Open AccessWide-angle broadband absorption in tapered patch antennas
Author(s) -
Lu Liu,
Hao Peng,
Yang Pu,
Xiangxiao Ying,
Zhe Li,
Jimmy Xu,
Yadong Jiang,
Zhijun Liu
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.001064
Subject(s) - optics , materials science , omnidirectional antenna , broadband , strips , absorption (acoustics) , bandwidth (computing) , optoelectronics , terahertz radiation , antenna (radio) , physics , telecommunications , computer science , composite material
Strip array is a classical antenna structure, which provides an effective way to generate and explore new material properties and device functionalities. In this paper, we demonstrate wide-angle broadband absorption in patch antennas made of tapered strip arrays in the metal-insulator-metal geometry. By superimposing multiple resonances associated with the tapered width of the strips, near-perfect absorption is designed and realized over a wide bandwidth from 29.2 THz to 38 THz with efficiency exceeding 80% in the mid-infrared region. The strong absorption band is insensitive to incident angles up to 75°. The angle-independent absorption is attributed to the unique mechanism of coupling between relevant magnetic resonances and free-space incident light. Our tapered patch antenna design offers the advantage of simplicity, and therefore flexibility in engineering natural materials for strong omnidirectional absorption with a variable and wide bandwidth, which could be of interest in applications such as bolometric sensing, camouflaging, and spectral filtering.