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| 1 | Tunable optical delay line based on integrated grating-assisted contradirectional couplers显示文摘Tunable optical delay lines are one of the key building blocks in optical communication and microwave systems.In this work, tunable optical delay lines based on integrated grating-assisted contradirectional couplers are proposed and experimentally demonstrated. The device performance is comprehensively improved in terms of parameter optimization, apodization analysis, and electrode design. Tunable group delay lines of 50 ps at different wavelengths within the bandwidth of 12 nm are realized with a grating length of 1.8 mm. Under thermal tuning mode, the actual delay tuning range is around 20 ps at 7.2 V voltage. At last, a new scheme adopting an ultra-compact reflector for doubling group delay is proposed and verified, achieving a large group delay line of 400 ps and a large dispersion value up to 5.5 × 10~6 ps∕(nm · km) within bandwidth of 12 nm. Under thermal tuning mode, the actual delay tuning range is around 100 ps at 8 V voltage. | XU WANG YUHE ZHAO YUNHONG DING SANSHUI XIAO JIANJI DONG | 2018 | Photonics Research2018，6，9： | 4 |
| 2 | Graphene photodetector employing double slot structure with enhanced responsivity and large bandwidth显示文摘Silicon photonics integrated with graphene provides a promising solution to realize integrated photodetectors operating at the communication window thanks to graphene’s ultrafast response and compatibility with CMOS fabrication process.However, current hybrid graphene/silicon photodetectors suffer from low responsivity due to the weak light-graphene interaction. Plasmonic structures have been explored to enhance the responsivity, but the intrinsic metallic Ohmic absorption of the plasmonic mode limits its performance. In this work, by combining the silicon slot and the plasmonic slot waveguide, we demonstrate a novel double slot structure supporting high-performance photodetection, taking advantages of both silicon photonics and plasmonics. With the optimized structural parameters, the double slot structure significantly promotes graphene absorption while maintaining low metallic absorption within the double slot waveguide. Based on the double slot structure, the demonstrated photodetector holds a high responsivity of 603.92 m A/W and a large bandwidth of 78 GHz. The high-performance photodetector provides a competitive solution for the silicon photodetector. Moreover,the double slot structure could be beneficial to a broader range of hybrid two-dimensional material/silicon devices to achieve stronger light-matter interaction with lower metallic absorption. | Siqi Yan Yan Zuo Sanshui Xiao Leif Katsuo Oxenlowe Yunhong Ding | 2022 | Opto-Electronic Advances2022，5，12： | 3 |
| 3 | Graphene-plasmon polaritons: From fundamental properties to potential applications显示文摘 | Sanshui Xiao Xiaolong Zhu Bo-Hong Li N. Asger Mortensen | 2016 | Frontiers of physics2016，11，2： | 2 |
| 4 | Resonator channel drop filters in a plasmon-polaritons metal显示文摘 | Sanshui Xiao Liu Liu Min Qiu | 2006 | Opt Express2006，14，7： | 1 |
| 5 | A novel directional coupler utilizing a left-handed material显示文摘 | Xiao Sanshui Shen Linfang He Sailing | 2004 | IEEE Photonics Technology Letters2004，16，1： | 1 |
| 6 | Stability and Quality Factor of a One-dimensional Subwavelength Cavity Resonator Containing a Left-handed Materials 显示文摘 | SHEN LINFANG HE SAILING XIAO SANSHUI | 2004 | Phys Rev B2004，69，11： | 1 |
| 7 | Resonator clannel drop filters in a plasmon-polaritons metal显示文摘 | Sanshui Xiao Liu Liu Min Qiu | | 0，，： | 1 |
| 8 | FDTD method for computing the off-plane band structure in a two-dimensional photonic crystal consisting of mearly free-electron metals 显示文摘 | Sailing He | 2002 | Physica2002，324，： | 1 |
| 9 | Coupling Between Plane Waves and Bloch Waves in Photonic Crystals with Negative Refraction显示文摘 | RUAN Zhi-chao QIU Min XIAO Sanshui | 2005 | Phys Rev B2005，71，04： | 1 |
| 10 | Mechanically scanned leaky-wave antenna based on a topological one-way waveguide显示文摘We propose a uniform backfire-to-endfire leaky-wave antenna(LWA)based on a topological one-way waveguide under external bias magnetic field.We systematically analyze the dispersion,showing that the proposed structure supports leaky mode arisen from total internal reflection.By means of tuning frequency or magnetic field,we obtain fixed-bias frequency and fixed-frequency bias LWA with continuous beam scanning from backward,broadside to forward direction.More importantly,we,for the first time,demonstrate that this proposed LWA shows mechanical tunability,allowing us to manipulate the radiation direction from backward,broadside to forward direction by mechanically tuning the air layer thickness.The simulated results show that our system exhibits super low 3dB beam width,high radiation efficiency as well as high antenna gain.Being provided such multiple controlled(especially mechanically)beam scanning manners,the present LWA paves an advanced approach for continuous beam scanning,holding a great potential for applications in modern communication and radar system. | Qian Shen Yun You Jie Xu Yun Shen Xiaohua Deng Zhuoyuan Wang Weidong Min Linfang Shen Sanshui Xiao | 2020 | Frontiers of physics2020，15，3： | 0 |
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