Polarization-insensitive hot-electron infrared photodetection by double Schottky junction and multilayer grating

Optics Letters
Qiaoping ZhangXiaofeng Li

Abstract

Infrared photodetection based on hot electrons is drawing increasing interest due to the capabilities of below-bandgap detection, high tunability of working wavelength, compact size, and room-temperature operation. However, conventional hot-electron photodetectors are mostly based on surface plasmons with a strong polarization preference. In this Letter, we propose a multilayer grating double-junction hot-electron photodetector by introducing an ultrathin Au layer sandwiched between two Au-Si-Au cavities. The multilayer grating system allows the excitation of the guided-mode resonance that shows a weak reliance on the incident polarization and, therefore, realizes the polarization-insensitive optical absorption up to 98%. The special multilayer design facilitates hot-electron generation in the ultrathin Au layers with high carrier transport efficiency, as well as enabling the formation of a double Schottky junction, which doubles the carrier emission probability. The optical and electrical benefits ensure a polarization-independent photoresponsivity ∼1  mA/W at the wavelength of 1470 nm.

References

Jul 11, 2000·Journal of Agricultural and Food Chemistry·H B Ding, R J Xu
Oct 26, 2011·Nano Letters·Fuming Wang, Nicholas A Melosh
Mar 29, 2013·Nature Communications·Ali SobhaniNaomi J Halas
Apr 3, 2013·Optics Express·Fatih B AtarAli K Okyay
Feb 8, 2014·Nano Letters·Hamidreza ChalabiMark L Brongersma
Mar 17, 2016·ACS Nano·Charlene NgDaniel E Gomez
Jan 25, 2017·ACS Nano·Cheng ZhangXiaofeng Li

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