A Narrow Spectrum Terahertz Emitter Based on Graphene Photoconductive Antenna

被引：0
|
作者：
G. Jemima Nissiyah
M. Ganesh Madhan
机构：
[1] Anna University,Department of Electronics Engineering, MIT Campus
来源：
Plasmonics | 2019年 / 14卷
关键词：
Graphene; Terahertz emitters; Femtosecond lasers; Photoconduction; THz sensing; Narrowband; Stub;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Many terahertz applications such as sensing, imaging, and spectroscopy require coherent terahertz (THz) sources. A basic Ti-Au dipole antenna on GaAs substrate is designed initially and it is enhanced into a photoconductive antenna for terahertz emission. A spectral width of 120 GHz is obtained from the emission spectrum. In order to compare the spectral characteristics, a graphene dipole antenna is designed on the same substrate. It is observed that graphene dipole yields a narrower spectral width of 70 GHz, due to its high Q factor. Spectral width of the graphene dipole antenna is further made narrow to 25 GHz, by incorporating a λ/4 stub on the stripline to produce a filtering operation. The antenna provides a directivity of 6.14 dBi with stub which shows an improvement of 0.3 dB when compared with an antenna without stub.
引用
收藏
页码：2003 / 2011
页数：8
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