Second-order surface-plasmon assisted responsivity enhancement in germanium nanophotodetectors with bull's eye antennas

Fang Fang Ren; Wei Zong Xu; Jiandong Ye; Kah Wee Ang; Hai Lu; Rong Zhang; Mingbin Yu; Guo Qiang Lo; Hark Hoe Tan; Chennupati Jagadish

doi:10.1364/OE.22.015949

Second-order surface-plasmon assisted responsivity enhancement in germanium nanophotodetectors with bull's eye antennas

Fang Fang Ren, Wei Zong Xu, Jiandong Ye, Kah Wee Ang, Hai Lu, Rong Zhang, Mingbin Yu, Guo Qiang Lo, Hark Hoe Tan, Chennupati Jagadish

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The enhancement of photo-response in nanometer-scale germanium photodetectors through bull's eye antennas capable of supporting 2nd-order Bloch surface plasmon modes is demonstrated in theory and experiment. A detailed numerical investigation reveals that the presence of surface wave and its constructive interference with the directly incident light are incorporated into the main mechanisms for enhancing transmission through the central nanoaperture. With a grating period of 1500 nm, the area-normalized responsivity can be enhanced up to 3.8 times at 2 V bias for a 780 nm laser. It provides an easier fabrication path for ultra-short wavelength operations especially in devices using optically denser materials.

Original language	English
Pages (from-to)	15949-15956
Number of pages	8
Journal	Optics Express
Volume	22
Issue number	13
DOIs	https://doi.org/10.1364/OE.22.015949
Publication status	Published - 30 Jun 2014

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title = "Second-order surface-plasmon assisted responsivity enhancement in germanium nanophotodetectors with bull's eye antennas",

abstract = "The enhancement of photo-response in nanometer-scale germanium photodetectors through bull's eye antennas capable of supporting 2nd-order Bloch surface plasmon modes is demonstrated in theory and experiment. A detailed numerical investigation reveals that the presence of surface wave and its constructive interference with the directly incident light are incorporated into the main mechanisms for enhancing transmission through the central nanoaperture. With a grating period of 1500 nm, the area-normalized responsivity can be enhanced up to 3.8 times at 2 V bias for a 780 nm laser. It provides an easier fabrication path for ultra-short wavelength operations especially in devices using optically denser materials.",

author = "Ren, {Fang Fang} and Xu, {Wei Zong} and Jiandong Ye and Ang, {Kah Wee} and Hai Lu and Rong Zhang and Mingbin Yu and Lo, {Guo Qiang} and Tan, {Hark Hoe} and Chennupati Jagadish",

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T1 - Second-order surface-plasmon assisted responsivity enhancement in germanium nanophotodetectors with bull's eye antennas

AU - Ren, Fang Fang

AU - Xu, Wei Zong

AU - Ye, Jiandong

AU - Ang, Kah Wee

AU - Lu, Hai

AU - Zhang, Rong

AU - Yu, Mingbin

AU - Lo, Guo Qiang

AU - Tan, Hark Hoe

AU - Jagadish, Chennupati

PY - 2014/6/30

Y1 - 2014/6/30

N2 - The enhancement of photo-response in nanometer-scale germanium photodetectors through bull's eye antennas capable of supporting 2nd-order Bloch surface plasmon modes is demonstrated in theory and experiment. A detailed numerical investigation reveals that the presence of surface wave and its constructive interference with the directly incident light are incorporated into the main mechanisms for enhancing transmission through the central nanoaperture. With a grating period of 1500 nm, the area-normalized responsivity can be enhanced up to 3.8 times at 2 V bias for a 780 nm laser. It provides an easier fabrication path for ultra-short wavelength operations especially in devices using optically denser materials.

AB - The enhancement of photo-response in nanometer-scale germanium photodetectors through bull's eye antennas capable of supporting 2nd-order Bloch surface plasmon modes is demonstrated in theory and experiment. A detailed numerical investigation reveals that the presence of surface wave and its constructive interference with the directly incident light are incorporated into the main mechanisms for enhancing transmission through the central nanoaperture. With a grating period of 1500 nm, the area-normalized responsivity can be enhanced up to 3.8 times at 2 V bias for a 780 nm laser. It provides an easier fabrication path for ultra-short wavelength operations especially in devices using optically denser materials.

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Second-order surface-plasmon assisted responsivity enhancement in germanium nanophotodetectors with bull's eye antennas

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