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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15205–15212

Tunable subwavelength hot spot of dipole nanostructure based on VO2 phase transition

Jun-Bum Park, Il-Min Lee, Seung-Yeol Lee, Kyuho Kim, Dawoon Choi, Eui Young Song, and Byoungho Lee  »View Author Affiliations


Optics Express, Vol. 21, Issue 13, pp. 15205-15212 (2013)
http://dx.doi.org/10.1364/OE.21.015205


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Abstract

We propose a novel approach to generate and tune a hot spot in a dipole nanostructure of vanadium dioxide (VO2) laid on a gold (Au) substrate. By inducing a phase transition of the VO2, the spatial and spectral distributions of the hot spot generated in the feed gap of the dipole can be tuned. Our numerical simulation based on a finite-element method shows a strong intensity enhancement difference and tunability near the wavelength of 678 nm, where the hot spot shows 172-fold intensity enhancement when VO2 is in the semiconductor phase. The physical mechanisms of forming the hot spots at the two-different phases are discussed. Based on our analysis, the effects of geometric parameters in our dipole structure are investigated with an aim of enhancing the intensity and the tunability. We hope that the proposed nanostructure opens up a practical approach for the tunable near-field nano-photonic devices.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: April 15, 2013
Revised Manuscript: May 25, 2013
Manuscript Accepted: June 11, 2013
Published: June 18, 2013

Citation
Jun-Bum Park, Il-Min Lee, Seung-Yeol Lee, Kyuho Kim, Dawoon Choi, Eui Young Song, and Byoungho Lee, "Tunable subwavelength hot spot of dipole nanostructure based on VO2 phase transition," Opt. Express 21, 15205-15212 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-13-15205


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