Tunable and broadband coherent perfect absorption by ultrathin black phosphorus metasurfaces

Tianjing Guo, Christos Argyropoulos

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Black phosphorus (BP), a relatively new plasmonic two-dimensional material, offers unique photonic and electronic properties. In this work, we propose a new tunable and broadband ultrathin coherent perfect absorber (CPA) device operating in the terahertz (THz) frequency range. It is based on a bifacial metasurface made of BP patch periodic arrays separated by a thin dielectric layer. Broadband CPA bandwidth is realized due to the ultrathin thickness of the proposed device and the extraordinary properties of BP. In addition, a substantial modulation between CPA and complete transparency is achieved by adjusting the phase difference between the two counterpropagating incident waves. The CPA performance can be tuned by dynamically changing the electron doping level of BP. The CPA response under normal and oblique transverse magnetic and electric polarized incident waves is investigated. It is derived that CPA can be achieved under both incident polarizations and across a broad range of incident angles. The presented CPA device can be used in the design of tunable planar THz modulators, all-optical switches, detectors, and signal processors.

Original languageEnglish (US)
Pages (from-to)2962-2971
Number of pages10
JournalJournal of the Optical Society of America B: Optical Physics
Volume36
Issue number11
DOIs
StatePublished - 2019

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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