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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2346–2353

Liquid metal-based plasmonics

Jinqi Wang, Shuchang Liu, Z. Valy Vardeny, and Ajay Nahata  »View Author Affiliations

Optics Express, Vol. 20, Issue 3, pp. 2346-2353 (2012)

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We demonstrate that liquid metals support surface plasmon-polaritons (SPPs) at terahertz (THz) frequencies, and can thus serve as an attractive material system for a wide variety of plasmonic and metamaterial applications. We use eutectic gallium indium (EGaIn) as the liquid metal injected into a polydimethylsiloxane (PDMS) mold fabricated by soft lithography techniques. Using this approach, we observe enhanced THz transmission through a periodic array of subwavelength apertures. Despite of the fact that the DC conductivity of EGaIn is an order of magnitude smaller than many conventional metals, we clearly observe well-defined transmission resonances. This represents a first step in developing reconfigurable and tunable plasmonic devices that build upon well-developed microfluidic capabilities.

© 2012 OSA

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(160.3900) Materials : Metals
(240.6680) Optics at surfaces : Surface plasmons
(260.3090) Physical optics : Infrared, far

ToC Category:
Optics at Surfaces

Original Manuscript: December 2, 2011
Revised Manuscript: January 3, 2012
Manuscript Accepted: January 10, 2012
Published: January 18, 2012

Jinqi Wang, Shuchang Liu, Z. Valy Vardeny, and Ajay Nahata, "Liquid metal-based plasmonics," Opt. Express 20, 2346-2353 (2012)

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