Abstract

A nanometeric plasmonic nanonotch structure with a dielectric core is proposed and demonstrated numerically by using the finite difference time-domain (FDTD) method. An analytic model based on resonance theory is given. The result reveals that the nanonotch structure can realize a narrow-band wavelength-filtering function. The wavelengths of dips are proportional to the length of the nanonotch and are inverse proportional-like to its width. The effect of the rounded corners at the crossing section on the transmission characteristics is also explored. The plasmonic nanonotch structure has an ultracompact size in the length of a few hundred nanometers. Our results may open a way to construct nanoscale high-density photonic integration circuits and biochemical sensors.

© 2010 Optical Society of America

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