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Title: Bi-directional terahertz-to-infrared emission from metal-coated nanostructures upon femtosecond laser irradiation
Authors: Zhang, L
Wu, T
Zhao, J
Zhang, C
Zhang, XC
Issue Date: 2015
Publisher: Optical Society of America
Source: Optics express, 2015, v. 23, no. 19, p. 25202-25208 How to cite?
Journal: Optics express 
Abstract: We report on the investigation of bi-directional terahertz-toinfrared (THz-to-IR) radiation from a metal film coated on a substrate with randomly ordered pore arrays by irradiation of femtosecond laser pulses. THz-to-IR radiation was observed both for front-side excitation (laser incident on the metal surface) and for rear-side excitation (laser incident on the substrate). In both cases, the radiation was observed both in the propagation direction of the laser beam and in the reverse direction. Considering these findings, we propose a thermal emission mechanism based on the production of surface plasmons, either delocalized (through phase-matched excitation) or localized (through surface roughness) at the air/metal and metal/substrate interfaces.
EISSN: 1094-4087
DOI: 10.1364/OE.23.025202
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