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23 August 2010 Single dielectric columnar thin film as a broadband polarization conversion device
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In this work, a simple and high efficient way to change the polarization state is proposed. A broadband polarization conversion (PC) filter based on a prism coupling system (BK7 prism/anisotropic film/air) is investigated. The anisotropic SiO2 thin film prepared by glancing angle deposition is a columnar thin film with near uniaxial property. At a certain angle range around 51.5. over the critical angle, there exists an enhanced PC reflection when the plane of incidence is vertical to the deposition plane. The reason of polarization conversion (PC) reflectance in an anisotropic SiO2 thin film (n1', n2', n3') = (1.260, 1.216, 1.215) is analyzed and interpreted in the prism-coupling system (prism/ SiO2 thin film /air). In order to achieve the broadband PC reflectance spectrum, a three-layered structure (isotropic MgF2 thin film/ anisotropic SiO2 thin film/ isotropic MgF2 thin film) was arranged. The three-layered structure thin film is investigated optimum ability as broadband polarization device.
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Yi-Jun Jen, Meng-Jie Lin, and Wen-Pao Tsai "Single dielectric columnar thin film as a broadband polarization conversion device", Proc. SPIE 7766, Nanostructured Thin Films III, 776608 (23 August 2010);


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