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| 1 | Chip-scale broadband spectroscopic chemical sensing using an integrated supercontinuum source in a chalcogenide glass waveguide显示文摘On-chip spectroscopic sensors have attracted increasing attention for portable and field-deployable chemical detection applications. So far, these sensors largely rely on benchtop tunable lasers for spectroscopic interrogation. Large footprint and mechanical fragility of the sources, however, preclude compact sensing system integration. In this paper, we address the challenge through demonstrating, for the first time to our knowledge, a supercontinuum source integrated on-chip spectroscopic sensor, where we leverage nonlinear Ge_(22)Sb_(18)Se_(60) chalcogenide glass waveguides as a unified platform for both broadband supercontinuum generation and chemical detection. A home-built, palm-sized femtosecond laser centering at 1560 nm wavelength was used as the pumping source. Sensing capability of the system was validated through quantifying the optical absorption of chloroform solutions at 1695 nm. This work represents an important step towards realizing a miniaturized spectroscopic sensing system based on photonic chips. | QINGYANG DU ZHENGQIAN LUO HUIKAI ZHONG YIFEI ZHANG YIZHONG HUANG TUANJIE DU WEI ZHANG TIAN GU JUEJUN HU | 2018 | Photonics Research2018，6，6： | 9 |
| 2 | Real-time,in situ probing of gamma radiation damage with packaged integrated photonic chips显示文摘Integrated photonics is poised to become a mainstream solution for high-speed data communications and sensing in harsh radiation environments,such as outer space,high-energy physics facilities,nuclear power plants,and test fusion reactors.Understanding the impact of radiation damage in optical materials and devices is thus a prerequisite to building radiation-hard photonic systems for these applications.In this paper,we report real-time,in situ analysis of radiation damage in integrated photonic devices.The devices,integrated with an optical fiber array package and a baseline-correction temperature sensor,can be remotely interrogated while exposed to ionizing radiation over a long period without compromising their structural and optical integrity.We also introduce a method to deconvolve the radiation damage responses from different constituent materials in a device.The approach was implemented to quantify gamma radiation damage and post-radiation relaxation behavior of SiO2-cladded SiC photonic devices.Our findings suggest that densification induced by Compton scattering displacement defects is the primary mechanism for the observed index change in SiC.Additionally,post-radiation relaxation in amorphous SiC does not restore the original pre-irradiated structural state of the material.Our results further point to the potential of realizing radiation-hard photonic device designs taking advantage of the opposite signs of radiation-induced index changes in SiC and SiO2. | QINGYANG DU JEROME MICHON BINGZHAO LI DEREK KITA DANHAO MA HAIJIE ZUO SHAOLIANG YU TIAN GU ANURADHA AGARWAL MO LI JUEJUN HU | 2020 | Photonics Research2020，8，2： | 1 |
| 3 | Pd-Catalyzed Synthesis of a-Awl Vinylphosphonates via Suzuki Arylation of a-Phosphonovinyl Nonaflates显示文摘 | Meijuan Yuan Yewen Fang Li Zhang Xiaoping Jin Minjia Tao Qilin Ye Ruifeng Li Jinjian Li Hui Zheng Juejun Gu | 2015 | Chinese Journal of Chemistry2015，33，10： | 0 |
| 4 | Wide field-of-view metalens: a tutorial显示文摘Wide field-of-view(FOV)optics are essential components in many optical systems,with applications spanning imaging,display,sensing,and beam steering.Conventional refractive wide FOV optics often involve multiple stacked lenses,resulting in large size and weight as well as high cost.Metasurface lenses or metalenses promise a viable solution to realizing wide FOV optics without complex lens assembly.We review the various architectures of wide FOV metalenses,elucidate their fundamental operating principles and design trade-offs,and quantitatively evaluate and contrast their imaging performances.Emerging applications enabled by wide FOV metasurface optics are also discussed. | Fan Yang Mikhail YShalaginov Hung-I Lin Sensong An Anu Agarwal Hualiang Zhang Clara Rivero-Baleine Tian Gu Juejun Hu | 2023 | Advanced Photonics2023，5，3： | 0 |
| 5 | Monolithically integrated stretchable photonics显示文摘Mechanically stretchable photonics provides a new geometric degree of freedom for photonic system design and foresees applications ranging from artificial skins to soft wearable electronics.Here we describe the design and experimental realization of the first single-mode stretchable photonic devices.These devices,made of chalcogenide glass and epoxy polymer materials,are monolithically integrated on elastomer substrates.To impart mechanical stretching capability to devices built using these intrinsically brittle materials,our design strategy involves local substrate stiffening to minimize shape deformation of critical photonic components,and interconnecting optical waveguides assuming a meandering Euler spiral geometry to mitigate radiative optical loss.Devices fabricated following such design can sustain 41%nominal tensile strain and 3000 stretching cycles without measurable degradation in optical performance.In addition,we present a rigorous analytical model to quantitatively predict stressoptical coupling behavior in waveguide devices of arbitrary geometry without using a single fitting parameter. | Lan Li Hongtao Lin Shutao Qiao Yi-Zhong Huang Jun-Ying Li Jérôme Michon Tian Gu Carlos Alosno-Ramos Laurent Vivien Anupama Yadav Kathleen Richardson Nanshu Lu Juejun Hu | 2017 | Light(Science & Applications)2017，6，1： | 0 |
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