用于波长选择性光电探测器的纳米线吸收体的光学设计。

Mokkapati S, Saxena D, Tan H H, Jagadish C

Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, A. C. T. 2601, Australia.

Sci Rep. 2015 Oct 15;5:15339. doi: 10.1038/srep15339.

We propose the optical design for the absorptive element of photodetectors to achieve wavelength selective photo response based on resonant guided modes supported in semiconductor nanowires. We show that the waveguiding properties of nanowires result in very high absorption efficiency that can be exploited to reduce the volume of active semiconductor compared to planar photodetectors, without compromising the photocurrent. We present a design based on a group of nanowires with varying diameter for multi-color photodetectors with small footprint. We discuss the effect of a dielectric shell around the nanowires on the absorption efficiency and present a simple approach to optimize the nanowire diameter-dielectric shell thickness for maximizing the absorption efficiency.

我们提出了用于光电探测器吸收元件的光学设计，以基于半导体纳米线中支持的共振导模实现波长选择性光响应。我们表明，纳米线的波导特性导致非常高的吸收效率，与平面光电探测器相比，可利用该效率在不影响光电流的情况下减少有源半导体的体积。我们提出了一种基于一组直径不同的纳米线的设计，用于小尺寸的多色光电探测器。我们讨论了纳米线周围电介质壳对吸收效率的影响，并提出了一种简单方法来优化纳米线直径 - 电介质壳厚度，以最大化吸收效率。