Nonequilibrium photon-induced hotspot: A new mechanism for photodetection in ultrathin metallic films

被引：70

作者：

Kadin, AM ^{[1
]}

Johnson, MW ^{[1
]}

机构：

[1] UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627

来源：

APPLIED PHYSICS LETTERS | 1996年 / 69卷 / 25期

关键词：

D O I：

10.1063/1.117576

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new class of photodetectors is proposed, based on localized heating of an ultrathin metallic film due to absorption of individual photons. For a 1 eV photon, the transient temperature rise can be of order 10 K or greater in a nonequilibrium ''hotspot'' on the nm spatial scale and ps timescale. If current is flowing in a metallic film with a temperature-dependent resistance, such a hotspot can give rise to a voltage pulse. This can provide the basis for an ultrafast photodetector with spectral sensitivity, in contrast to a conventional bolometer. Prospects for practical realization of infrared photodetectors based on this mechanism are discussed. (C) 1996 American Institute of Physics.

引用

页码：3938 / 3940

页数：3

共 9 条

[1] INTERACTION BETWEEN LIGHT AND SUPERCONDUCTORS [J].