Photo-Thermoelectric Conversion of Plasmonic Nanohole Array
Photo-Thermoelectric Conversion of Plasmonic Nanohole Array
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DOI：
10.3390/app10082681
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发表时间：
2020-02-01
影响因子：
2.7
通讯作者：
Kubo, Wakana
中科院分区：
文献类型：
--
作者：
Miwa, Kaito;Ebihara, Hiroki;Kubo, Wakana
等离子体光电转换提供了一种不受半导体带隙限制的替代光电探测机制。在这里，我们报告了一个等离子体激元光电探测器组成的超薄银膜与纳米孔阵列，其光电探测机制是基于热电转换等离子体激元局部加热触发。检测器在表面等离子体激元的波长处表现出最大光电流，这由纳米孔的周期性确定。因此，可以通过纳米孔图案的形态参数来控制检测器的响应波长。等离子体激元局部加热对热电转换的贡献得到了实验和数值验证，从而可以讨论光检测的机制。这些结果为其他纳米级光电探测器的开发提供了一个起点。
Plasmonic photo-thermoelectric conversion offers an alternative photodetection mechanism that is not restricted by semiconductor bandgaps. Here, we report a plasmonic photodetector consisting of an ultra-thin silver film with nanohole array, whose photodetection mechanism is based on thermoelectric conversion triggered by plasmonic local heating. The detector exhibits a maximum photocurrent at the wavelength of the surface plasmon polaritons, determined by the periodicity of the nanoholes. Hence, the response wavelength of the detector can be controlled via the morphological parameters of the nanohole pattern. The contribution of plasmonic local heating to thermoelectric conversion is verified experimentally and numerically, enabling discussion on the mechanisms governing light detection. These results provide a starting point for the development of other nanoscale photodetectors.