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Metal wire-grid whose period is far less than the illuminating wavelength exhibits strong polarization selectivity within a large field of view over a wide wave length range. Thus it could be used as the polarization-controller in the polarimetric imaging system. For infrared polarimetric imaging system, an aluminum wire-grid on the CaF substrate with period of 200nm and depth of 100nm was designed based on effective medium theory. The calculation results demonstrate that the designed wire-grid has the extinction ratio larger than 35 dB within a field of view ±20° over both middle wave infrared (MWIR) (3—5 μm) and long wave infrared (LWIR) (8—12 μm). The aluminum wire-grid was fabricated by electron beam lithography, reactive ion etching and plasma stripping. A clear-cut polarimetric image was obtained when wire-grid was placed in front of a MWIR thermal infrared imager.
[1] Tyo J S, Goldstein D L, Chenault D B, Shaw J A 2006 Appl. Opt. 45 5453
[2] Shen S, She J, Tao T 2005 J. Opt. Soc. Am. A 22 961
[3] Yamada I, Nishii J, Satio M 2008 Opt. Lett. 47 4735
[4] Richter I, Sun P C, Fainman Y 1995 Appl. Opt. 34 2421
[5] Zhang S W, Bayanheshig 2008 Acta. Phys. Sin. 57 3486 (in Chinese) [张善文、巴音贺希格 2008 57 3486]
[6] Zhao D Z, Zhang H Y 1988 Wave Optics(Beijing:Astronautic Publishing House) p63 (in Chinese) [赵达尊、张怀玉 1988 波动光学(北京:宇航出版社)第63页]
[7] Ekberg M, Nikolajeff F, Larsson M, Hard S 1994 Appl. Opt. 33 103
[8] Zhu X L, Xu Y G, Yang S 2007 Opt Express. 15 16546
[9] Fang L, Du J L, Guo X W, Wang J Q, Zhang Z Y, Luo X G, Du C L 2008 Chin. Phys. B 17 2499
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[1] Tyo J S, Goldstein D L, Chenault D B, Shaw J A 2006 Appl. Opt. 45 5453
[2] Shen S, She J, Tao T 2005 J. Opt. Soc. Am. A 22 961
[3] Yamada I, Nishii J, Satio M 2008 Opt. Lett. 47 4735
[4] Richter I, Sun P C, Fainman Y 1995 Appl. Opt. 34 2421
[5] Zhang S W, Bayanheshig 2008 Acta. Phys. Sin. 57 3486 (in Chinese) [张善文、巴音贺希格 2008 57 3486]
[6] Zhao D Z, Zhang H Y 1988 Wave Optics(Beijing:Astronautic Publishing House) p63 (in Chinese) [赵达尊、张怀玉 1988 波动光学(北京:宇航出版社)第63页]
[7] Ekberg M, Nikolajeff F, Larsson M, Hard S 1994 Appl. Opt. 33 103
[8] Zhu X L, Xu Y G, Yang S 2007 Opt Express. 15 16546
[9] Fang L, Du J L, Guo X W, Wang J Q, Zhang Z Y, Luo X G, Du C L 2008 Chin. Phys. B 17 2499
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