Polarization-independent dual-band infrared perfect absorber based on a metal-dielectric-metal elliptical nanodisk array

Bingxin Zhang, Yanhui Zhao, Qingzhen Hao, Brian Kiraly, Iam Choon Khoo, Shufen Chen, Tony Jun Huang

Research output: Contribution to journalArticlepeer-review

237 Scopus citations

Abstract

We have designed and fabricated a dual-band plasmonic absorber in the near-infrared by employing a three-layer structure comprised of an elliptical nanodisk array on top of thin dielectric and metallic films. finite difference time domain (FDTD) simulations indicate that absorption efficiencies greater than 99% can be achieved for both resonance frequencies at normal incidence and the tunable range of the resonant frequency was modeled up to 700 nm by varying the dimensions of the three-layer, elliptical nanodisk array. The symmetry in our two-dimensional nanodisk array eliminates any polarization dependence within the structure, and the near-perfect absorption efficiency is only slightly affected by large incidence angles up to 50 degrees. Experimental measurements demonstrate good agreement with our simulation results.

Original languageEnglish (US)
Pages (from-to)15221-15228
Number of pages8
JournalOptics Express
Volume19
Issue number16
DOIs
StatePublished - Aug 1 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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