【摘 要】
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Using numerical calculation, we examine the effects of gap distance of a pair of nano gap silver prisms with rounded coers on the local light intensity enhancem
【机 构】
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Department of Optical Science and Engineering, Faculty and School of Engineering, The University of
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Using numerical calculation, we examine the effects of gap distance of a pair of nano gap silver prisms with rounded coers on the local light intensity enhancement. Two peaks due to localized surface plasmon (LSP) excitation are observed in a wavelength range from 900nm to 300nm. The results demonstrate that peaks at a longer and a shorter wavelength corresponded to dipole-like and quadrupole-like LSP resonances, respectively. It is found that a gap distance up to 20nm provides larger light intensity enhancement than that of a single silver nano prism with rounded coers. Furthermore, nano gap silver prisms are fabricated by direct focused ion beam processing, and we measure the scattering light spectrum of a pair of nano prisms by a confocal optical system.However, the two LSP peaks are not observed in visible range because the sizes of the nano gap and prisms are too large.
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