Enhanced subwavelength light spot of vertically tapered metallic aperture based on plasmonics

Jun-Bum Park; KyuHo Kim; Il-Min Lee; Dawoon Choi; Byoungho Lee

doi:10.1117/12.999895

26 November 2012 Enhanced subwavelength light spot of vertically tapered metallic aperture based on plasmonics

Jun-Bum Park, KyuHo Kim, Il-Min Lee, Dawoon Choi, Byoungho Lee

Proceedings Volume 8556, Holography, Diffractive Optics, and Applications V; 85560E (2012) https://doi.org/10.1117/12.999895
Event: Photonics Asia, 2012, Beijing, China

Abstract

We propose an approach that improves the characteristics of a subwavelength light spot from a tapered aperture without increment of the subwavelength spot size, via simply introducing a taper along the aperture shape. Two advantageous features of the proposed tapered structure are investigated: At first, by enlarging the entrance area of the aperture, it could collect more light with respect to the regular one. Thus the funneled light contributes to the field enhancement. Furthermore, the tapered edges of the exit surface of the aperture provide confined field, a wedge mode, which is bounded strongly and enhances the local electric field around the edge of the aperture. The enhanced characteristics of subwavelength spot in vertically-tapered aperture, including peak intensity, power throughput, and full width half maximum were obtained numerically using finite difference time domain method. The proposed device is fabricated using conventional planar fabrication techniques and focused ion beam milling to realize the tapered structure. The relative tapered angle-dependent enhancements are presented with experimental and quantitative demonstrations of the proposed structure.

Citation Download Citation

Jun-Bum Park, KyuHo Kim, Il-Min Lee, Dawoon Choi, and Byoungho Lee "Enhanced subwavelength light spot of vertically tapered metallic aperture based on plasmonics", Proc. SPIE 8556, Holography, Diffractive Optics, and Applications V, 85560E (26 November 2012); https://doi.org/10.1117/12.999895

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