TY - JOUR
T1 - Significantly enhanced infrared absorption of graphene photodetector under surface-plasmonic coupling and polariton interference
AU - Zhang, Ye
AU - Meng, Dejia
AU - Li, Xiao
AU - Yu, Honghao
AU - Lai, Jianjun
AU - Fan, Zhaoyang
AU - Chen, Changhong
N1 - Publisher Copyright:
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
PY - 2018/11/12
Y1 - 2018/11/12
N2 - Here, we present a graphene-based long-wavelength infrared photodetector, for enhancing the infrared absorption of which the design consists of magnetic- and electric plasmon resonators of metasurface to excite the graphene surface-plasmonic polaritons (SPPs). Through tuning the graphene Fermi energy to achieve the distinct resonances in a matching frequency, peak graphene absorbance exceeding 67.2% is confirmed, even when a lossy dielectric is used, and the field angle of view is up to 90°. If the graphene is of a different carrier mobility, then the absorption frequency is lockable, and the device always can keep the system absorbance close to 100 percent. The significantly enhanced graphene absorbance, up to ~29-fold that of a suspended graphene (general 2.3%), is attributed to the surface-plasmonic coupling between the magnetic and the electric resonances, as well as Fabry-Pérot interference of the coherent SPPs. The plasmonic cavity-mode model and equivalent-circuit method developed in this study will also be useful in guiding other optoelectronic device design.
AB - Here, we present a graphene-based long-wavelength infrared photodetector, for enhancing the infrared absorption of which the design consists of magnetic- and electric plasmon resonators of metasurface to excite the graphene surface-plasmonic polaritons (SPPs). Through tuning the graphene Fermi energy to achieve the distinct resonances in a matching frequency, peak graphene absorbance exceeding 67.2% is confirmed, even when a lossy dielectric is used, and the field angle of view is up to 90°. If the graphene is of a different carrier mobility, then the absorption frequency is lockable, and the device always can keep the system absorbance close to 100 percent. The significantly enhanced graphene absorbance, up to ~29-fold that of a suspended graphene (general 2.3%), is attributed to the surface-plasmonic coupling between the magnetic and the electric resonances, as well as Fabry-Pérot interference of the coherent SPPs. The plasmonic cavity-mode model and equivalent-circuit method developed in this study will also be useful in guiding other optoelectronic device design.
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U2 - 10.1364/OE.26.030862
DO - 10.1364/OE.26.030862
M3 - Article
C2 - 30469978
AN - SCOPUS:85056905518
SN - 1094-4087
VL - 26
SP - 30862
EP - 30872
JO - Optics Express
JF - Optics Express
IS - 23
ER -