期刊
ACS PHOTONICS
卷 5, 期 8, 页码 3040-3050出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00276
关键词
insulator-metal phase transition; coupling mode; phase shift; terahertz; vanadium dioxide
类别
资金
- National Natural Science Foundation of China [61270011, 91438118, 61741121, 61501094]
- National Key Basic Research Program of China [2014CB339806]
- Program for New Century Excellent Talents in University of Ministry of Education of China [NECT_13_0100]
- Sichuan Youth Science and Technology Foundation [2014JQ0013]
Utilizing terahertz (THz) waves to transmit data for communication and imaging places high demands on phase modulation. However, until now, it is difficult to realize a more than 100 phase shift in the transmission mode with one-layer structure. In this paper, a ring-dumbbell composite resonator nested with VO2 nanostructures is proposed to achieve the large phase shift. It is found that in this structure a hybrid mode with an enhanced resonant intensity, which is coupled by the L-C resonance and dipole resonance has been observed. Applying the photoinduced phase transition characteristics of VO2, the resonant intensity of the mode can be dynamically controlled, which leads to a large phase shift in the incident THz wave. The dynamic experimental results show that controlling the power of the external laser can achieve a phase shift of up to 138 degrees near 0.6 THz using this one-layer VO2 nested composite structure. Moreover, within a 55 GHz (575-630 GHz) bandwidth, the phase shift exceeds 130 degrees. This attractive phase shift modulation may provide prospective applications in THz imaging, communications, and so on.
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