期刊
OPTICA
卷 2, 期 9, 页码 790-796出版社
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.2.000790
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资金
- Army Research Office (ARO) [W911NF111029]
- Laboratory of Bio-photonics of Tomsk State University
- M.V. Lomonosov Moscow State University Program of Development
- Program of Introducing Talents to Universities on Photonics and Optoelectronics Science Technology [111 plan B07038]
- Russian Academy of Sciences (RAS) [1.II.2]
- Russian Foundation for Basic Research (RFBR) [12-03-31377, 14-02-00979, 14-22-01098, 15-29-01171, 15-32-20961]
- U.S. Army Research Laboratory (ARL)
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1229968] Funding Source: National Science Foundation
This paper describes research on the optics of functional materials, which can change their dielectric properties according to their function. Vanadium dioxide is a good example of such a material where the insulator-to-metal phase transition offers the possibility to control dielectric properties and to use them as a triggering element for photonic applications in the wide spectral range from optical to terahertz frequencies. We observed emission of terahertz (THz) radiation from VO2 films in insulating and conductive phase states under femtosecond pulse irradiation. We found that the efficiency of THz emission increases up to 30 times after the insulator-to-metal phase transition. This process occurs in thin films while it is fundamentally forbidden in the bulk material, and polarization analysis of the emitted radiation reveals the crucial importance of interface contributions. The properties of the THz radiation emitted by VO2 are determined by displacement photocurrents at the VO2-air and VO2-substrate interfaces induced by the incident laser light. In each phase state the contributions of the two boundaries are different. Properties of the effective dielectric susceptibility. chi((2)) tensor for the insulating phase were defined. In demonstrating the conversion of optical into THz radiation in VO2 films, we found that fundamental symmetry restrictions are not applicable to problems of nonlinear optics of thin films. (C) 2015 Optical Society of America
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