensional broadband and coherent quantum cascade ring laser arrays

Elvis Mujagic, Clemens Schwarzer, Werner Schrenk, Yu Yao, Jianxin Chen, Claire Gmachl, Gottfried Strasser

OE, Vol. 49, Issue 11, 111113, (November 2010) https://doi.org/10.1117/12.10.1117/1.3505830

KEYWORDS: Quantum cascade lasers, Laser damage threshold, Resonators, Silicon, Optical engineering, Waveguides, Temperature metrology, Visibility, Tunable lasers, Electrical engineering

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Proceedings Article | 23 January 2010 Paper

Quantum cascade laser absorption spectroscopy of UF6 at 7.74 um for analytical uranium enrichment measurements

Rafal Lewicki, Anatoliy Kosterev, Fatima Toor, Yu Yao, Claire Gmachl, Tracy Tsai, Gerard Wysocki, Xiaojun Wang, Mariano Troccoli, Mary Fong, Frank Tittel

Proceedings Volume 7608, 76080E (2010) https://doi.org/10.1117/12.841939

KEYWORDS: Quantum cascade lasers, Uranium, Absorption, Molecules, Absorption spectroscopy, Quartz, Sensors, Mid-IR, Spectroscopy, Laser spectroscopy

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Proceedings Article | 3 February 2009 Paper

Voltage tuning of gain spectra in quantum cascade lasers

Yu Yao, Kale Franz, Zhijun Liu, Anthony Hoffman, Claire Gmachl

Proceedings Volume 7230, 723012 (2009) https://doi.org/10.1117/12.808295

KEYWORDS: Electroluminescence, Laser damage threshold, Laser scattering, Quantum cascade lasers, Tunable lasers, Resistance, Quantum wells, Scattering, Laser development, Luminescence

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Showing 5 of 7 publications

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