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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 27 — Dec. 19, 2011
  • pp: 25990–25999

Efficient apertureless scanning probes using patterned plasmonic surfaces

Youngkyu Lee, Andrea Alu, and John X.J. Zhang  »View Author Affiliations

Optics Express, Vol. 19, Issue 27, pp. 25990-25999 (2011)

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We present a novel concept to design apertureless plasmonic probes for near-field scanning optical microscopy (NSOM) with enhanced optical power throughput and near-field enhancement. Specifically, we combine unidirectional surface plasmon polariton (SPP) generation along the tip lateral walls with nanofocusing of SPPs through adiabatic propagation towards an apertureless tip. Three key design parameters are considered: the nanoslit width, the pitch period of nanogrooves for unidirectional plasmonic excitation and the pyramidal geometry of the NSOM probe for SPP focusing. Optimal design parameters are obtained with 2D analysis and two realistic probe geometries with patterned plasmonic surfaces are proposed using the optimized designs. The electromagnetic properties of the designed probes are characterized in the near-field and compared to those of a conventional single-aperture probe with same pyramidal shape. The optimized probes feature FWHM around 150nm, comparable with conventional NSOM designs, but over 3 orders of magnitude larger field enhancement, without degrading its spatial resolution. Our ideas effectively combine the resolution of apertureless probes with throughput levels much larger than those available even in aperture-based devices.

© 2011 OSA

OCIS Codes
(180.4243) Microscopy : Near-field microscopy

ToC Category:

Original Manuscript: September 22, 2011
Revised Manuscript: October 15, 2011
Manuscript Accepted: October 17, 2011
Published: December 6, 2011

Virtual Issues
Vol. 7, Iss. 2 Virtual Journal for Biomedical Optics

Youngkyu Lee, Andrea Alu, and John X.J. Zhang, "Efficient apertureless scanning probes using patterned plasmonic surfaces," Opt. Express 19, 25990-25999 (2011)

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