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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 23 — Nov. 12, 2007
  • pp: 15457–15463

Color filter based on a subwavelength patterned metal grating

Hong-Shik Lee, Yeo-Taek Yoon, Sang-Shin Lee, Sang-Hoon Kim, and Ki-Dong Lee  »View Author Affiliations

Optics Express, Vol. 15, Issue 23, pp. 15457-15463 (2007)

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A color filter incorporating a subwavelength patterned grating in a metal film perforated with a square array of circular apertures on a quartz substrate was accomplished. Its performance was enhanced by applying a dielectric overlay to the grating layer so as to match the refractive indices of the media on either side of it. The device was designed by utilizing the finite-difference time-domain method and implemented by adopting the electron-beam direct-writing technique. Two different devices were fabricated with the structural parameters: the grating height of 50 nm and the pitch of 340 nm for the red color and 260 nm for the green color. For the red color filter the center wavelength was 680 nm and the peak transmission 57%, while for the green color one the center wavelength was 550 nm and the peak transmission 50%. It was confirmed the introduction of the index matching overlay led to an increase of ~15% in the transmission efficiency and helped combine double bands into a single dominant band as well, thereby improving the color selectivity of the filter.

© 2007 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(160.3900) Materials : Metals
(240.6680) Optics at surfaces : Surface plasmons
(050.6624) Diffraction and gratings : Subwavelength structures
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Diffraction and Gratings

Original Manuscript: October 4, 2007
Revised Manuscript: November 2, 2007
Manuscript Accepted: November 4, 2007
Published: November 6, 2007

Hong-Sik Lee, Yeo-Taek Yoon, Sang-shin Lee, Sang-Hoon Kim, and Ki-Dong Lee, "Color filter based on a subwavelength patterned metal grating," Opt. Express 15, 15457-15463 (2007)

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