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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6472–6477

Teardrop-shaped surface-plasmon resonators

Majid Rasouli Disfani, Mohammad Sadegh Abrishamian, and Pierre Berini  »View Author Affiliations

Optics Express, Vol. 20, Issue 6, pp. 6472-6477 (2012)

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A new surface plasmon resonator, in the form of a metal cylinder shaped like a teardrop, is proposed and modeled using hypersingular integral equations. Illuminating the apex of the teardrop along its axis of symmetry with TM-polarised light excites equal-magnitude surface plasmons counter-propagating around its periphery. Interference of these counter-propagating surface plasmons leads to resonant modes having very sharp line-widths (~0.6 nm) and large quality factors (~3400). In water, a Au teardrop supports resonant modes having large bulk sensitivities (~1900 nm/RIU) and remarkably large figures-of-merit (~1700), about 1000 × larger than the figure-of-merit of, e.g., isolated Au nano-spheres. The scattering cross-section of the structure near resonant modes exhibits a Fano-like line-shape. The teardrop should find applications as a high-quality surface plasmon resonator or as a biosensing element.

© 2012 OSA

OCIS Codes
(230.5750) Optical devices : Resonators
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: January 23, 2012
Revised Manuscript: February 14, 2012
Manuscript Accepted: February 28, 2012
Published: March 5, 2012

Majid Rasouli Disfani, Mohammad Sadegh Abrishamian, and Pierre Berini, "Teardrop-shaped surface-plasmon resonators," Opt. Express 20, 6472-6477 (2012)

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