Angular-dependent photodetection enhancement by a metallic circular disk optical antenna

作者：Kemsri Thitikorn; Gu Guiru; Zhang Yingjie; Lan Xing; Zhang Hualiang; Tice Jesse; Lu Xuejun^*

来源：AIP Advances, 2017, 7(2): 025013.

DOI：10.1063/1.4975705

In this paper, we analyze the plasmonic resonance excited by linearly polarized long-wave infrared (LWIR) planewaves in a metallic circular disk optical antenna(MCDA). The surface current distributions are simulated at different wavelengths, incident angles, and polarizations. The excited surface plasmonic resonance waves (SPRs) are different from the Bessel-type of SPR modes and closely resemble those in a monopole antenna. An MCDA coupled LWIR quantum dot infrared photodetector (QDIP) was fabricated and measured at different LWIR plane wave wavelengths and incident angles. A linear correlation between the enhancement ratio and the integrated square of the current is obtained, indicating the monopole antenna effect is a dominating factor for the plasmonic enhancement.

• 出版日期2017-2