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2015 ; 5
(ä): 12536
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High-power THz to IR emission by femtosecond laser irradiation of random 2D
metallic nanostructures
#MMPMID26205611
Zhang L
; Mu K
; Zhou Y
; Wang H
; Zhang C
; Zhang XC
Sci Rep
2015[Jul]; 5
(ä): 12536
PMID26205611
show ga
Terahertz (THz) spectroscopic sensing and imaging has identified its potentials
in a number of areas such as standoff security screening at portals, explosive
detection at battle fields, bio-medical research, and so on. With these needs,
the development of an intense and broadband THz source has been a focus of THz
research. In this work, we report an intense (~10?mW) and ultra-broadband
(~150?THz) THz to infrared (IR) source with a Gaussian wavefront, emitted from
nano-pore-structured metallic thin films with femtosecond laser pulse excitation.
The underlying mechanism has been proposed as thermal radiation. In addition, an
intense coherent THz signal was generated through the optical rectification
process simultaneously with the strong thermal signal. This unique feature opens
up new avenues in biomedical research.