Journal
OPTICS EXPRESS
Volume 15, Issue 15, Pages 9575-9583Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.009575
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We 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. (c) 2007 Optical Society of America.
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