Achromatic phase retarder applied to MWIR & LWIR dual-band

Guoguo Kang; Qiaofeng Tan; Xiaoling Wang; Guofan Jin

doi:10.1364/OE.18.001695

Achromatic phase retarder applied to MWIR & LWIR dual-band

Guoguo Kang^*, Qiaofeng Tan, Xiaoling Wang, Guofan Jin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

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(3-5μ) & LWIR(8-12μ) bandwiths.

Original language	English
Pages (from-to)	1695-1703
Number of pages	9
Journal	Optics Express
Volume	18
Issue number	2
DOIs	https://doi.org/10.1364/OE.18.001695
Publication status	Published - 18 Jan 2010
Externally published	Yes

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abstract = "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(3-5μ) & LWIR(8-12μ) bandwiths.",

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AU - Kang, Guoguo

AU - Tan, Qiaofeng

AU - Wang, Xiaoling

AU - Jin, Guofan

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AB - 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(3-5μ) & LWIR(8-12μ) bandwiths.

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Achromatic phase retarder applied to MWIR & LWIR dual-band

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