TY - JOUR
T1 - Ultra-wide Spectral Bandwidth and Enhanced Absorption in a Metallic Compound Grating Covered by Graphene Monolayer
AU - Nguyen-Huu, Nghia
AU - Pištora, Jaromír
AU - Cada, Michael
AU - Nguyen-Thoi, Trung
AU - Ma, Youqiao
AU - Yasumoto, Kiyotoshi
AU - Rahman, B. M. Azizur
AU - Wu, Qiang
AU - Ma, Yuan
AU - Ngo, Quang Hieu
AU - Lin, Jie
AU - Maeda, Hiroshi
PY - 2021/1/1
Y1 - 2021/1/1
N2 - 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.
AB - 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.
KW - Graphene
KW - numerical analysis
KW - optoelectronic devices
KW - photodetectors
KW - subwavelength gratings
UR - http://www.scopus.com/inward/record.url?scp=85083016337&partnerID=8YFLogxK
U2 - 10.1109/jstqe.2020.2984559
DO - 10.1109/jstqe.2020.2984559
M3 - Article
SN - 1077-260X
VL - 27
JO - IEEE Journal on Selected Topics in Quantum Electronics
JF - IEEE Journal on Selected Topics in Quantum Electronics
IS - 1
M1 - 9054975
ER -