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Free-field characterization via directional transmission through a nanoaperture

Jussi Rahomäki1*, Heikki J Hyvärinen2, Shakil Rehman34 and Jari Turunen1

Author Affiliations

1 Department of Physics and Mathematics, University of Eastern Finland, P.O. Box 111, Joensuu FI-80101, Finland

2 Rocsole Ltd, Microkatu 1, P.O. Box 1188, Kuopio FI-70211, Finland

3 Department of Bioengineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117574, Singapore

4 Singapore-MIT Alliance for Research and Technology, 3 Science Drive 2, Singapore 117543, Singapore

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Nanoscale Research Letters 2013, 8:326  doi:10.1186/1556-276X-8-326

Published: 16 July 2013


We propose a scheme based on extraordinary transmission of light through a single nanoaperture, surrounded by periodic corrugations, for direct characterization of focal-region optical fields with subwavelength-scale structure. We describe the design of the device on the basis of rigorous diffraction theory and fabricate a prototype using a process that involves electron beam lithography, dry etching, and template stripping. First experimental results performed with a transmission-type confocal optical microscope demonstrate the potential of the method.

Fourier modal method; Subwavelength aperture; Field probe; Extraordinary optical transmission