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Journal Article Metal-VO2 Hybrid Grating Structure for a Terahertz Active Switchable Linear Polarizer
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Authors
Jun-Hwan Shin, Kiwon Moon, Eui Su Lee, Il-Min Lee, Kyung Hyun Park
Issue Date
2015-08
Citation
Nanotechnology, v.26, no.31, pp.1-7
ISSN
0957-4484
Publisher
Institute of Physics (IOP)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1088/0957-4484/26/31/315203
Project Code
15ZE1100, ETRI 창의연구실 사업, Jung Sung Young
Abstract
An active terahertz (THz) wave hybrid grating structure of Au/Ti metallic grating on VO2/Al2O3 (0001) was fabricated and evaluated. In our structure, it is shown that the metallic gratings on the VO2 layer strengthen the metallic characteristics to enhance the contrast of the metallic and dielectric phases of a VO2-based device. Especially, the metal grating-induced optical conductivity of the device is greatly enhanced, three times more than that of a metallic phase of bare VO2 films in the 0.1-2.0 THz spectral range. As an illustrative example, we fabricated an actively on/off switchable THz linear polarizer. The fabricated device has shown commercially comparable values in degree of polarization (DOP) and extinction ratio (ER). A high value of 0.89 in the modulation depth (MD) for the transmission field amplitude, superior to other THz wave modulators, is achieved. The experimental results show that the fabricated device can be highly useful in many applications, including active THz linear polarizers, THz wave modulators and variable THz attenuators.
KSP Keywords
Degree of polarization, Grating structure, Linear polarizer, Optical conductivity, Spectral range, Terahertz (THz) wave, Transmission field, extinction ratio, field amplitude, metal grating, metallic grating