Resonant cavity-enhanced photodetector incorporating a type-II superlattice to extend MWIR sensitivity.
Resonant cavity-enhanced photodetector incorporating a type-II superlattice to extend MWIR sensitivity.
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DOI：
10.1364/oe.27.023970
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发表时间：
2019-08
期刊：
影响因子：
3.8
通讯作者：
V. Letka;A. Bainbridge;A. Craig;F. Al-Saymari;A. Marshall
中科院分区：
文献类型：
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作者：
V. Letka;A. Bainbridge;A. Craig;F. Al-Saymari;A. Marshall
中红外共振腔增强型光电探测器(RCEPD)是一种很有前途的靶向气体探测技术。我们提出了一种以InAs/InAsSb超晶格为探测元件的RCEPD，将谐振波长扩展到4µm以上，并使用了AlAsSb/GaSb反射镜和平行于NBN结构的单极势垒有源区，并与传统的含有相同超晶格的宽带NBN探测器的性能进行了比较。RCEPD的Q因子为∼90，共振波长非常稳定。在240K下，峰值响应度为3.0A W-1，相当于84%的量子效率，比相同波长下的基准NbN提高了5.5倍。暗电流密度在240K时为3.3×10-2A cm-2，在180K时下降到2.7×10-4A cm-2，在180K时达到宽带光斑极限，比探测率为2.1×1011 cm Hz1/2W-1，这为实现热电致冷区的光斑限制提供了可能。
Mid-infrared resonant cavity-enhanced photodetectors (RCE PD) present a promising technology for targeted gas detection. We demonstrate an RCE PD incorporating an InAs/InAsSb superlattice as the detecting element, extending the resonant wavelength beyond 4 µm. AlAsSb/GaSb mirrors and a unipolar barrier active region paralleling an nBn structure are also used, and performance is compared to a conventional broadband nBn detector incorporating the same superlattice. The RCE PD exhibited a Q-factor of ∼90 and an extremely stable resonance wavelength. Peak responsivity was 3.0 A W-1 at 240 K, equalling 84% quantum efficiency, a 5.5 times increase over the reference nBn at the same wavelength. Dark current density was 3.3×10-2 A cm-2 at 240 K, falling to 2.7×10-4 A cm-2 at 180 K. The broadband BLIP limit is approached at 180 K with specific detectivity of 2.1×1011 cm Hz1/2 W-1, which presents the potential of achieving BLIP-limited operation in the thermoelectric cooling regime.