Journal
OPTICS LETTERS
Volume 35, Issue 10, Pages 1506-1508Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.001506
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Funding
- Isik University [BAP-06A101]
- National Science Foundation (NSF) [EECS-0801985]
- Alexander von Humboldt Foundation at the University of Konstanz
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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. (C) 2010 Optical Society of America
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