Open AccessInverse design of multifunctional plasmonic metamaterial absorbers for infrared polarimetric imaging
Author(s) -
Junyu Li,
Li Bao,
Shengli Jiang,
Qiushi Guo,
Dehui Xu,
Bin Xiong,
Guangzu Zhang,
Fei Yi
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.008375
Subject(s) - metamaterial , polarimetry , optics , metamaterial absorber , plasmon , polarization (electrochemistry) , infrared , materials science , broadband , optoelectronics , absorption (acoustics) , extinction ratio , physics , scattering , tunable metamaterials , wavelength , chemistry
Metamaterial absorbers, consisting of assembling arrays of optical resonators with subwavelength dimensions and spacing, allow efficiently absorption electromagnetic radiation by leveraging the strong electrical and magnetic resonances. Beyond the enhanced absorption, there is a growing interest to realize multi-functional absorbers, for example, absorbers with extended bandwidth, strong polarization extinction ratio, to name a few. Traditionally, designing multi-functional absorbers require complex brute-force optimizations with sizable parameter space, which turn out to be rather inefficient. Here, using the particle swarm optimization algorithm, we design and experimentally demonstrate broadband and highly polarization selective mid-IR metal-insulator-metal absorbers, covering the technologically important 3-5 μm atmospheric transparency band. With spectrally averaged absorption exceeding 70%, a high polarization extinction ratio of 40.6 is concurrently achieved by the algorithm. We also investigate the incident angle dependence of the spectral absorption and clarify the origin of optical losses. By integrating with the growing range of mid-IR detectors and imagers, our devices can enable new applications such as mid-IR full Stokes imaging polarimetry for remote sensing.