Abstract

Subwavelength gratings consisting of three layers with periodic structures are investigated. Contrary to the conclusions of many previous works that the transmittance of transverse magnetic (TM) light is higher than that of transverse electric (TE) light over the entire visible range, the transmittance is flipped in the short-wavelength regime, due to localized surface plasmon enhanced absorption of TM light by silver nanowires, while the converse holds in the longer-wavelength region because of the plasmonic waveguiding and cutoff effect of the metal–insulator–metal slits, which enhance TM transmission and prohibit TE propagation, respectively. Thus chromatic polarizations are rendered. Due to their nonresonant character, the spectral responses of the gratings vary little in a wide incident angle range. This work reveals a novel mechanism for fabricating integrated color filters and polarizers conveniently, which has broad applications in LCDs and CMOS sensors.

© 2014 Optical Society of America

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