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

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 mu m, 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.

Automated summary

Graphene has shown great potential in applications such as ultrafast photodetectors and transistors, with metallic deep gratings enhancing its absorptance up to 80% in the near infrared region. Utilizing a compound metallic grating structure can further enhance graphene's absorptance to 98% and expand its spectral bandwidth to 0.6 μm, demonstrating high design potential for optical and optoelectronic devices based on graphene.