Graphene-Based Polarization-Independent Mid-Infrared Electro-Absorption Modulator Integrated in a Chalcogenide Glass Waveguide

Nanoscale Research Letters

Zhonghua Yang¹  Yong Liu²  Yong Zhou²  Rongguo Lu²  Guangbiao Wang²  Jiangbo Lyu²  Rui Lin²  Meng Tan²  Liming Shen² 

[1] Chongqing United Microelectronics Center, 401332, Chongqing, China;School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, 610054, Chengdu, China;

关键词: Chalcogenide glass;    Graphene;    Mid-infrared;    Optical-modulator;    Polarization-insensitive;   

DOI  :  10.1186/s11671-021-03538-7

来源: Springer

【 摘 要 】

A polarization-insensitive graphene-based mid-infrared optical modulator is presented that comprised SiO2/ Ge23Sb7S70, in which two graphene layers are embedded with a semiellipse layout to support transverse magnetic (TM) and transverse electric (TE) polarizing modes with identical absorption. The key performance index for the polarization independent modulator is polarization-sensitivity loss (PSL). The waveguide of our device just supports basic TE and TM modes, and the PSL between two modes is of < 0.24 dB. The model can offer extinction ratio (ER) more than 16 dB and insertion loss less than 1 dB. The operation spectrum ranges from 2 to 2.4 μm with optical bandwidth of 400 nm. The 3 dB modulation bandwidth is as high as 136 GHz based on theoretical calculation.

【 授权许可】

CC BY