Highly efficient terahertz wave modulators by photo-excitation of organics/silicon bilayers

Authors
Yoo, Hyung KeunYoon, YoungwoonLee, KiejinKang, ChulKee, Chul-SikHwang, In-WookLee, Joong Wook
Issue Date
2014-07
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.105, no.1
Abstract
Using hybrid bilayer systems comprising a molecular organic semiconductor and silicon, we achieve optically controllable active terahertz (THz) modulators that exhibit extremely high modulation efficiencies. A modulation efficiency of 98% is achieved from thermally annealed C-60/silicon bilayers, due to the rapid photo-induced electron transfer from the excited states of the silicon onto the C-60 layer. Furthermore, we demonstrate the broadband modulation of THz waves. The cut-off condition of the system that is determined by the formation of efficient charge separation by the photo-excitation is highly variable, changing the system from insulating to metallic. The phenomenon enables an extremely high modulation bandwidth and rates of electromagnetic waves of interest. The realization of near-perfect modulation efficiency in THz frequencies opens up the possibilities of utilizing active modulators for THz spectroscopy and communications. (C) 2014 AIP Publishing LLC.
Keywords
TIME-DOMAIN SPECTROSCOPY; THIN-FILM TRANSISTORS; DOPED SILICON; THZ; METAMATERIALS; TECHNOLOGY; TRANSITION; MOBILITY
ISSN
0003-6951
URI
https://pubs.kist.re.kr/handle/201004/126609
DOI
10.1063/1.4887376
Appears in Collections:
KIST Article > 2014
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