Infrared polarizing beam-splitters for the 7 to 13 μm spectral region

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Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
ConferenceAdvances in Optical Thin Films IV, 5 September 2011 through 7 September 2011, Marseille
Article number1
SubjectFrustrated total internal reflections; FTIR; Infrared coatings; Optical contacting; Polarization imaging; Polarizer; Polarizing beam splitters; Coatings; Germanium; Light reflection; Light transmission; Optical constants; Optical instruments; Polarization; Refractive index; Thin films; Optical films
AbstractHigh performance infrared polarizing beam-splitters (PBS) with broad bands and wide angular fields are required for IR applications that use both transmitted and reflected polarizing beams equally from 3 to 14 ?m. Existing infrared wire grid polarizers do not meet the requirements because they have good performance only in transmission, not in reflection. No practical IR PBS devices are yet available for this spectral region. In this paper, we propose to fabricate an infrared thin film polarizing beam-splitters based on previously described light interference and frustrated total internal reflection. The PBS coatings consist of Ge and fluorite layers on ZnSe prism substrates. Similar high performance PBS designs have been successfully made in the visible. However, it is more challenging to make such PBSs in the infrared region, mostly due to the use of soft IR coating materials, the low energy evaporation process and the optical contacting bonding technique. In the paper, we will report for the first time the measured performance of a prototype IR PBS for the 7-13 μm spectral region with an angular field ±7.82° in air. We will also discuss the challenges in fabricating the prototype PBS, including optical constant characterization and device measurements. © 2011 SPIE.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21271553
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Record identifier93493c7e-9f3b-48af-bb55-866271d3edcc
Record created2014-03-24
Record modified2017-04-24
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