Resonant backward scattering of light by a two-side-open subwavelength metallic slit

Details Resonant backward scattering of light by a two-side-open subwavelength metallic slit Resonant backward scattering of light by a two-side-open subwavelength metallic slit

2005-05-31

arxiv.org/abs/physics/0505211v2

Physics

Optics

5 figures

Scientific paper

The backward scattering of TM-polarized light by a two-side-open subwavelength slit in a metal film is analyzed. We show that the reflection coefficient versus wavelength possesses a Fabry-Perot-like dependence that is similar to the anomalous behavior of transmission reported in the study [Y. Takakura, Phys. Rev. Lett. \textbf{86}, 5601 (2001)]. The open slit totally reflects the light at the near-to-resonance wavelengths. In addition, we show that the interference of incident and resonantly backward-scattered light produces in the near-field diffraction zone a spatially localized wave whose intensity is 10-10$^3$ times greater than the incident wave, but one order of magnitude smaller than the intra-cavity intensity. The amplitude and phase of the resonant wave at the slit entrance and exit are different from that of a Fabry-Perot cavity.

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