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Proceedings Paper

U-shaped nano-apertures for enhanced optical transmission and resolution
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Paper Abstract

The subject of light transmission through optically thin metal films perforated with arrays of subwavelength nanoholes has recently attracted significant attention. In this work, we present experimental and calculated results on optical transmission/reflection of the U-shaped nanoapertures for enhanced optical transmission and resolution. We propose different structure designs in order to prove the effect of geometry on resonance and enhanced fields. Theoretical calculations of transmission/reflection spectra and field distributions of U-shaped nano-apertures are performed by using 3-dimensional finite-difference time-domain method. The results of these numerical calculations show that transmission through the apertures is indeed concentrated in the gap region. Added to theoretical calculations we also performed a liftoff free plasmonic device fabrication technique based on positive resist electron beam lithography and reactive ion etching in order to fabricate U-shaped nanostructures. After transferring nanopattern on 80 nm thick suspended SiNx membrane using EBL followed by dry etching, a directional metal deposition processes is used to deposit 5 nm thick Ti and 30 nm thick Au layers. Theoretical calculations are supported with experimental results to prove the tunability of resonances with the geometry at the mid-infrared wavelengths which could be used for infrared detection of biomolecules.

Paper Details

Date Published: 14 May 2011
PDF: 6 pages
Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340H (14 May 2011); doi: 10.1117/12.884355
Show Author Affiliations
Mustafa Turkmen, Erciyes Univ. (Turkey)
Boston Univ. (United States)
Serap Aksu, Boston Univ. (United States)
A. Engin Çetin, Boston Univ. (United States)
Ahmet A. Yanik, Boston Univ. (United States)
Alp Artar, Boston Univ. (United States)
Hatice Altug, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 8034:
Photonic Microdevices/Microstructures for Sensing III
Hai Xiao; Xudong Fan; Anbo Wang, Editor(s)

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