Nonreciprocal switching of VO2 thin films on microstructured surfaces
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CitationKarakurt, I., Adams, C. H., Leiderer, P., Boneberg, J., & Haglund Jr, R. F. (2010). Nonreciprocal switching of VO2 thin films on microstructured surfaces. Optics Letters, 35(10), 1506-1508. doi:10.1364/OL.35.001506
We demonstrate that the combination of near-field focusing and a switchable oxide layer permits construction of a modulator with different optical switching thresholds in two opposing directions. For that purpose VO2 layers are deposited onto spherical micrometer-sized particles. The phase transition in VO2 is induced by a nanosecond-pulsed Nd:YAG laser from two different directions. The measured thresholds differ by a factor of 2.4, consistent with calculated differences in the intensities in the two directions.