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

High-sensitivity and independently tunable perfect absorber using a nanohole and a cross-shaped graphene

Not Accessible

Your library or personal account may give you access

Abstract

In this paper, a highly sensitive and tunable graphene-based quad-band perfect or nearly perfect absorber is theoretically investigated. The proposed design is composed of a stacked nanohole and cross-shaped graphene on top of a gold layer separated by an insulator. Based on the numerical simulations, four absorption peaks are observed in the proposed structure, which can reach to 100% at 9.47 µm, 93% at 10.03 µm, 97% at 13.93 µm, and 96% at 18.81 µm in the infrared range. It has been shown that the absorption peaks can be independently tuned by varying the Fermi energy level of the graphene layers as well as the geometrical parameters of the structure, which is highly desired for wavelength selective sensing. In addition, the proposed absorber can be used as a plasmonic sensor for refractive index sensing with maximum sensitivity of ${12.86} \frac{{{\unicode{x00B5}{\rm m}}}}{{{\textbf RIU}}}$ and figure of merit of 49.90, which is very remarkable compared to the previous reported values. Due to the symmetry of the proposed device, a wide angle-insensitive high absorption is maintained for all of the bands under transverse-electric and transverse-magnetic polarizations. With its excellent performance, our graphene-based tunable multiband absorber can be used in biosensors, chemical sensors, and many other nanophotonics devices.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
Design of a multiband graphene-based absorber for terahertz applications using different geometric shapes

Patri Upender and Amarjit Kumar
J. Opt. Soc. Am. B 39(1) 188-199 (2022)

Polarization-sensitive tunable multi-band terahertz absorber based on single-layered graphene rings

Peng Chen, Mingjun Tang, Aiyun Liu, Yishan Hu, Ling Li, Weidong Chen, Yarong Su, Yijia Huang, Jie Zheng, Ke Liu, and Zhengwei Xie
J. Opt. Soc. Am. B 38(10) 3000-3008 (2021)

Multiband tunable perfect metamaterial absorber realized by different graphene patterns

Yisong Lv, Jinping Tian, and Rongcao Yang
J. Opt. Soc. Am. B 38(8) 2409-2418 (2021)

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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

Tables (1)

You do not have subscription access to this journal. Article tables 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

Equations (10)

You do not have subscription access to this journal. Equations 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