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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 2 — Jan. 18, 2010
  • pp: 1695–1703

Achromatic phase retarder applied to 
MWIR & LWIR dual-band

Guoguo Kang, Qiaofeng Tan, Xiaoling Wang, and Guofan Jin  »View Author Affiliations

Optics Express, Vol. 18, Issue 2, pp. 1695-1703 (2010)

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The development of the dual-band IR imaging polarimetry creates the need for achromatic phase retarder used in dual-band. Dielectric grating with the period smaller than the illuminating wavelength presents a strong form-birefringence. With this feature, the combination of several subwavelength gratings can be used as achromatic phase retarders. We proposed a combination of 4 subwavelength structured gratings (SWGs) used as an achromatic quarter-wave plate (QWP) applied to MWIR & LWIR bandwidths. Design method using effective medium theory and optimization algorithms is described in detail. The simulation results led to the possibility of an dual-band achromatic QWP whose retardance deviates from 90° by <±0.75° with the fast axis unfixed and by <±1.35° with the fast axis fixed over MWIR(3-5μm) & LWIR(8-12μm) bandwiths.

© 2010 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.2555) Diffraction and gratings : Form birefringence
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Diffraction and Gratings

Original Manuscript: December 7, 2009
Revised Manuscript: January 7, 2010
Manuscript Accepted: January 8, 2010
Published: January 14, 2010

Guoguo Kang, Qiaofeng Tan, Xiaoling Wang, and Guofan Jin, "Achromatic phase retarder applied to 
MWIR & LWIR dual-band," Opt. Express 18, 1695-1703 (2010)

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