Surface shape resonances in lamellar metallic gratings

Abstract

The specular reflectivity of lamellar gratings of gold with grooves 0.5 microns wide separated by a distance of 3.5 microns was measured on the 2000 cm${}^{-1}$ - 7000 cm${}^{-1}$ spectral range for p-polarized light. For the first time, experimental evidence of the excitation of electromagnetic surface shape resonances for optical frequencies is given. In these resonances the electric field is highly localized inside the grooves and is almost zero in all other regions. For grooves of depth equal to 0.6 microns, we have analyzed one of these modes whose wavelength (3.3 microns) is much greater than the lateral dimension of the grooves.

4 pages (LaTex), 5 postscript figures, to be published in Physical Review Letters

Cited by in corpus (11)

• Transmission resonances on metallic gratings with very narrow slits
• Strong Discontinuities in the Complex Photonic Band Structure of Transmission Metallic Gratings
• Efficient excitation of cavity resonances of subwavelength metallic gratings
• Light scattering from disordered overlayers of metallic nanoparticles
• Light reflection from a metal surface with subwavelength cavities
• Two new type surface polaritons excited into nanoholes in metal films
• Investigation of the spectra of coupled polaritons on the periodically modulated metallic layer and the narrow regions of anomalous transparency
• Resonant amplified seismic response within a hill or mountain
• Ultrafast laser-induced subwavelength structures towards nanoscale: the significant role of plasmonic effects
• Asymmetrically filled slits in a metal film that split a light beam into two depending on its wavelength
• New resonance-polariton Bose-quasiparticles enhances optical transmission into nanoholes in metal films