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Title: Enhanced photoresponsivity of a germanium single-nanowire photodetector confined within a superwavelength metallic slit
Authors: Zhan, YH
Li, XF
Lei, DY 
Wu, SL
Wang, CH
Li, Y
Keywords: Single-nanowire photodetector
Metallic slit
Photodetector−light coupling
Superwavelength structure
Issue Date: 2014
Publisher: American Chemical Society
Source: ACS photonics, 2014, v. 1, no. 6, p. 483-488 How to cite?
Journal: ACS photonics 
Abstract: Single nanowire photodetectors (SNPDs) have recently gained much attention due to their unique photonic and electronic properties. We design a germanium SNPD confined inside a silver slit and demonstrate that properly engineering the slit into superwavelength scale is able to dramatically enhance the SNPD photoresponsivity to transverse electric incidence. The light absorption by this rationally designed device can be over 3.7 times that of its subwavelength counterpart based on plasmonic resonance under transverse magnetic incidence. An extensive investigation on polarization dependence, field profile, photon flux distribution, and azimuthal absorption pattern in the SNPD reveals that the underlying mechanism responsible for the significant performance enhancement is the optimal light–nanowire coupling, benefiting from strong interference-directed light concentration inside the slit cavity. This work provides us new insights, beyond the mostly studied plasmonic enhancement effects, into photoresponsivity optimization of SNPDs.
ISSN: 2330-4022
DOI: 10.1021/ph400129t
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