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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 7 — Jul. 1, 2008
  • pp: 1096–1104

Confined optical field based on surface plasmon polaritons and the interactions with nanospheres

Qingyan Wang, Jia Wang, and Shulian Zhang  »View Author Affiliations


JOSA B, Vol. 25, Issue 7, pp. 1096-1104 (2008)
http://dx.doi.org/10.1364/JOSAB.25.001096


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Abstract

A type of surface-plasmon-polariton bandgap structure for generating a confined nanometric optical field with high intensity and very small sidelobes is simulated by using the finite-difference time-domain method. The numerical results show that the intensity enhancement of the confined field can reach 2 orders of magnitude, with a resolution (FWHM of the zero-order mode) of 0.33 λ and the high-order modes (sidelobes) being effectively suppressed to no more than 15%. These properties ensure the confined field to be used as a near-field source. Detailed and systematic investigations of the enhancement and the localization versus the structure parameters are performed, and the physical mechanisms behind these phenomena are explained. Potential applications of the confined field in near-field detection and imaging are discussed through interactions with different types of nanospheres. The simulated results reveal that details with feature sizes down to 0.13 λ can be resolved.

© 2008 Optical Society of America

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Optics at Surfaces

History
Original Manuscript: December 18, 2007
Revised Manuscript: March 14, 2008
Manuscript Accepted: April 22, 2008
Published: June 2, 2008

Citation
Qingyan Wang, Jia Wang, and Shulian Zhang, "Confined optical field based on surface plasmon polaritons and the interactions with nanospheres," J. Opt. Soc. Am. B 25, 1096-1104 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-7-1096

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