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Proceedings Article

Phase shift of plasmons excited by slits in a metal film illuminated by oblique incident TM plane wave

[+] Author Affiliations
Guangyuan Li, Anshi Xu

Peking Univ. (China)

Proc. SPIE 7135, Optoelectronic Materials and Devices III, 71350T (November 18, 2008); doi:10.1117/12.803469
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From Conference Volume 7135

  • Optoelectronic Materials and Devices III
  • Yi Luo; Jens Buus; Fumio Koyama; Yu-Hwa Lo
  • Hangzhou, China | October 26, 2008

abstract

The interactions between the optical light and sub-wavelength structures in metal film have sparked great interest on surface plasmon polaritons (SPPs). One effective way to interpret these phenomena is to make use of the phase shift between the SPP excited and the incident wave. Many theoretical and experimental studies have shown that this shift approximate to π is intrinsic at normal incidence. In this paper, the phase shift at oblique incidence is analyzed and used to interpret the transmission effect for the first time to our knowledge. A simplified 2D scattering formulation using vector finite element method is set up. Simulations show the phase shift can be approximate to π over a large range of incidence angles. With this shift, the conditions for the enhanced or suppressed transmission and the corresponding destructive or constructive interference of SPPs at oblique incidence are achieved. The transmission effect for incidence angle not satisfying these conditions, as well as its potential applications is also discussed.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Guangyuan Li and Anshi Xu
"Phase shift of plasmons excited by slits in a metal film illuminated by oblique incident TM plane wave", Proc. SPIE 7135, Optoelectronic Materials and Devices III, 71350T (November 18, 2008); doi:10.1117/12.803469; http://dx.doi.org/10.1117/12.803469


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