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Opt Lett. 2011 Jul 1;36(13):2498-500. doi: 10.1364/OL.36.002498.

Plasmonic wave plate based on subwavelength nanoslits.

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  • 1School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, USA.


We propose a quarter-wave plate based on nanoslits and analyze it using a semianalytical theory and simulations. The device comprises two nanoslits arranged perpendicular to one another where the phases of the fields transmitted by the nanoslits differ by λ/4. In this way, the polarization state of the incident light can be changed from linear to circular or vice versa. The plasmonic nanoslit wave plate is thin and has a subwavelength lateral extent. We show that the predictions for the phase shift obtained from a semianalytical model are in very good agreement with simulations by the finite difference time domain method.

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