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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 3 — Feb. 1, 2013
  • pp: 272–274

Optics InfoBase > Optics Letters > Volume 38 > Issue 3 > Page 272

Metamaterial saturable absorber mirror

Govind Dayal and S. Anantha Ramakrishna  »View Author Affiliations


Optics Letters, Vol. 38, Issue 3, pp. 272-274 (2013)
http://dx.doi.org/10.1364/OL.38.000272


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Abstract

We propose a metamaterial saturable absorber mirror at midinfrared wavelengths that can show a saturation of absorption with intensity of incident light and switch to a reflecting state. The design consists of an array of circular metallic disks separated by a thin film of vanadium dioxide (VO2) from a continuous metallic film. The heating due to the absorption in the absorptive state causes the VO2 to transit to a metallic phase from the low temperature insulating phase. The metamaterial switches from an absorptive state (R≃0.1%) to a reflective state (R>95%) for a specific threshold intensity of the incident radiation corresponding to the phase transition of VO2, resulting in the saturation of absorption in the metamaterial. The computer simulations show over 99.9% peak absorbance, a resonant bandwidth of about 0.8 μm at 10.22 μm wavelengths, and saturation intensity of 140  mW cm−2 for undoped VO2 at room temperature. We also carried out numerical simulations to investigate the effects of localized heating and temperature distribution by solving the heat diffusion problem.

© 2013 Optical Society of America

OCIS Codes
(140.3540) Lasers and laser optics : Lasers, Q-switched
(230.4040) Optical devices : Mirrors
(260.3060) Physical optics : Infrared
(160.3918) Materials : Metamaterials

ToC Category:
Materials

History
Original Manuscript: September 18, 2012
Manuscript Accepted: December 12, 2012
Published: January 16, 2013

Citation
Govind Dayal and S. Anantha Ramakrishna, "Metamaterial saturable absorber mirror," Opt. Lett. 38, 272-274 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-3-272

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