Theoretical Analysis and Experimental Measurement on the Response Time of Optical Switch Based on VO2 Thin Film

In this paper, the physical thermal model for a typical optical switch based on VO₂ thin film is built, according to which the response time parameter expression of the optical switch is obtained in theory. The expression of the response time parameter reveals key factors relevant to the switching speed of optical switch based on VO₂ thin film and theoretically gives directions to improve the switching speed of this kind of optical switch. Furthermore, the proposed measurement means of response time parameter can be utilized to practical measure and test on optical switch.