亮点论文:李孝峰组在ACS Photonics发表论文
时间: 2015-07-25  作者:   浏览次数: 352


李孝峰组在ACS Photonics发表论文

标题:EnhancedPhotoresponsivity of a Germanium Single-Nanowire Photodetector Confined withina Superwavelength Metallic Slit
作者:Yaohui Zhan, Xiaofeng Li*, Dang Yuan Lei, Shaolong Wu, Chinhua Wang, and Yao Li*
摘要:
Single nanowire photodetectors (SNPDs) have recentlygained much attention due to their unique photonic and electronic properties.We design a germanium SNPD confined inside a silver slit and demonstrate thatproperly engineering the slit into superwavelength scale is able todramatically enhance the SNPD photoresponsivity to transverse electricincidence. The light absorption by this rationally designed device can be over3.7 times that of its subwavelength counterpart based on plasmonic resonanceunder transverse magnetic incidence. An extensive investigation on polarizationdependence, field profile, photon flux distribution, and azimuthal absorptionpattern in the SNPD reveals that the underlying mechanism responsible for thesignificant performance enhancement is the optimal light�nanowire coupling,benefiting from strong interference-directed light concentration inside theslit cavity. This work provides us new insights, beyond the mostly studiedplasmonic enhancement effects, into photoresponsivity optimization of SNPDs.

原文链接:http://pubs.acs.org/doi/abs/10.1021/ph400129t