Bias field tailored plasmonic nano-electrode for high-power terahertz photonic devices

Scientific Reports
Kiwon MoonKyung Hyun Park

Abstract

Photoconductive antennas with nano-structured electrodes and which show significantly improved performances have been proposed to satisfy the demand for compact and efficient terahertz (THz) sources. Plasmonic field enhancement was previously considered the dominant mechanism accounting for the improvements in the underlying physics. However, we discovered that the role of plasmonic field enhancement is limited and near-field distribution of bias field should be considered as well. In this paper, we clearly show that the locally enhanced bias field due to the size effect is much more important than the plasmonic enhanced absorption in the nano-structured electrodes for the THz emitters. Consequently, an improved nano-electrode design is presented by tailoring bias field distribution and plasmonic enhancement. Our findings will pave the way for new perspectives in the design and analysis of plasmonic nano-structures for more efficient THz photonic devices.

References

Mar 6, 2003·Nature Materials·Bradley Ferguson, Xi-Cheng Zhang
Dec 1, 2006·Nature·Hou-Tong ChenRichard D Averitt
Aug 15, 1995·Optics Letters·B B Hu, M C Nuss
Jul 15, 1996·Optics Letters·G Rodriguez, A J Taylor
Feb 22, 2012·ACS Nano·Sang-Gil ParkKi-Hun Jeong
Nov 23, 2012·Nano Letters·Barmak HeshmatThomas Edward Darcie
Nov 18, 2014·Optics Express·Afshin JoosheshReuven Gordon
Apr 4, 2015·Optics Express·Il-Min LeeKyung Hyun Park

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Methods Mentioned

BETA
PCAs
PCA
electron-beam

Software Mentioned

Comsol Multiphysics
Comsol

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