Research Papers

Increased light gathering capacity of sub-wavelength conical metallic apertures

[+] Author Affiliations
Mohit Diwekar, Steve Blair

University of Utah, Department of Electrical and Computer Engineering, 50 S Central Campus Drive, Salt Lake City, UT 84112

Mark Davis

MOXTEK Inc., Orem, UT 84057

J. Nanophoton. 4(1), 043504 (February 17, 2010). doi:10.1117/1.3357301
History: Received November 11, 2009; Revised February 11, 2010; Accepted February 12, 2010; February 17, 2010; Online February 17, 2010
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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.

© 2010 Society of Photo-Optical Instrumentation Engineers

Topics

Apertures

Citation

Mohit Diwekar ; Steve Blair and Mark Davis
"Increased light gathering capacity of sub-wavelength conical metallic apertures", J. Nanophoton. 4(1), 043504 (February 17, 2010). ; http://dx.doi.org/10.1117/1.3357301


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