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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 3, Iss. 8 — Aug. 1, 2013
  • pp: 1101–1110

Rapid phase transition of a phase-change metamaterial perfect absorber

Tun Cao, Chenwei Wei, Robert E. Simpson, Lei Zhang, and Martin J. Cryan  »View Author Affiliations


Optical Materials Express, Vol. 3, Issue 8, pp. 1101-1110 (2013)
http://dx.doi.org/10.1364/OME.3.001101


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Abstract

Phase-change materials (PCMs) have great potential in applications for data storage, optical switching and tunable photonic devices. However, heating the whole of the phase change material at a high speed presents a key challenge. Here, for the first time, we model the incorporation of the phase-change material (Ge2Sb2Te5) within a metamaterial perfect absorber (MMPA) and show that the temperature of amorphous Ge2Sb2Te5 can be raised from room temperature to > 900K (melting point of Ge2Sb2Te5) in just a few nanoseconds with a low light intensity of 150 W/m2, owing to the enhanced light absorption through strong plasmonic resonances in the absorber. Our structure is composed of an array of thin gold (Au) squares separated from a continuous Au film by a Ge2Sb2Te5 layer. A Finite Element Method photothermal model is used to study the temporal variation of temperature in the Ge2Sb2Te5 layer. It is also shown that an absorber with a widely tunable spectrum can be obtained by switching between the amorphous and crystalline states of Ge2Sb2Te5. The study lowers the power requirements for photonic devices based on a thermal phase change and paves the way for the realization of ultrafast photothermally tunable photonic devices.

© 2013 OSA

OCIS Codes
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:
Metamaterials

History
Original Manuscript: April 11, 2013
Revised Manuscript: July 9, 2013
Manuscript Accepted: July 9, 2013
Published: July 17, 2013

Citation
Tun Cao, Chenwei Wei, Robert E. Simpson, Lei Zhang, and Martin J. Cryan, "Rapid phase transition of a phase-change metamaterial perfect absorber," Opt. Mater. Express 3, 1101-1110 (2013)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-3-8-1101


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