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Proceedings Paper

Near perfect light trapping in 2D metal nanotrench gratings and its application for sensing (Conference Presentation)
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Paper Abstract

In this work, a 2D metallic nano-trench array was fabricated on gold metal surface by using an e-beam lithography patterning and etching process. Optical reflectance from the device was measured at oblique angles of incidence for TE and TM polarization. Near perfect light trapping was observed at different wavelengths for TE and TM polarization at oblique angle of incidence. As angle of incidence increases, light trapping wavelength has a red-shift for TM polarization and blue shift for TE polarization. The fabricated nano-trench device was also investigated for chemical sensor application. It was found that by varying the angle of incidence, the sensitivity changes with opposite trends for TE and TM polarization. Sensor sensitivity increases for TM polarization and decreases for TE polarization with increase of the oblique incident angle.

Paper Details

Date Published: 9 November 2016
PDF: 1 pages
Proc. SPIE 9921, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV, 992115 (9 November 2016); doi: 10.1117/12.2238186
Show Author Affiliations
Junpeng Guo, The Univ. of Alabama in Huntsville (United States)
Hong Guo, The Univ. of Alabama in Huntsville (United States)
Zhitong Li, The Univ. of Alabama in Huntsville (United States)


Published in SPIE Proceedings Vol. 9921:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV
Satoshi Kawata; Din Ping Tsai, Editor(s)

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