Abstract

A type of surface-plasmon-polariton bandgap structure for generating a confined nanometric optical field with high intensity and very small sidelobes is simulated by using the finite-difference time-domain method. The numerical results show that the intensity enhancement of the confined field can reach 2 orders of magnitude, with a resolution (FWHM of the zero-order mode) of $0.33\lambda$ and the high-order modes (sidelobes) being effectively suppressed to no more than 15%. These properties ensure the confined field to be used as a near-field source. Detailed and systematic investigations of the enhancement and the localization versus the structure parameters are performed, and the physical mechanisms behind these phenomena are explained. Potential applications of the confined field in near-field detection and imaging are discussed through interactions with different types of nanospheres. The simulated results reveal that details with feature sizes down to $0.13\lambda$ can be resolved.

© 2008 Optical Society of America

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