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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 1 — Jan. 1, 2014
  • pp: 135–143

Subwavelength Bessel beams in wire media

Carlos J. Zapata-Rodríguez and Juan J. Miret  »View Author Affiliations


JOSA B, Vol. 31, Issue 1, pp. 135-143 (2014)
http://dx.doi.org/10.1364/JOSAB.31.000135


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Abstract

Recent progress is emerging on nondiffracting subwavelength fields propagating in complex plasmonic nanostructures. In this paper, we present a thorough discussion on diffraction-free localized solutions of Maxwell’s equations in a periodic structure composed of nanowires. This self-focusing mechanism differs from others previously reported, which lie on regimes with ultraflat spatial dispersion. By means of the Maxwell–Garnett model, we provide a general analytical expression of the electromagnetic fields that can propagate along the direction of the cylinder’s axis, keeping its transverse waveform unaltered. Numerical simulations based on the finite element method support our analytical approach. In particular, moderate filling fractions of the metallic composite lead to nonresonant-plasmonic spots of light propagating with a size that remains far below the limit of diffraction.

© 2013 Optical Society of America

OCIS Codes
(260.1960) Physical optics : Diffraction theory
(160.1245) Materials : Artificially engineered materials
(050.2065) Diffraction and gratings : Effective medium theory

ToC Category:
Physical Optics

History
Original Manuscript: September 5, 2013
Manuscript Accepted: November 11, 2013
Published: December 18, 2013

Citation
Carlos J. Zapata-Rodríguez and Juan J. Miret, "Subwavelength Bessel beams in wire media," J. Opt. Soc. Am. B 31, 135-143 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-1-135

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