量子级联波长上转换系统红外响应特性研究
Study of response characteristics for cascade infrared up-conversion system
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摘要: 通过对波长上转换红外探测过程的分步测试和理论计算,对量子级联波长上转换器件与系统的红外响应特性进行了深入的研究。结果表明:量子级联波长上转换红外探测器件可以在较低的本底发光下实现较强的红外响应。上转换器件的响应度在平带偏压附近迅速增加,且红外光转换为上转换器件电流的线性度良好。对于波长上转换器件的近红外发光过程,文中应用ABC模型,获得了与测试结果非常一致的系统响应电流与电流转换效率,并合理地解释了波长上转换红外探测系统的非线性响应特征。Abstract: Through testing the detection process of infrared(IR) up-conversion step by step along with theoretical calculation, the IR response characteristics of the cascade IR up-converter(CIUP) and the whole up-conversion system were thoroughly studied. Test results show that CIUPs can achieve considerable IR responsivity under weak background luminescence. The responsivity of the CIUP rises very fast under the flat-band bias and the conversion process from IR light signal into CIUP's electrical signal displays excellent linearity. By applying the ABC model to the near-infrared radiation process of the CIUP, the fitted response current of the up-conversion system and the fitted current conversion efficiency agree well with the measured data, which gives a reasonable explanation for the non-linearity of the system's IR response.
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