Effect of surface plasmon resonance on the optical activity of chiral metal nanogratings
2007; Optica Publishing Group; Volume: 15; Issue: 15 Linguagem: Inglês
10.1364/oe.15.009575
ISSN1094-4087
AutoresKuniaki Konishi, T. Sugimoto, Benfeng Bai, Yuri Svirko, Makoto Kuwata‐Gonokami,
Tópico(s)Optical Coatings and Gratings
ResumoWe examine the mechanism responsible for the optical activity of a two-dimensional array of gold nanostructures with no mirror symmetry on a dielectric substrate. Measurements with different incident angles, polarizations and sample orientations allow us to reveal that observed polarization effect is enhanced by surface plasmon resonance. By performing numerical simulation with rigorous diffraction theory we also show that the grating chirality can be described in terms of the non-coplanarity of the electric field vectors at the front (air-metal) and back (substrate-metal) sides of the grating layer.
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