Abstract

We theoretically discuss all-optical switching at the Fano resonances of subwavelength gratings made of a chalcogenide glass (As2S3). Particular attention is devoted to the case in which the grating possesses extremely narrow slits (channels ranging from a10nm to a40nm). The remarkable local field enhancement available in these situations conspires to yield low-threshold switching intensities (~50MW/cm2) at telecommunication wavelengths for extremely thin (d200nm) gratings when a realistic value of the As2S3 cubic nonlinearity is used.

© 2011 Optical Society of America

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