| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Optimal Design of an Achromatic Angle-Insensitive Phase Retarder Used in MWIR Imaging Polarimetry |
| KANG Guo-Guo, TAN Qiao-Feng, JIN Guo-Fan |
| State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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KANG Guo-Guo, TAN Qiao-Feng, JIN Guo-Fan 2009 Chin. Phys. Lett. 26 074218 |
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Abstract Dielectric gratings with period in the range from λ/10 to λ/4 with λ being the illumination wavelength not only exclude higher order diffractions but also exhibit strong dispersion of effective indices which are proportional to the wavelength. Moreover, they are insensitive to the incident angle of the illumination wave. With these features, we can design a true zero-order achromatic and angle-insensitive phase retarder which can be used as the polarization state analyzer in middle wave infrared (MWIR) imaging polarimetry. A design method using effective medium theory is described, and the performance of the designed phase retarder is evaluated by rigorous coupled wave analysis theory. The calculation results demonstrate that the retardance deviates from 45° by<±1.6° within a field of view ±pm 10° over the MWIR bandwidth (3-5μm).
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| Keywords:
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Received: 18 February 2009
Published: 02 July 2009
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