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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15401–15408

Intrinsic linewidth of the plasmonic resonance in a micrometric metal mesh

L. Baldassarre, M. Ortolani, A. Nucara, P. Maselli, A. Di Gaspare, V. Giliberti, and P. Calvani  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15401-15408 (2013)

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The intrinsic linewidth and angular dispersion of Surface Plasmon Polariton resonance of a micrometric metal mesh have been measured with a collimated mid-infrared beam, provided by an External Cavity tunable Quantum Cascade Laser. We show that the use of a collimated beam yields an observed resonance linewidth γ = 12 cm−1 at the resonance frequency ν0 = 1658 cm−1, better by an order of magnitude than with a non-collimated beam. The extremely narrow plasmon resonance attained by our mesh is then exploited to reconstruct, by varying the QCL angle of incidence θ, the angular intensity distribution f(θ) of a globar at the focal plane of a conventional imaging setup. We thus show that f(θ) is better reproduced by a Gaussian distribution than by a uniform one, in agreement with ray-tracing simulation.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3060) Physical optics : Infrared
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

Original Manuscript: April 11, 2013
Revised Manuscript: May 17, 2013
Manuscript Accepted: May 24, 2013
Published: June 20, 2013

L. Baldassarre, M. Ortolani, A. Nucara, P. Maselli, A. Di Gaspare, V. Giliberti, and P. Calvani, "Intrinsic linewidth of the plasmonic resonance in a micrometric metal mesh," Opt. Express 21, 15401-15408 (2013)

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