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| 1 | Anisotropic metamaterial-assisted all-silicon polarizer with 415-nm bandwidth显示文摘Polarizers have been widely used in various optical systems to reduce polarization cross talk.The polarizers based on the silicon nanowire waveguide can provide chip-scale device size and a high polarization extinction ratio.However,the working bandwidth for the on-chip silicon polarizers is always limited(<~100 nm)by the strong waveguide dispersion.In this paper,an on-chip all-silicon polarizer with an extremely broad working bandwidth is proposed and demonstrated.The device is based on a 180°sharp waveguide bend,assisted with anisotropic subwavelength grating(SWG)metamaterial cladding to enhance the polarization selectivity.For TE polarization,the effective refractive index for SWG is extraordinary,so the incident TE mode can propagate through the sharp waveguide bend.For TM polarization,the effective refractive index for SWG is ordinary,so the incident TM mode will be coupled into the radiation mode regardless of the wavelength.The fabricated polarizer shows low loss(<1 d B)and high polarization extinction ratio(>20 d B)over a>415 nm bandwidth from1.26 to 1.675μm,which is at least fourfold better than what has been demonstrated in all previous works.To the best of our knowledge,such a device is the first all-silicon polarizer that covers O-,E-,S-,C-,L-,and U-bands. | HONGNAN XU DAOXIN DAI YAOCHENG SHI | 2019 | Photonics Research2019，7，12： | 5 |
| 2 | 高性能无源硅光波导器件:发展与挑战显示文摘硅光技术凭借其CMOS兼容性和高集成度等突出优势,被认为是最具发展潜力的新一代光子集成主流技术,在全球范围内受到极大关注。近年来,无源/有源硅光器件及其集成芯片研究均取得了重要进展。而随着光通信、光互连、光传感、光测量及光计算等新兴领域的飞速发展,硅光技术迎来了更为广阔的应用空间。与此同时,硅光器件及芯片也面临着更高性能、更高密度和更大规模等重要挑战。本文聚焦于面向波分复用、偏振复用、模式复用及混合复用等应用的高性能无源硅光波导器件,重点阐述了其性能突破及功能拓展,并探讨了硅光波导器件的发展前景。 | 刘大建 赵伟科 张龙 宋立甲 郭敬书 谢意维 李欢 俞泽杰 刘柳 时尧成 戴道锌 | 2022 | 光学学报2022，42，17： | 3 |
| 3 | Low-loss hybrid plasmonic TM-pass polarizer using polarization-dependent mode conversion显示文摘A low-loss hybrid plasmonic transverse magnetic(TM)-pass polarizer has been demonstrated utilizing polarization-dependent mode conversion.Taking advantage of the silicon hybrid plasmonic slot waveguide(HPSW),the unwanted transverse electric(TE)fundamental mode can be efficiently converted first to a TM higher-order mode and then suppressed by a power combiner,while the retained TM fundamental mode can pass through with negligible influence.Since the HPSW feature both strong structural asymmetry and a small interaction area in the cross-section between the metal and optical field,the optimized insertion loss of the device is as low as 0.4 d B.At the wavelength of 1550 nm,the extinction ratio is 28.3 d B with a moderate footprint of 2.38μm×10μm.For the entire C band,the average reflection of the TE mode is suppressed below-14 d B,and the extinction ratio is over 18.6 d B.This work provides another more efficient and effective approach for better on-chip polarizers. | Ruixuan Chen Bowen Bai Zhiping Zhou | 2020 | Photonics Research2020，8，7： | 0 |
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