Abstract
In this paper we directly measure the refractive index and extinction coefficient of vanadium dioxide (VO2) in W-band (75-110 GHz) near the insulator-to-metal phase transition. A frequency-domain interferometry setup is used to obtain the transmission amplitude and phase shift of a transmitted wave though a 200 nm-thick VO2 film deposited on a silicon substrate. Using the transmission matrix technique, the measured data in the 58-100 °C temperature range are used to obtain the refractive index and extinction coefficient of VO2 as a function of temperature and frequency. The experimental results show a significant increase in the refractive index and extinction coefficient of VO2 beyond the transition temperature of ~68 °C.
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Acknowledgements
The authors gratefully acknowledge the financial support from Army Research Office Young Investigator Award (Contract # W911NF-12-1-0253), National Science Foundation (Contract # ECCS-1231314), National Science Foundation Career Award (Contract# ECCS-1139773), and National Science Foundation Graduate Research Fellowship Program (Award# DGE-0802267).
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Hashemi, M.R.M., Berry, C.W., Merced, E. et al. Direct Measurement of Vanadium Dioxide Dielectric Properties in W-band. J Infrared Milli Terahz Waves 35, 486–492 (2014). https://doi.org/10.1007/s10762-014-0065-0
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DOI: https://doi.org/10.1007/s10762-014-0065-0