Topic: |
Frontiers in Biological Microscopy |
Speaker: |
Peter So, MIT |
Abstract:
In this tutorial, we will focus on two recent research directions in my laboratory applying fluorescence and Raman imaging and spectroscopy for a couple of interesting biomedical applications. In the area of fluorescence, we have recently published De-scattering with Excitation Patterning (DEEP). DEEP is based on projecting two-photon temporal-focusing generated patterns on depth-resolved planes in turbid tissues and applying computational approach to quickly recover high resolution images. We now combine DEEP with fluorescence lifetime imaging in order to map neuronal connectivity based on quantifying fluorescence energy transfer between donor and acceptor molecules labeling pre- and post-synaptic terminal adhesion proteins. In the area of Raman, we have recently published Raman2RNA. In Raman2RNA, we have demonstrated that variations in Raman spectroscopic signatures can be correlated with stem cell differentiation states measured by single-cell RNAseq. Important, non-invasive Raman imaging can recapitulate transcriptome evolution that could only be measured previously by destructive end-point assays such as RNAseq. We are now extending this approach to develop a very high throughput spontaneous Raman total internal reflection imaging method in order to extend Raman2RNA for identifying senescence cells in animal and human tissues in vivo.
Biography:
Topic: |
Photonics for Neuromorphic Computing |
Speaker: |
Paul Prucnal, Princeton |
Biography:
Topic: |
Sensing with Optical Fibers |
Speaker: |
Jin Wei, The Hong Kong Polytechnic University |
Abstract:
Optical fiber sensors have been actively researched for over 50 years. Optical fibers can be configured to sense a multitude of parameters, based on different transducing mechanisms. Many optical fiber sensors have been commercialized and successfully applied to aerospace, energy, and other industries for critical applications such as navigation and structural health monitoring. This tutorial will introduce the basics of optical fiber sensing, primarily on intrinsic type of sensors where optical fibers play the role of both sensing and signal transmission. Focus will be on those fiber sensors that have a clear advantage over the non-fiber sensors, including fiber-optic gyroscopes, electric current sensors, acoustic sensor arrays, fibre grating sensors, and distributed sensors based on Raman, Brillouin and Rayleigh scattering. Microstructured optical fibers and optical nanofibers are relatively recent developments, which enable novel sensors with enhanced light-matter (gas and liquid) interaction inside or near the fiber core. The basics of light guiding in these fibers as well as recent development of high sensitivity gas sensing with these fibers, based on the principles of light absorption, photothermal, photoacoustic and Raman spectroscopy, will be discussed.
Biography:
Wei Jin currently holds the position of Chair Professor of Photonic Instrumentation at The Hong Kong Polytechnic University (PolyU). He received a BEng degree in Control and Instrumentation from Beijing University of Aeronautics and Astronautics (Beihang University), China, and a PhD degree in Optoelectronics from University of Strathclyde, Scotland. He has researched extensively on optical fiber components and systems for sensing applications, including fiber-optic rotation sensors (gyros), pressure and acoustic sensors, temperature sensors, Bragg grating sensors, and gas sensors. He received numerous awards including PolyU President Award (twice) for outstanding research performance, NSFC Distinguished Young Scholar Award, Chiang Jiang Chair Professor Award, and 2020 China’s Top Ten Optical Breakthrough Award. He was the General Co-Chair of the 25th International Conference on Optical Fiber Sensors (OFS-25) and the Technical Chair of OFS-22. Professor Jin is a fellow of OSA, a director of the Optical Society of China and a vice Chairman of the Fiber and Integrated Optics Specialty Committee of the Optical Society of China.
Topic: |
Integrated Lithium Niobate Photonics on an Etchless Platform |
Speaker: |
Xiankai Sun, The Chinese University of Hong Kong |
Abstract:
Integrated photonics plays an important role in computation and communication because of many advantages such as large bandwidth and low power consumption. Lithium niobate (LN) is an excellent optical functional material because of its ultrabroad optical transparency window and large optical nonlinearity. However, making micro- or nanosized structures and devices in LN requires high-quality etching of LN, which adds to the fabrication difficulties and limits its applications. We developed an etchless lithium niobate integrated photonic platform, by patterning a fabrication-friendly material on top of LN and adopting the principle of “bound states in the continuum” for operation. We demonstrated ultralow-loss waveguides and ultrahigh-Q microcavities at both near-visible and telecom wavelengths. Based on that, we further realized second-harmonic generation, acousto-optic modulation, wavelength-division multiplexing, high-dimensional optical communication, and hybrid 2D-material/LN photonic integration.
Biography:
Prof. Xiankai Sun received his Ph.D. degree in Applied Physics from California Institute of Technology in 2010. From 2010 to 2014, he was a Postdoctoral Associate and then Associate Research Scientist in Department of Electrical Engineering at Yale University. Since 2014, he has been with The Chinese University of Hong Kong, where he is currently an Associate Professor of Electronic Engineering and Associate Director for Center of Optical Sciences. His current research focuses on novel photonic and optomechanical nanodevices for both fundamental research and practical applications. Prof. Sun served Optics Express and Scientific Reports as an Associate Editor or Editorial Board Member. He is currently an Associate Editor for Optica and Journal of Lightwave Technology. He was a session organizer/chair/co-chair at the conferences PIERS 2016, 2021, IMCO 2018, 2019, and OGC 2022, and a technical committee member at the conferences ACP 2018, 2020, ICOCN 2019, CLEO 2020–2022, and AOPC 2021. He was honored as a finalist of the Blavatnik Awards for Young Scientists by New York Academy of Sciences in 2013 for his contribution to “experimental research of nanoscale optomechanical systems.” He also received the Early Career Award from Research Grants Council of Hong Kong in 2015.\
Topic: |
Design and Fabrication of Custom Phase Masks for Lensless Photography |
Speaker: |
Seung Ah Lee, ,Yonsei University |
Abstract:
Lensless cameras are a novel class of computational imaging devices, in which the lenses are replaced with a thin mask to achieve ultra-compact and low-cost hardware. In this talk, I present a method for high-throughput fabrication of lensless cameras designed with arbitrary point spread functions (PSFs) for various imaging tasks. The workflow of our method involves designing the smooth phase mask profiles for a given PSF pattern via a phase retrieval algorithm and then fabricating the mask in single-shot via the grayscale lithography technique. Our combined workflow allows an ultra-fast and cost-effective fabrication of phase masks and is suitable for mass production and commercialization of lensless cameras. I will demonstrate various imaging applications of our custom lensless cameras and discuss future directions.
Biography:
Seung Ah Lee is an assistant professor in the Department of Electrical and Electronic Engineering at Yonsei University. Prior to Yonsei, she was at Verily Life Sciences, a former Google [x] team, as a scientist between 2015 to 2018. She received her Ph. D. in Electrical Engineering at Caltech (2014) under the supervision of Prof. Changhuei Yang, and a postdoctoral training at Stanford Bioengineering (2014-2015). She completed her BS (2007) and MS (2009) degree in Electrical Engineering at Seoul National University. Her current research interests include computational microscopy, lensless microscopy and lensless photography.
Topic: |
Integrated Acousto-Optics using Lithium Niobate Platform |
Speaker: |
Linbo Shao, Virginia Tech |
Abstract:
Acoustic waves at microwave frequencies are the basis for numerous applications including microwave filters, oscillators, delay lines, and sensors, and recently they are emerging as versatile interfaces between quantum systems such as superconducting circuits, defect centers, and optical devices. Compared to gigahertz electromagnetic waves, acoustic waves feature five-orders-of-magnitude shorter wavelength, do not radiate into free space, and much higher quality (Q) factors. Meanwhile, integrated acousto-optic or Brillouin scattering devices have enabled a wide range of applications including optical frequency shifting, microwave-to-optical conversion (modulation), microwave photonic filtering and nonreciprocal transmission. In this talk, we will discuss our recent progress in developing integrated acoustic-wave and acousto-optic circuits using lithium niobate. We achieved phase and amplitude modulations of guided acoustic waves by electrical voltages and introduced tunable gain and loss for acoustic waves. We also realized efficient acousto-optic interactions on chip for microwave-to-optical conversions, frequency shifting, and optical frequency comb generation. We vision applications of integrated acousto-optic devices for microwave signal processing and quantum phononic circuits leveraging the strong piezoelectricity, photoelasticity, and electro-optics of the lithium niobate platform.
Biography:
Linbo Shao is an Assistant Professor in the Bradley Department of Electrical and Computer Engineering at Virginia Tech. Before he joined Virginia Tech, he was a Postdoctoral Fellow in the John A. Paulson School of Engineering and Applied Sciences at Harvard University. He received his Ph.D. in Engineering Science in 2019 and M.S. in Applied Physics in 2016 from Harvard university, and B.S. in microelectronics in 2014 from Peking University. His current research interests include integrated acousto-optics and electro-acoustics on the lithium niobate platform and diamond color centers. He also worked on chaotic whispering-gallery-mode optical cavities and optical sensing.
Topic: |
Ultrafast Imaging of Structures and Dynamics Using Time-of-Flight Detection of Optical Frequency Combs |
Speaker: |
Jungwon Kim, KAIST |
Abstract:
I discuss our recent advancements in ultrafast 3D imaging of complex structures and dynamics in micro-scale devices and micro-resonators. Electro-optic sampling of optical frequency combs enables sub-nanometer precision time-of-flight detection over several millimeter measurable ranges.
Biography:
Jungwon Kim received the B.S. degree in electrical engineering from Seoul National University, Seoul, South Korea, in 1999, and the S.M. and Ph.D. degrees in electrical engineering and computer science from the Massachusetts Institute of Technology (MIT), Cambridge, MA, USA, in 2004 and 2007, respectively. From 2007 to 2009, he was a Postdoctoral Associate with the Research Laboratory of Electronics, MIT. In 2009, he joined the faculty of the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, where he is currently a professor of mechanical engineering and an adjunct professor of electrical engineering. His research interests are optical frequency combs and their applications in microwave/mm-wave photonics, ultrafast 3D imaging, photonic signal processing, and industrial metrology. Dr. Kim is a Topical Editor of Optics Letters.
Topic: |
Heterogeneous Integration for Silicon and Silicon Nitride Photonics |
Speaker: |
Chao Xiang, The University of Hong Kong |
Abstract:
Silicon photonics is evolving rapidly into advanced photonic integrated circuits. Heterogeneous photonic integration not only provides efficient III-V gain and laser sources on silicon, but also offers a new degree of freedom to engineer the on-chip photonic device performance. On the other hand, silicon nitride is emerging in applications where its superior passive properties are fully exploited. In this talk I’ll discuss the recent progress of heterogeneous integration for silicon and silicon nitride photonics, which could enable the next-generation high-performance photonic integrated circuits for applications including interconnects, sensing, metrology and so on.
Biography:
Dr. Chao Xiang is currently an Assistant Professor at the Department of Electrical and Electronic Engineering (EEE), the University of Hong Kong (HKU). His research focuses on heterogeneous photonic integration, silicon photonics, semiconductor lasers and photonic integrated circuits. Before joining HKU, he was a Postdoctoral Scholar and obtained his Ph.D. degree both at University of California, Santa Barbara. He obtained his B.E degree from Huazhong University of Science and Technology and M.Phil. degree from the Chinese University of Hong Kong.
Topic: |
Innovations in Optics and Photonics for Addressing Important Real-World Challenge |
Speaker: |
Xiang Liu, Huawei Hong Kong |
Abstract:
OPTICA has recently established its Foundation’s 20th Anniversary Challenge program, which aims to use optics and photonics, find solutions to important questions, and impact our world in a positive way. This is in line with the theme of TENCON 2022, “Tech-Biz Intelligence”, which encourages researchers to discuss and explore advanced technologies in advancing humanity. In this talk, I will review several important real-world challenges that need ground-breaking innovations in three categories, environment, health and information. The outstanding innovations selected by OPTICA will also be highlighted and discussed, in the hope of stimulating more research to advance and benefit humanity.
Biography:
Dr. Xiang Liu is chief optical communication standards expert of Huawei Technologies. He had been VP for Optical Transport and Access at Futurewei Technologies and a Distinguished Member of Technical Staff at Bell Labs. He received the Ph.D. degree in applied physics from Cornell University in 2000. As a top-ranked Google Scholar in optical communications, he has authored/coauthored more than 350 journal and conference papers and holds over 100 US patents. He has served as a Technical Program Co-Chair of OFC 2016 and a General Co-Chair of OFC 2018. Xiang is a Fellow of IEEE and OPTICA, as well as a selection committee member of the OPTICA Foundation’s 20th Anniversary Challenge program.
Topic: |
Ultrafast Nanoscale 3D Printing based on Digital Holography & Temporal Focusing |
Speaker: |
Shih-Chi Chen, The Chinese University of Hong Kong |
Abstract:
Two-photon polymerization (TPP) is the most precise 3D printing process that has been used to create many complex structures for advanced photonic and nanoscale applications. Yet, to date the technology still remains a laboratory tool due to its high operation cost and limited fabrication rate. In this seminar, I will present our recent works on the parallelization of the TPP process based on (1) temporal focusing and (2) binary holography, where programmable femtosecond light sheets and thousands of shaped laser beams are used to substantially improve the rate without sacrificing resolution. Our experiments demonstrate arbitrarily complex structures can be fabricated at a record-breaking resolution and speed, i.e., lateral/axial resolution: 140 nm/175 nm at 10s mm3/min, which is 3 orders of magnitude higher than state-of-the-art commercial solutions. By combining our ultrafast laser patterning technology and swellable hydrogels, we further expand the material variety to include metals, metal oxides, semiconductors, dielectric materials etc., enabling nanometer-scale 3D functional devices to be directly fabricated. Our new methods provide an effective and low-cost solution to scale-up the fabrication of functional micro- and nano-structures (~$1.5/mm3). This means our technology may play a large role in fields such as healthcare, clean energy and water, computing, and telecommunications.
Biography:
Dr. Shih-Chi Chen is a Professor in the Department of Mechanical and Automation Engineering at the Chinese University of Hong Kong. He received his B.S. degree in Mechanical Engineering from the National Tsing Hua University, Taiwan, in 1999; and his S.M. and Ph.D. degrees in Mechanical Engineering from the Massachusetts Institute of Technology, Cambridge, in 2003 and 2007, respectively. Following his graduate work, he entered a post-doctoral fellowship in the Wellman Center for Photomedicine, Harvard Medical School, where his research focused on biomedical optics and endomicroscopy. From 2009 to 2011, he was a Senior Scientist at Nano Terra, Inc., a start-up company founded by Prof. George Whitesides at Harvard University, to develop precision instruments for novel nanofabrication processes. His current research interests include ultrafast laser applications, biomedical optics, precision engineering, and nanomanufacturing. Dr. Chen is a member of the American Society for Precision Engineering (ASPE), American Society of Mechanical Engineers (ASME), SPIE, and the Optical Society (OSA); and currently serves as the Associate Editor of ASME Journal of Micro- and Nano-Manufacturing, IEEE Transactions on Nanotechnology, and HKIE Transactions. In 2003 and 2018, he received the prestigious R&D 100 Awards for developing a six-axis nanopositioner and an ultrafast nanoscale 3-D printer respectively.
Topic: |
On-chip Quantum Photonic Sources and Quantum State Manipulations |
Speaker: |
Xi-Feng Ren, USTC |
Abstract:
Integrated quantum photonics has attracted intensive attention due to the compactness, scalability, and stability. An on-chip photonic quantum source, especially an on-chip entangled photon source, is a basic device for realizing quantum photonic integrated circuits (QPICs). We first demonstrate that a silicon-on-insulator nanowire can be used to generate bi- and multiphoton polarization entangled qubits, then we report an on-chip transverse-mode entangled photon source via the spontaneous four-wave mixing processes in a multimode silicon waveguide. At last, I will introduce our recent works on silicon quantum logic gates: an ultra-compact quantum CNOT gate and a waveguide-mode encoded quantum CNOT gate.
Biography:
Professor, University of science and technology of China, Youth scholar of “Changjiang Scholars Program of Ministry of Education of China”. His research interests include quantum photonic integrated chips, quantum nanophotonics, quantum optics, quantum information, etc. So far, he has published more than 100 SCI papers in these research fields, in which 40 were published in recent 5 years, including 1 in Science, 4 in Phys. Rev. Lett., 2 in Light-Sci. Appl., 1 in Optica, 1 in LPR, 2 in Nano Lett. etc.
Topic: |
Scalably Produced Optical Metamaterials for Energy and Sustainability |
Speaker: |
Xiaobo Yin, University of Hong Kong |
Abstract:
Micro/nanostructured materials offer significantly new opportunities for high-efficiency devices and systems for energy harvesting, conversion and storage. There is, however, a tremendous gap between the proof-of-principle demonstrations at the small scale and the intrinsically large-scale real-world energy systems and sustainable applications. In this talk, I will give an overview of our research and, more specifically, present our recent development on how structured photonic materials address the challenge of the tremendous power hungry for space cooling and promote photosynthesis and crop yield in greenhouses.
Biography:
Dr. Xiaobo Yin received his PhD from Stanford University in 2008 and is currently a Professor of Mechanical Engineering at the University of Hong Kong. He is a fellow of OSA and SPIE. Prior to joining the University of Hong Kong, he was the Bruce S. Anderson Faculty Fellow of the College of Engineering and Applied Sciences at the University of Colorado Boulder. His research focuses on nanostructured optical materials, radiative heat transfer, high-temperature materials, and scalable manufacturing. He authored and co-authored more than 100 journal publications and is one of the most highly cited researchers by Clarivate Analytics. His works have been featured in numerous media outlets including Nature, Science, Physics Today, Scientific American, the Economists, and Forbes. He was a recipient of the 2015 DARPA Young Faculty Award, the 2017 Moore Inventor Fellowships, and the 2017 Kavli Foundation Early Career Lectureship of Materials Science. His recent work on passive radiative cooling was named one of the top 10 breakthroughs of the year 2017 by the Institute of Physics (IOP) Physics World and the top 10 most reviewed news by The Economists.
Topic: |
Disordered Optics For Multidimensional Information Processing |
Speaker: |
Nicholas X Fang, University of Hong Kong |
Abstract:
For high throughput and non-destructive screening of chemical, biological, and physical properties, there is a critical need for compact and lightweight hyperspectral imaging instruments for high-resolution, and fast spectral imaging. How to effectively sample and reconstruct the spatial and spectral information? In this invited talk, disordered photonic devices with scalable microfabrication are explored for multidimensional information processing. As an example, we report snapshot spectral imaging through spectral basis encoding in the Fourier domain, accomplished by a compact filter design consisting of diffractive optical element (DOE) arrays and a spatial modulation layer. The DOE layer differentiates the major Fourier spectral components, which are spatially modulated by the SML to achieve de-aliasing in the Fourier domain. Our results indicate that the major spatial-spectral information is preserved and can be efficiently reconstructed. We will also discuss the opportunities and challenges of disordered photonic devices such as scattering reservoir computers.
Biography:
Professor Nicholas Fang joined the University of Hong Kong in 2022 as a Global STEM Professor of Mechanical Engineering. Before that, he served as a full professor with tenure in Mechanical Engineering at M.I.T. Professor Fang earned his B.S. and M.S. degrees in Physics from Nanjing University, China; and Ph.D. degree in Mechanical Engineering from the University of California at Los Angeles. Professor Fang’s recognition includes the International Commission of Optics (ICO) Prize/Ernest Abbe Medal from the International Commission of Optics; the NSF CAREER Award; the Society of Manufacturing Engineering Outstanding Young Investigator Award; Technology Review Magazine’s 35 Young Innovators Award, and Top 10 Emerging breakthrough technologies of the year 2015; the ASME Chao and Trigger Young Manufacturing Engineer Award and the ASME Pi Tau Sigma Gold Medal Award. He was elected a Fellow of the Optica (formerly Optical Society of America) in 2021, and the microArch S240 micro-precision 3D printer from his start-up, BMF company, is recognized by the 2021 PRISM Award.