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Intersubband absorption and infrared photodetection at 3.5 and 4.2 &mgr;m in GaAs quantum wells

 

作者: Harald Schneider,   Frank Fuchs,   Bernhard Dischler,   John D. Ralston,   Peter Koidl,  

 

期刊: Applied Physics Letters  （AIP Available online 1991）
卷期: Volume 58, issue 20  

页码: 2234-2236

 

ISSN:0003-6951

 

年代: 1991

 

DOI:10.1063/1.104936

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We propose and demonstrate a novel concept for intersubband detectors at operating wavelengths of 3–5 &mgr;m using GaAs quantum wells. An extremely large intersubband spacing is obtained by using ultrathin AlAs barriers on either side of the GaAs quantum wells followed by a thicker Al0.3Ga0.7As layer. Simultaneously, the confining AlAs layers act as tunnel barriers which allow an electrical detection of the intersubband excitation.

 

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