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Ultrasmall radial polarizer array based on patterned plasmonic nanoslits
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Image of FIG. 1.
FIG. 1.

(a) Schematic drawing of the RPC based on a plasmonic gold nanoslit pattern. It consists of four quadrants, each having 180° retardation. The RPC is arranged by changing the slit orientation in steps of 45°. As the nanoslit array has its principal axis (fast axis) along a slit, a 45° linear-polarized light can be converted to a radially polarized light. (b) Schematic of a cross section of each slit array allocated on each quadrant.

Image of FIG. 2.
FIG. 2.

(a) Contour plots of phase shifts (solid curves) and the ratio of amplitude transmittance (, dashed curves) for the 633 nm incident wavelength. The pitch of the slit array was fixed to 500 nm. (b) Regions to achieve both ° phase shift and amplitude ratio for each incident wavelength. (c) Amplitude transmittance spectrum of above-mentioned regions.

Image of FIG. 3.
FIG. 3.

(a) An SEM image of a fabricated RPC array. The size of an RPC unit is . (b) Experimental setup for the retardation measurement based on the Sénarmont method. (c) Retardation spectra on 525-nm-period and 300-nm-wide gold nanoslit by Sénarmont method measurement (circle), FDTD calculation (square), and theoretical estimation (solid line), respectively. Error bars indicate standard deviations over four quadrants (n = 50 for each quadrant).

Image of FIG. 4.
FIG. 4.

Normalized intensity of transmitted light through each quadrant of RPC and fitting with component of Stokes vector.

Image of FIG. 5.
FIG. 5.

Polarization microscope images of the 300-nm-wide slit RPC illuminated by white light with and without a 633 nm bandpath filter. Dashed lines at RPC symbol indicate fast axes of quadrants (slit direction). Symbols indicate the number of each quadrant.


Generic image for table
Table I.

Retardation (deg) for 633-nm irradiation of each nanoslit array quadrant with slit widths of 350 and 300 nm. The period and thickness of both slit arrays are 525 and 445 nm, respectively.


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Scitation: Ultrasmall radial polarizer array based on patterned plasmonic nanoslits