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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 3 — Feb. 10, 2014
  • pp: 3691–3704

Enhancement of color saturation and color gamut enabled by a dual-band color filter exhibiting an adjustable spectral response

Vivek Raj Shrestha, Chul-Soon Park, and Sang-Shin Lee  »View Author Affiliations

Optics Express, Vol. 22, Issue 3, pp. 3691-3704 (2014)

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The enhancement of color saturation and color gamut has been demonstrated, by taking advantage of a dual-band color filter based on a subwavelength rectangular metal-dielectric resonant grating, which exhibits an adjustable spectral response with respect to its relative transmittances at the two bands of green and red, thereby producing any color in between green and red, through the adjustment of incoming light polarization. Also, the prominent features of the spectral response of the filter, namely the bandwidth and resonant wavelength, can be readily adjusted by varying the dielectric layer thickness and the grating pitch, respectively. The dependence of chromaticity coordinates of the filter in the CIE (International Commission on Illumination) 1931 chromaticity diagram upon the parameters of the spectral response, including the center wavelength, spectral bandwidth and sideband level, has been rigorously examined, and their influence on the color gamut and the excitation purity, which is a colorimetric measure of saturation, has been analytically explored at the same time, in order to optimize the color performance of the filters. In particular, a device with wider spectral bandwidth was observed to efficiently extend the color gamut and enhance the color saturation, i.e. the excitation purity for a given sideband level. Two dual-band green-red filters, exhibiting different bandwidths of about 17 and 36 nm, were specifically designed and fabricated. As compared with the case with narrower bandwidth, the device with wider bandwidth was observed to provide both higher excitation purity leading to better color saturation and greater separation of the chromaticity coordinates for the filter output for different incident polarizations, which provides extended color gamut. The proposed device structure may permit the color tuning span to encompass all primary color bands, by adjusting the grating pitch.

© 2014 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(230.7400) Optical devices : Waveguides, slab
(330.1730) Vision, color, and visual optics : Colorimetry
(310.6628) Thin films : Subwavelength structures, nanostructures
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: November 29, 2013
Revised Manuscript: January 28, 2014
Manuscript Accepted: January 29, 2014
Published: February 7, 2014

Virtual Issues
Vol. 9, Iss. 4 Virtual Journal for Biomedical Optics

Vivek Raj Shrestha, Chul-Soon Park, and Sang-Shin Lee, "Enhancement of color saturation and color gamut enabled by a dual-band color filter exhibiting an adjustable spectral response," Opt. Express 22, 3691-3704 (2014)

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