All-optical switching at the Fano resonances in subwavelength gratings with very narrow slits |
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Authors: | D'Aguanno G de Ceglia D Mattiucci N Bloemer M J |
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Institution: | Nanogenesis Division, AEgis Technologies, 410 Jan Davis Drive, Huntsville, Alabama 35806, USA. giuseppe.daguanno@us.army.mil |
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Abstract: | We theoretically discuss all-optical switching at the Fano resonances of subwavelength gratings made of a chalcogenide glass (As(2)S(3)). Particular attention is devoted to the case in which the grating possesses extremely narrow slits (channels ranging from a~10 nm to a~40 nm). The remarkable local field enhancement available in these situations conspires to yield low-threshold switching intensities (~50 MW/cm(2)) at telecommunication wavelengths for extremely thin (d~200 nm) gratings when a realistic value of the As(2)S(3) cubic nonlinearity is used. |
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