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Tunable wavelength-division multiplexing based on metallic nanoparticle arrays

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Abstract

We report a tunable wavelength-division multiplexing (WDM) structure based on two-dimensional silver nanoparticle arrays. The linewidth of the multiple geometric resonances of the arrays is of the order of several nanometers generally, which guarantees high wavelength selectivity. Optical channels can be selectively activated by setting the polarization of the incident wave. The operation wavelength can be tuned from the visible to the near infrared, and the free spectral range can be adjusted from hundreds to tens of nanometers by varying the size of the constituent particles and the interparticle distances. The proposed structure can provide an extinction ratio of 10 and a quality factor of 700. This tunable, easy-to-produce, and subwavelength WDM structure is desirable for plasmonic integrated circuits.

© 2010 Optical Society of America

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