Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

High-speed gate-tunable terahertz coherent perfect absorption using a split-ring graphene

Not Accessible

Your library or personal account may give you access

Abstract

We exploit split-ring graphene to realize coherent perfect absorption (CPA) in the terahertz (THz) regime. By controlling the relative phase of two counter-propagating coherent beams, the coherent absorption at resonant frequency of 2.91 THz can be tuned continuously from 99.7% to less than 2.1×104%, which gives a modulation contrast of 56.7 dB. Moreover, the coherent absorption also can be tuned by varying the gate-controlled Fermi energy based on the electro-absorption effect of graphene, giving a modulation contrast of 19 dB. Center frequency tunable CPA is also achieved using gate-tunable split-ring graphene. We discuss the tolerance of the geometric parameters (radii of the inner and outer circles, gap aperture) and study the device performance dependence on the relative intensities of two input beams and the angle between two input beams. Additionally, the response time of the device is analyzed to be 36ps, which indicates possible high-speed gate-tunable THz CPA operations.

© 2015 Optical Society of America

Full Article  |  PDF Article
More Like This
Tunable terahertz coherent perfect absorption in a monolayer graphene

Yuancheng Fan, Fuli Zhang, Qian Zhao, Zeyong Wei, and Hongqiang Li
Opt. Lett. 39(21) 6269-6272 (2014)

Graphene-based terahertz metasurface with tunable spectrum splitting

Zhaoxian Su, Xuan Chen, Jianbo Yin, and Xiaopeng Zhao
Opt. Lett. 41(16) 3799-3802 (2016)

Tunable terahertz perfect absorber with a graphene-based double split-ring structure

Zhendong Wu, Bijun Xu, Mengyao Yan, Bairui Wu, Pan Cheng, and Zhichao Sun
Opt. Mater. Express 11(1) 73-79 (2021)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved