Low Voltage Graphene-Based Amplitude Modulator for High Efficiency Terahertz Modulation

Nanomaterials

Qianying Zheng¹  Chunlei Du¹  Hongliang Cui¹  Linlong Tang¹  Liangping Xia² 

[1] Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems, Yangtze Normal University, Chongqing 408100, China;

关键词: terahertz;    amplitude modulation;    transmittance;    single-layer graphene;    metamaterial;    solid electrolyte;    field-effect transistor;   

DOI  :  10.3390/nano10030585

来源: DOAJ

【 摘 要 】

In this paper, a high-efficiency terahertz amplitude modulation device based on a field-effect transistor has been proposed. The polarization insensitive modulator is designed to achieve a maximum experimental modulation depth of about 53% within 5 V of gate voltages using monolayer graphene. Moreover, the manufacturing processes are inexpensive. Two methods are adopted to improve modulation performance. For one thing, the metal metamaterial designed can effectively enhance the electromagnetic field near single-layer graphene and therefore greatly promote the graphene’s modulation ability in terahertz. For another, polyethylene oxide-based electrolytes (PEO:LiClO₄) acts as a high-capacity donor, which makes it possible to dope single-layer graphene at a relatively low voltage.

【 授权许可】

Unknown