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Journal of Nanophotonics

Increased light gathering capacity of sub-wavelength conical metallic apertures
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Paper Abstract

We study light transmission through individual and arrays of sub-wavelength metallic apertures of conical shape as a function of their taper angle. With a fixed aperture size at the substrate, there is a dramatic increase in light throughput with increasing taper angle. Similar behaviors hold when considering the intensity enhancement inside the aperture near the substrate interface, where more than four-fold increase can be obtained. When arranged in regular arrays, apertures can interact via surface waves, creating distinct minima and maxima in light transmission and intensity enhancement. The effect of aperture taper is also to dramatically increase light transmission and intra-aperture intensity, but with a red shift in the maxima and negligible shift in the minima. The use of conical apertures should improve the efficiency of nonlinear optical processes as well as applications of light harvesting, such as biomolecule detection.

Paper Details

Date Published: 1 February 2010
PDF: 11 pages
J. Nanophoton. 4(1) 043504 doi: 10.1117/1.3357301
Published in: Journal of Nanophotonics Volume 4, Issue 1
Show Author Affiliations
Mohit Diwekar, The Univ. of Utah (United States)
Steve Blair, The Univ. of Utah (United States)
Mark Davis, MOXTEK, Inc. (United States)

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