Design of plasmonic photodetector with high absorptance and nano-scale active regions

Abstract

We propose a novel plasmonic photodetector with high responsivity, utilizing nano-scale active regions. This design can be applied to diverse materials (group III-V or IV materials) and different operation wavelengths covering the O-U bands. The periodic structure utilizing Surface Plasmon Polariton Bloch Waves (SPP-BWs) has low optical power loss. FDTD simulation shows an absorptance of 74.4% which means a responsivity of about 0.74 A/W at 1550 nm. The low capacitance brings low noise, reduced power consumption, and a high electrical bandwidth which is estimated to be 140 GHz. Among the plasmonic PDs with inherent high speeds but low responsivities, our design makes the obvious progress on improving the absorptance.

On the enhancement of light absorption in vanadium dioxide/1D photonic crystal composite nanostructures

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Perfect Dual-Band Absorber Based on Plasmonic Effect with the Cross-Hair/Nanorod Combination

“…A number of concerns has been focused on the investigation of designing perfect EM wave absorbers, given that the refractive index (RI) in plasmonic sensing design is a potential subject in nanophotonics [31][32][33][34][35][36]. The SPR properties corresponding to a tunable refractive index and resonance mode occurring in MNP-dielectric nanostructures are attractive for applying in many applications, such as plasmonic sensing [37], photovoltaics [38], spectroscopy [39], photodetection [40], recording [41], surface-enhanced Raman spectroscopy (SERS) [42], optical filters [43] and other adaptive photonic devices [44], which require high-performance perfect absorbers [45].…”

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“…Numerous photonic applications such as photodetectors, photovoltaics, sensors, light modulators, and camouflage systems rely on designing highly absorbent optical absorbers [1][2][3][4][5][6][7][8]. Therefore, the study of light absorption has recently attracted a great deal of research interest in the field of science and engineering.…”