Abstract

We propose a thin, compact, broadband, polarization and angle insensitive metamaterial absorber based on a tungsten reflector, a silicon spacer, and a top pattern composed of a double square-like ring resonator utilizing nickel (Ni). In such a structure, a high absorption (above 80%) bandwidth ${\sim}{4.8}\;\unicode{x00B5}{\rm m}$ from 3.52 up to 8.32 µm corresponding to the relative bandwidth ${\sim}{81}\%$ can be achieved with deeply subwavelength unit cell dimensions. Here the physical origin of the broadband absorption is associated with low $ Q $-factor dipole modes of the top pattern inner and outer sides functioning as rectangular nanoantennas. Owing to the structural symmetry, the absorber shows a good incidence angle tolerance in the relatively wide range for both transverse electric and transverse magnetic polarizations. The effective parameters of the Ni-based absorber were retrieved using the constitutive effective medium theory, and the absorption characteristics of the effective medium and metamaterial were compared.

© 2020 Optical Society of America

Full Article  |  PDF Article
More Like This
Small–sized long wavelength infrared absorber with perfect ultra–broadband absorptivity

Yu Zhou, Zhongzhu Liang, Zheng Qin, Enzhu Hou, Xiaoyan Shi, Yuhao Zhang, Ying Xiong, Yinhui Tang, Yandong Fan, Fuming Yang, Jingqiu Liang, Changhong Chen, and Jianjun Lai
Opt. Express 28(2) 1279-1290 (2020)

Design of an ultra-broadband near-perfect bilayer grating metamaterial absorber based on genetic algorithm

Haoyuan Cai, Yi Sun, Xiaoping Wang, and Shuyue Zhan
Opt. Express 28(10) 15347-15359 (2020)

Broadband near-infrared TiO2 dielectric metamaterial absorbers

Yanhong Zhu, Tian Lan, Pinwei Liu, and Jiaqi Yang
Appl. Opt. 58(26) 7134-7138 (2019)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (6)

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

Contact your librarian or system administrator
or
Login to access OSA 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 OSA member, or as an authorized user of your institution.

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

Equations (2)

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

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

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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