Optical extinction spectra of gold particle arrays (sample A) with different grating constants . has been fixed to 220 nm. The spectra were recorded under normal incidence with a polarization along the axis. The critical grating constant in the substrate is . Spectra are vertically shifted for clarity.
Particle plasmon wavelength vs for - (∎) and -polarizations (●). The inset shows SEM image of a grating with and . The dashed lines serve as guides to the eye.
(Left) SEM image of a gold nanorod array . (Right) Optical extinction spectra of gold nanorod arrays (sample B) with different grating constants . The spectra were recorded under normal incidence with a polarization along the axis. The critical grating constant is in the substrate and in air.
Plot of particle plasmon resonance wavelength (●) and grating-induced mode (∎) vs the grating constant . The solid straight line —represents the condition , where .
Optical extinction spectra for oblique incidence angles of a gold nanorod array (sample B) with . For the recorded spectra, the sample was rotated about the -axis (the particles long axis) and the light polarized parallel to (in the plane of incidence). The critical grating constant is in the substrate and in air.
Particle plasmon resonance wavelength (●) and grating-induced mode (∎) vs the incidence angle. The solid line — represents the condition where .
Extinction spectrum of particle array (sample A) recorded in carbon tetrachloride under - (spectrum A) and -polarizations (spectrum B). The critical constant is in ITO and in carbon tetrachloride. In spectrum A (-polarization), no grating mode occurs according to . Two additional bands emerge in spectrum B (-polarization) at 794 and 837 nm corresponding to grating modes in and ITO, respectively.
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