Ultra-Broadband TE-Pass Polarizer Using a Cascade of Multiple Few-Layer Graphene Embedded Silicon Waveguides

作     者：Yin, Xiang Ke, Xianmin Chen, Lin Zhang, Tian Li, Junhao Zhu, Zhongshu Li, Xun 

作者机构：Huazhong Univ Sci Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada 

出 版 物：《JOURNAL OF LIGHTWAVE TECHNOLOGY》 (J Lightwave Technol)

年 卷 期：2016年第34卷第13期

页      面：3181-3187页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 0702[理学-物理学] 

基　　金：NSFC [11104093, 11474116] Fundamental Research Funds for the Central Universities [HUST: 2015TS074] WNLO 

主　　题：Integrated optics devices polarization-selective devices waveguides 

摘      要：Considering that the variation of the modal characteristics for the TM mode is significantly larger than that for the TE mode when graphene is involved in a silicon-based waveguide, a silicon waveguide TE-pass polarizer with few-layer graphene embedded is proposed and demonstrated. Such a polarizer shows the performance merits including ultrahigh extinction ratio, low insertion loss for the TE mode, ultracompact footprint, and tunable bandwidth by dynamically varying the chemical potential of graphene with gate voltage. We further reveal that the operation bandwidth can be significantly enlarged by cascading multiple polarizers, each of which consists of a silicon waveguide embedded with few-layer graphene and is biased at different gate voltages. We numerically demonstrate that using a cascade of seven polarizers, it is capable of achieving 20-dB extinction ratio and ultralow insertion loss for the TE mode ( 0.13 dB) with bandwidth over 120 nm at telecommunication wavelengths.