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학술지 Metal-VO2 Hybrid Grating Structure for a Terahertz Active Switchable Linear Polarizer
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저자
신준환, 문기원, 이의수, 이일민, 박경현
발행일
201508
출처
Nanotechnology, v.26 no.31, pp.1-7
ISSN
0957-4484
출판사
Institute of Physics (IOP)
DOI
https://dx.doi.org/10.1088/0957-4484/26/31/315203
협약과제
15ZE1100, ETRI 창의연구실 사업, 정성영
초록
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.
키워드
amplitude modulator, metal grating, phase transition, polarizer, terahertz wave, vanadium dioxide
KSP 제안 키워드
Amplitude Modulator, Degree of polarization, Grating structure, Linear polarizer, Optical conductivity, Phase transition, Spectral range, Terahertz (THz) wave, Terahertz wave, Transmission field, extinction ratio