Enhanced infrared detectors using resonant structures combined with thin type-II superlattice absorbers

被引：53

作者：

Goldflam, M. D. ^{[1
]}

Kadlec, E. A. ^{[1
]}

Olson, B. V. ^{[1
]}

Klem, J. F. ^{[1
]}

Hawkins, S. D. ^{[1
]}

Parameswaran, S. ^{[1
]}

Coon, W. T. ^{[1
]}

Keeler, G. A. ^{[1
]}

Fortune, T. R. ^{[1
]}

Tauke-Pedretti, A. ^{[1
]}

Wendt, J. R. ^{[1
]}

Shaner, E. A. ^{[1
]}

Davids, P. S. ^{[1
]}

Kim, J. K. ^{[1
]}

Peters, D. W. ^{[1
]}

机构：

[1] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

来源：

APPLIED PHYSICS LETTERS | 2016年 / 109卷 / 25期

关键词：

Efficiency - Infrared radiation - Nanoantennas - Fabry-Perot interferometers - Electromagnetic simulation;

D O I：

10.1063/1.4972844

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We examined the spectral responsivity of a 1.77 mu m thick type-II superlattice based long-wave infrared detector in combination with metallic nanoantennas. Coupling between the Fabry-Perot cavity formed by the semiconductor layer and the resonant nanoantennas on its surface enables spectral selectivity, while also increasing peak quantum efficiency to over 50%. Electromagnetic simulations reveal that this high responsivity is a direct result of field-enhancement in the absorber layer, enabling significant absorption in spite of the absorber's subwavelength thickness. Notably, thinning of the absorbing material could ultimately yield lower photodetector noise through a reduction in dark current while improving photocarrier collection efficiency. The temperature-and incident-angle-independent spectral response observed in these devices allows for operation over a wide range of temperatures and optical systems. This detector paradigm demonstrates potential benefits to device performance with applications throughout the infrared. Published by AIP Publishing.

引用

页数：5

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