Ultra-wide Spectral Bandwidth and Enhanced Absorption in a Metallic Compound Grating Covered by Graphene Monolayer

Nghia Nguyen-Huu, Jaromír Pištora, Michael Cada, Trung Nguyen-Thoi, Youqiao Ma, Kiyotoshi Yasumoto, B. M. Azizur Rahman, Qiang Wu, Yuan Ma, Quang Hieu Ngo, Lin Jie, Hiroshi Maeda

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
48 Downloads (Pure)

Abstract

Graphene, a two-dimensional monatomic layer of carbon material, has demonstrated as a good candidate for applications of ultrafast photodetectors, transistors, transparent electrodes, and biosensors. Recently, many studies have shown that using metallic deep gratings could enhance the absorptance of graphene of 2.3% up to 80% in the near infrared region for applications in photon detection. This paper presents utilizing a nanograting structure, namely, a compound metallic grating could greatly enhance the absorptance of graphene up to 98% and widen its spectral bandwidth to 0.6 μm, which are greater than those of previous work. The study also showed that the absorptance spectrum is insensitive to angles of incidence. Furthermore, the proposed graphene-covered compound grating might bring a lot of benefits for graphene designs-based optical and optoelectronic devices.

Original languageEnglish
Article number9054975
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume27
Issue number1
Early online date2 Apr 2020
DOIs
Publication statusPublished - 1 Jan 2021

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