Abstract
The polarization state of light beams reflecting off thin layers of vanadium dioxide is measured as the material undergoes an insulator-metal phase transition by optical excitation. Under certain conditions, films as thin as 50 nm are shown to rotate linear polarization by 90° in reflection on the nanosecond and potentially shorter timescales. Possible applications for high-contrast optical modulation over a wide spectral range and high bandwidths are discussed.
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