Highly efficient terahertz wave modulators by photo-excitation of organics/silicon bilayers
- Authors
- Yoo, Hyung Keun; Yoon, Youngwoon; Lee, Kiejin; Kang, Chul; Kee, Chul-Sik; Hwang, In-Wook; Lee, 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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