Prof. Yu-Hwa Lo Profile

Prof. Yu-Hwa Lo

Principal Investigator at Univ of California San Diego

SPIE Involvement:

Conference Program Committee | Author

Publications (32)

Proceedings Article | 20 February 2020 Presentation + Paper

Presentation + Paper

2D image-guided cell sorter and 3D imaging flow cytometer

Yu-Hwa Lo, Rui Tang, Xinyu Chen, Zunming Zhang, Lauren Waller, Jiajie Chen, Yi Gu, Chang-Hung Lee, Ivan Gagne, Yuanyuan Han, Alex Ce Zhang, Sung Hwan Cho

Proceedings Volume 11250, 112500H (2020) https://doi.org/10.1117/12.2547689

KEYWORDS: 3D image processing, Signal detection, Stereoscopy, Leukemia, Image processing, Microscopes, Microfluidics, Feature extraction, Spatial filters, Objectives

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Proceedings Article | 14 June 2017 Presentation

Presentation

Photon detection with an ultra low noise and highly efficient amplification mechanism (Conference Presentation)

Yu-Hwa Lo

Proceedings Volume 10212, 1021207 (2017) https://doi.org/10.1117/12.2264244

KEYWORDS: Current controlled current source, Photon counting, Photodetectors

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Proceedings Article | 20 February 2017 Paper

Paper

A high-efficiency low-noise signal amplification mechanism for photodetectors

Mohammad Abu Raihan Miah, Yu-Hsin Liu, David Hall, Yu-Hwa Lo, Iftikhar Ahmad Niaz

Proceedings Volume 10108, 101080X (2017) https://doi.org/10.1117/12.2253792

KEYWORDS: Silicon, Silicon photonics, Photodetectors, Sensors, Signal detection, Phonons, Ionization, Avalanche photodetectors, Electrons, Chemical species, Doping, Boron, Absorption

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Proceedings Article | 26 September 2016 Presentation + Paper

Presentation + Paper

Cycling excitation process for light detection and signal amplification in semiconductors

Yu-Hsin Liu, Alex Zhang, Mohammad Abu Raihan Miah, David Hall, Ifikhar Ahmad Niaz, Lujiang Yan, Yugang Yu, Mahmut Kavrik, Yu-Hwa Lo

Proceedings Volume 9933, 99330C (2016) https://doi.org/10.1117/12.2238585

KEYWORDS: Signal processing, Signal detection, Semiconductors, Phonons, Ionization, Silicon, Avalanche photodetectors, Diodes, Absorption, Avalanche photodiodes

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Proceedings Article | 7 March 2016 Paper

Paper

Imaging flow cytometer using computation and spatially coded filter

Yuanyuan Han, Yu-Hwa Lo

Proceedings Volume 9720, 972010 (2016) https://doi.org/10.1117/12.2209401

KEYWORDS: Microfluidics, Luminescence, Spatial resolution, Image quality, Image filtering, Flow cytometry, Optical testing, Light scattering, Statistical analysis, Microfluidic imaging, Backscatter, Spatial filters, Image restoration, Microscopes, Imaging systems, Scattering

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Proceedings Article | 29 May 2013 Paper

Paper

Multiple gain mechanisms integrated in APDs biased below breakdown for sensitivity improvement

Yu Hwa Lo, Samia Nawar Rahman, David Hall, Zhe Mei

Proceedings Volume 8727, 87270P (2013) https://doi.org/10.1117/12.2018831

KEYWORDS: Photons, Electrodes, Avalanche photodetectors, Field effect transistors, Negative feedback, Heterojunctions, Sensors, Indium gallium arsenide, Instrument modeling, Signal detection

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Proceedings Article | 13 March 2013 Paper

Paper

Rapid white blood cell detection for peritonitis diagnosis

Tsung-Feng Wu, Zhe Mei, Yu-Jui Chiu, Sung Hwan Cho, Yu-Hwa Lo

Proceedings Volume 8615, 86150O (2013) https://doi.org/10.1117/12.2003439

KEYWORDS: Microfluidics, Blood, Lab on a chip, Scattering, Point-of-care devices, Kidney, Signal detection, Laser scattering, Silicon, Digital signal processing

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Proceedings Article | 17 September 2011 Paper

Paper

Self-recovered InGaAs single photon avalanche detector with patterned Zn-diffused structure

James Cheng, Yu-Hwa Lo

Proceedings Volume 8154, 81540H (2011) https://doi.org/10.1117/12.895272

KEYWORDS: Diffusion, Zinc, Single photon, Sensors, Indium gallium arsenide, Heterojunctions, Photomasks, Quantum efficiency, Etching, Silica

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Proceedings Article | 16 September 2011 Paper

Paper

Physics of self-recovering single photon avalanche detectors

James Cheng, Yuhwa Lo, Sifang You

Proceedings Volume 8155, 81551H (2011) https://doi.org/10.1117/12.895971

KEYWORDS: Electrons, Sensors, Single photon, Physics, Signal processing, Interfaces, Absorption, Indium gallium arsenide, Heterojunctions, Quenching (fluorescence)

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Proceedings Article | 13 September 2011 Paper

Paper

Optofluidic biosensors: miniaturized multi-color flow cytometer and fluorescence-activated cell sorter (microFACS)

Sung Hwan Cho, Chun-Hao Chen, Yu-Hwa Lo

Proceedings Volume 8099, 80990F (2011) https://doi.org/10.1117/12.901258

KEYWORDS: Luminescence, Microfluidics, Waveguides, Signal detection, Actuators, Signal processing, Ferroelectric materials, Bacteria, Control systems, Optical filters

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Proceedings Article | 16 February 2010 Paper

Paper

Fabrication of vertical silicon nanowire photodetector arrays using nanoimprint lithography

Yu-Hwa Lo, Arthur Zhang, Hongkwon Kim

Proceedings Volume 7591, 759106 (2010) https://doi.org/10.1117/12.842276

KEYWORDS: Silicon, Nanoimprint lithography, Quartz, Etching, Ultraviolet radiation, Sensors, Nanolithography, Nickel, Scanning electron microscopy, Nanowires

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Proceedings Article | 16 February 2010 Paper

Paper

Integrated bio-inspired fluidic imaging system

Nam-Hyong Kim, Yu-Hwa Lo, Daniel Johnson, Sung Hwan Cho, Cameron Francis, Frank Tsai, Ashkan Arianpour, Wen Qiao

Proceedings Volume 7605, 76050D (2010) https://doi.org/10.1117/12.843694

KEYWORDS: Zoom lenses, Cameras, Biomimetics, Imaging systems, Microfluidics, Microfluidic imaging, Lens design, Laparoscopy, Surgery, Liquid crystals

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Proceedings Article | 23 January 2010 Paper

Paper

High-sensitivity visible and IR (1550nm) Si nanowire photodetectors

James Cheng, Yu-Hwa Lo, Hongkwon Kim, Arthur Zhang

Proceedings Volume 7608, 76082F (2010) https://doi.org/10.1117/12.847060

KEYWORDS: Silicon, Visible radiation, Sensors, Nanoimprint lithography, Crystals, Etching, Photodetectors, Nanolithography, Infrared sensors, Nanowires

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Proceedings Article | 23 January 2010 Paper

Paper

Characterization and physics of top-down silicon nanowire phototransistors

Hongkwon Kim, Yu-Hwa Lo, James Cheng, Yisi Liu, Arthur Zhang

Proceedings Volume 7608, 76081D (2010) https://doi.org/10.1117/12.841201

KEYWORDS: Silicon, Doping, Phototransistors, Photodetectors, Temperature metrology, Numerical simulations, Modulation, Electrons, Physics, Nanowires

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Proceedings Article | 30 April 2009 Paper

Paper

Self-quenched InGaAs single-photon detector

Sifang You, James Cheng, Yuhwa Lo, Kai Zhao

Proceedings Volume 7320, 732010 (2009) https://doi.org/10.1117/12.819950

KEYWORDS: Indium gallium arsenide, Single photon, Single photon detectors, Negative feedback, Quenching (fluorescence), Avalanche photodiodes, Instrument modeling, Picosecond phenomena, Absorption, Ionization

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Proceedings Article | 18 November 2008 Paper

Paper

Microfluidic photonic integrated circuits

Jessica Godin, Sung Hwan Cho, Chun Hao Chen, Frank Tsai, Yu-Hwa Lo

Proceedings Volume 7135, 71350M (2008) https://doi.org/10.1117/12.807153

KEYWORDS: Microfluidics, Ferroelectric materials, Signal detection, Waveguides, Actuators, Lenses, Light scattering, Particles, Photonic integrated circuits, Luminescence

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Proceedings Article | 11 September 2008 Paper

Paper

Miniaturized unified imaging system using bio-inspired fluidic lens

Yu-Hwa Lo, Nam-Hyong Kim, Sung Hwan Cho, Wen Qiao, Frank Tsai

Proceedings Volume 7061, 70610N (2008) https://doi.org/10.1117/12.801922

KEYWORDS: Zoom lenses, Image quality, Cameras, Imaging systems, Modulation transfer functions, Surgery, Biomimetics, Image sensors, Monochromatic aberrations, Microfluidic imaging

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Proceedings Article | 25 September 2007 Paper

Paper

Fast and power-efficient infrared single-photon upconversion using hot-carrier luminescence

Kai Zhao, Hod Finkelstein, Yu-Hwa Lo, Matthias Gross, Sadik Esener

Proceedings Volume 6710, 671014 (2007) https://doi.org/10.1117/12.728822

KEYWORDS: Photons, Silicon, Upconversion, Electrons, Sensors, Infrared radiation, Luminescence, Electroluminescence, Capacitance, Avalanche photodiodes

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Proceedings Article | 6 May 2005 Paper

Paper

Fabrication of polypyrrole nanowires

Yu-Hwa Lo, Yevgeny Berdichevsky

Proceedings Volume 5759, (2005) https://doi.org/10.1117/12.599897

KEYWORDS: Nanolithography, Gold, Semiconducting wafers, Semiconductors, Glasses, Artificial muscles, Proteins, Polymers, Aluminum, Nanowires

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Proceedings Article | 14 August 2003 Paper

Paper

APDs for single-photon detection at telecom wavelengths

Yimin Kang, William Risk, Yu-Hwa Lo, Donald Bethune

Proceedings Volume 5246, (2003) https://doi.org/10.1117/12.511418

KEYWORDS: Avalanche photodetectors, Single photon detectors, Data modeling, Optical components, Wavelength division multiplexing, Optical communications, Quantum efficiency, Avalanche photodiodes, Instrument modeling, Performance modeling

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Proceedings Article | 29 August 2002 Paper

Paper

InGaAs-Si avalanche photodiodes fabricated by wafer bonding

Phil Mages, Yimin Kang, Steve Hummel, Tao Feng, Paul Yu, Yu-Hwa Lo, Alexandre Pauchard, Martin Bitter, Zhong Pan

Proceedings Volume 4905, (2002) https://doi.org/10.1117/12.481018

KEYWORDS: Avalanche photodetectors, Silicon, Indium gallium arsenide, Wafer bonding, Interfaces, Absorption, Avalanche photodiodes, Thermal effects, Crystals, Ionization

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Proceedings Article | 21 May 2002 Paper

Paper

Wafer-bonded InGaAs/silicon avalanche photodiodes

Alexandre Pauchard, Yimin Kang, Martin Bitter, Z. Pan, Steve Hummel, Yu-Hwa Lo, Phil Mages, D. Sengupta, Paul Yu

Proceedings Volume 4650, (2002) https://doi.org/10.1117/12.467674

KEYWORDS: Avalanche photodetectors, Silicon, Receivers, Avalanche photodiodes, Indium gallium arsenide, Ionization, Semiconducting wafers, Electrons, Absorption, Crystals

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Proceedings Article | 17 October 2001 Paper

Paper

Long-wavelength photonic integrated circuits and avalanche photodetectors

Steve Hummel, Alexandre Pauchard, Yi-Jen Tsou, Sergey Zaytsev, Yu-Hwa Lo

Proceedings Volume 4581, (2001) https://doi.org/10.1117/12.445074

KEYWORDS: Avalanche photodetectors, Photonic integrated circuits, Vertical cavity surface emitting lasers, Single mode fibers, Data communications, Semiconducting wafers, Laser applications, Receivers, Interfaces, Optical components

Read Abstract +

Fast-growing internet traffic volume require high data communication bandwidth over longer distances. Access network bottlenecks put pressure on short-range (SR) telecommunication systems. To effectively address these datacom and telecom market needs, low-cost, high-speed laser modules at 1310 to 1550 nm wavelengths and avalanche photodetectors are required. The great success of GaAs 850nm VCSEls for Gb/s Ethernet has motivated efforts to extend VCSEL technology to longer wavelengths in the 1310 and 1550 nm regimes. However, the technological challenges associated with materials for long wavelength VCSELs are tremendous. Even with recent advances in this area, it is believed that significant additional development is necessary before long wavelength VCSELs that meet commercial specifications will be widely available. In addition, the more stringent OC192 and OC768 specifications for single-mode fiber (SMF) datacom may require more than just a long wavelength laser diode, VCSEL or not, to address numerous cost and performance issues. We believe that photonic integrated circuits (PICs), which compactly integrate surface-emitting lasers with additional active and passive optical components with extended functionality, will provide the best solutions to today's problems. Photonic integrated circuits have been investigated for more than a decade. However, they have produced limited commercial impact to date primarily because the highly complicated fabrication processes produce significant yield and device performance issues. In this presentation, we will discuss a new technology platform of InP-based PICs compatible with surface-emitting laser technology, as well as a high data rate externally modulated laser module. Avalanche photodetectors (APDs) are the key component in the receiver to achieve high data rate over long transmission distance because of their high sensitivity and large gain- bandwidth product. We have used wafer fusion technology to achieve InGaAs/Si APDs with much greater potential than the traditional InGaAs/InP APDs. Preliminary results on their performance will be presented.

Proceedings Article | 15 October 2001 Paper

Paper

InP-based three-dimensional photonic integrated circuits

Steve Hummel, Alexandre Pauchard, Sergey Zaytsev, Yu-Hwa Lo, Diana Tsou

Proceedings Volume 4600, (2001) https://doi.org/10.1117/12.444674

Read Abstract +

Fast-growing internet traffic volumes require high data communication bandwidth over longer distances than short wavelength (850 nm) multi-mode fiber systems can provide. Access network bottlenecks put pressure on short-range (SR) telecommunication systems. To effectively address these datacom and telecom market needs, low cost, high-speed laser modules at 1310 and 1550 nm wavelengths are required. The great success of GaAs 850 nm VCSELs for Gb/s Ethernet has motivated efforts to extend VCSEL technology to longer wavelengths in the 1310 and 1550 nm regimes. However, the technological challenges associated with available intrinsic materials for long wavelength VCSELs are tremendous. Even with recent advances in this area, it is believed that significant additional development is necessary before long wavelength VCSELs that meet commercial specifications will be widely available. In addition, the more stringent OC192 and OC768 specifications for single-mode fiber (SMF) datacom may require more than just a long wavelength laser diode, VCSEL or not, to address numerous cost and performance issues. We believe that photonic integrated circuits, which compactly integrate surface-emitting lasers with additional active and passive optical components with extended functionality, will provide the best solutions to today's problems. Photonic integrated circuits (PICs) have been investigated for more than a decade. However, they have produced limited commercial impact to date primarily because the highly complicated fabrication processes produce significant yield and device performance issues. In this presentation, we will discuss a new technology platform for fabricating InP-based photonic integrated circuits compatible with surface-emitting laser technology. Employing InP transparency at 1310 and 1550 nm wavelengths, we have created 3-D photonic integrated circuits (PICs) by utilizing light beams in both surface normal and in-plane directions within the InP-based structure. This additional beam routing flexibility allows significant size reduction and process simplification without sacrificing device performance. This innovative 3-D PIC technology platform can be easily extended to create surface-emitting lasers integrated with power monitoring detectors, micro-lenses, external modulators, amplifiers, and other passive and active components. Such added functionality can produce cost--effective solutions for the highest-end laser transmitters required for datacom and short range telecom networks, as well as fiber channels and other cost and performance sensitive applications. We present results for 1310 nm photonic IC surface-emitting laser transmitters operating at 2.5 Gbps without active thermal electric cooling.

SPIE Journal Paper | 1 December 1998

Wafer-bonded 1.3-um vertical cavity surface emitting lasers

Yanyan Xiong, Jizhi Zhang, Yu-Hwa Lo

OE, Vol. 37, Issue 12, (December 1998) https://doi.org/10.1117/12.10.1117/1.601984

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Quantum wells, Dielectric mirrors, Oxygen, Wafer-level optics, Dielectrics, Diffusion, Continuous wave operation

Proceedings Article | 20 July 1998 Paper

Paper

Surface-micromachined optical polarizers for magneto-optical data storage

Yu-Hwa Lo, Zuhua Zhu, Chuan Pu

Proceedings Volume 3328, (1998) https://doi.org/10.1117/12.320183

KEYWORDS: Polarization, Silicon, Fresnel lenses, Thin films, Polarizers, Beam splitters, Dielectric polarization, Collimation, Data storage, Surface micromachining

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Proceedings Article | 27 January 1998 Paper

Paper

Compliant substrate technology for heterogeneous integration

J. Zhang, Zuhua Zhu, Yu-Hwa Lo, Daryl Dagel, Y. Zhou, David Thomas Crouse, L. Srivasta, Rong Zhou

Proceedings Volume 10292, 1029205 (1998) https://doi.org/10.1117/12.300614

KEYWORDS: Indium gallium arsenide, Semiconductors, Gallium arsenide, Silicon, Optoelectronic devices, Crystals, Interfaces, Germanium, Transmission electron microscopy, Luminescence

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Proceedings Article | 6 June 1997 Paper

Paper

GaAs compliant substrates: a new substrate with a stretchable lattice for mismatched III-V epitaxial growth

Felix Ejeckam, Yu-Hwa Lo, B. Hammons, Yi Qian, Zuhua Zhu, Shanthi Subramanian, Hong Hou

Proceedings Volume 2994, (1997) https://doi.org/10.1117/12.275606

KEYWORDS: Gallium arsenide, Thin films, Crystals, Thin film growth, Photomicroscopy, Optoelectronic devices, Semiconductors, Semiconducting wafers, Interfaces, Materials science

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Proceedings Article | 11 April 1997 Paper

Paper

Surface micromachined tunable resonant cavity LED using wafer bonding

Minghwei Hong, J. Mannaerts, Alex Tran, Rajaram Bhat, Zuhua Zhu, Gina Christenson, Yu-Hwa Lo

Proceedings Volume 3008, (1997) https://doi.org/10.1117/12.271432

KEYWORDS: Mirrors, Wafer bonding, Semiconducting wafers, Light emitting diodes, Surface micromachining, Wavelength division multiplexing, Reflectivity, Fabrication, Quantum wells, Vertical cavity surface emitting lasers

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Proceedings Article | 4 April 1997 Paper

Paper

Wafer-bonded AlGaInAs 1.3-um vertical-cavity surface-emitting lasers

Diana Huffaker, Yu-Hwa Lo, Y. Yu, Wei Lin, B. Hammons, Hong Hou, Mingcheng Wang, Dennis Deppe, Zuhua Zhu, Yi Qian

Proceedings Volume 3003, (1997) https://doi.org/10.1117/12.271063

KEYWORDS: Vertical cavity surface emitting lasers, Mirrors, Etching, Quantum wells, Dielectric mirrors, Interfaces, Indium gallium arsenide, Doping, Continuous wave operation, Reactive ion etching

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Proceedings Article | 22 January 1997 Paper

Paper

Wafer bonding technology and its optoelectronic applications

Zuhua Zhu, Gina Christenson, Yi Qian, Felix Ejeckam, Yu-Hwa Lo

Proceedings Volume 3006, (1997) https://doi.org/10.1117/12.264243

KEYWORDS: Wafer bonding, Semiconducting wafers, Mirrors, Optoelectronic devices, Vertical cavity surface emitting lasers, Interfaces, Optoelectronics, Aluminum, Silicon, Sensors

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Proceedings Article | 30 September 1996 Paper

Paper

Wafer bonding technology and its applications in optoelectronic devices

Zuhua Zhu, Guilan Ding, Yi Qian, Yu-Hwa Lo, Gina Christenson, Felix Ejeckam, Kangsheng Chen

Proceedings Volume 2891, (1996) https://doi.org/10.1117/12.253172

KEYWORDS: Wafer bonding, Semiconducting wafers, Optoelectronic devices, Gallium arsenide, Mirrors, Vertical cavity surface emitting lasers, Etching, Silicon, Optoelectronics, Indium gallium arsenide

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Showing 5 of 32 publications

Proceedings Volume Editor (1)

SPIE Conference Volume | 11 November 2008

Optoelectronic Materials and Devices III

Conference Committee Involvement (27)

High-Speed Biomedical Imaging and Spectroscopy X

25 January 2025 | San Francisco, United States

High-Speed Biomedical Imaging and Spectroscopy IX

27 January 2024 | San Francisco, California, United States

High-Speed Biomedical Imaging and Spectroscopy VIII

28 January 2023 | San Francisco, California, United States

High-Speed Biomedical Imaging and Spectroscopy VII

22 January 2022 | San Francisco, California, United States

High-Speed Biomedical Imaging and Spectroscopy VI

6 March 2021 | Online Only, California, United States

Integrated Sensors for Biological and Neural Sensing

6 March 2021 | Online Only, California, United States

High-Speed Biomedical Imaging and Spectroscopy V

1 February 2020 | San Francisco, California, United States

Biosensing and Nanomedicine XII

11 August 2019 | San Diego, California, United States

High-Speed Biomedical Imaging and Spectroscopy IV

2 February 2019 | San Francisco, California, United States

Biosensing and Nanomedicine XI

19 August 2018 | San Diego, California, United States

High-Speed Biomedical Imaging and Spectroscopy III: Toward Big Data Instrumentation and Management

29 January 2018 | San Francisco, California, United States

Biosensing and Nanomedicine X

6 August 2017 | San Diego, California, United States

Biosensing and Nanomedicine IX

28 August 2016 | San Diego, California, United States

Biosensing and Nanomedicine VIII

9 August 2015 | San Diego, California, United States

Biosensing and Nanomedicine VII

17 August 2014 | San Diego, California, United States

Biosensing and Nanomedicine III

25 August 2013 | San Diego, California, United States

Biosensing and Nanomedicine II

12 August 2012 | San Diego, California, United States

Biosensing and Nanomedicine

21 August 2011 | San Diego, California, United States

Biosensing III

1 August 2010 | San Diego, California, United States

Biosensing II

4 August 2009 | San Diego, California, United States

Optoelectronic Materials and Devices III

27 October 2008 | Hangzhou, China

Biosensing

12 August 2008 | San Diego, California, United States

Optoelectronic Materials and Devices

2 November 2007 | Wuhan, China

Optoelectronic Materials and Devices for Optical Communications

7 November 2005 | Shanghai, China

Semiconductor and Organic Optoelectronic Materials and Devices

9 November 2004 | Beijing, China

Emerging Optoelectronic Applications

26 January 2004 | San Jose, CA, United States

Materials, Active Devices, and Optical Amplifiers

4 November 2003 | Wuhan, China

Showing 5 of 27 Conference Committees

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