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Optical Engineering • Open Access

Improving coupling efficiency of tapered metallic gaps using spatial amplitude modulation
Author(s): Yongzhu Chen; Xiangsheng Xie; Gengyan Chen; Lina Guo; Xusheng Lin

Paper Abstract

Improving the coupling efficiency of tapered metallic gaps using spatial amplitude modulation is theoretically investigated. The influences of the critical parameters on the coupling efficiency, such as incident beam width, incident wavelength, and numerical aperture of coupling lens, are analyzed, respectively, and a coupling efficiency increase of about 16.43-fold is obtained by optimizing these parameters. The physical mechanism of the coupling efficiency improvement is further discussed. The substantial improvement of the coupling efficiency via spatial amplitude modulation shows the potential in designing tapered metal-insulator-metal waveguides for field enhancement and nanofocusing.

Paper Details

Date Published: 3 February 2015
PDF: 4 pages
Opt. Eng. 54(2) 025102 doi: 10.1117/1.OE.54.2.025102
Published in: Optical Engineering Volume 54, Issue 2
Show Author Affiliations
Yongzhu Chen, Guangdong Polytechnic Normal Univ. (China)
Fudan Univ. (China)
Xiangsheng Xie, Sun Yat-Sen Univ. (China)
Gengyan Chen, Guangdong Polytechnic Normal Univ. (China)
Lina Guo, Guangdong Polytechnic Normal Univ. (China)
Xusheng Lin, Guangdong Polytechnic Normal Univ. (China)


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