Broadband coherent perfect absorber with PT-symmetric 2D-materials

Sarisaman M., Tas M.

ANNALS OF PHYSICS, cilt.401, ss.139-148, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 401
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.aop.2018.12.008
  • Dergi Adı: ANNALS OF PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.139-148
  • Anahtar Kelimeler: Coherent perfect absorption, Spectral singularity, PT symmetry, Graphene, Weyl semimetal, 2D material, REFRACTIVE-INDEX, GRAPHENE, ABSORPTION
  • İstanbul Üniversitesi Adresli: Evet

Özet

We suggest graphene and a two-dimensional (2D) Weyl semimetal (WSM) as 2D materials for the realization of a broadband coherent perfect absorber (CPA) respecting overall PT-symmetry. We also demonstrate the conditions for mutually equal amplitudes and phases of the left and right incoming waves to realize a CPA. 2D materials in our system play the role to enhance the absorption rate of a CPA once the appropriate parameters are inserted in the system. We show that a 2D WSM is more effective than graphene in obtaining the optimal conditions. We display the behavior of each parameter governing the optical system and show that optimal conditions of these parameters give rise to enhancement and possible experimental realization of a broadband CPA-laser. (C) 2019 Elsevier Inc. All rights reserved.