MoS$_2$ Broadband Coherent Perfect Absorber for Terahertz Waves

• Main Authors: Weiren Zhu, Fajun Xiao, Ming Kang, Debabrata Sikdar, Xianling Liang, Junping Geng, Malin Premaratne, Ronghong Jin
• Format: Article
• Language: English
• Published: IEEE 2016-01-01
• Series: IEEE Photonics Journal
• Subjects: Coherent perfect absorber; broadband; MoS<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">2</sub>
• Online Access: https://ieeexplore.ieee.org/document/7762817/
• ISSN: 1943-0655

We present a comprehensive analysis of terahertz waves propagation through a bulk MoS₂ crystal slab. It is shown that broadband coherent perfect absorption can be achieved and the coherent absorptivity can be adjusted from 1.57% to 99.97% by means of phase modulation. Moreover, the relative bandwidth for over 90% coherent absorptivity can be as wide as 179%. By increasing the doping rate in MoS₂ crystal, the coherent absorptivity spectrum exhibits a clear blueshift whilst the peak coherent absorptivity remains over 99.9%. Full-wave numerical simulations are further carried out to confirm the validity of our theoretical analysis.