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A novel filter wheel for multi-channel switching and polarization rotation

Weng, Chun-Jen, Wang, Lijuan, Chen, Chih-Yen, Liu, Da-Ren, Hwang, Chi-Hung, Chang, Shian-Wen (2019) A novel filter wheel for multi-channel switching and polarization rotation. Optik, 200 . ISSN 0030-4026. (doi:10.1016/j.ijleo.2019.163122) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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This study proposes an innovative filter wheel for the multi-channel switching of polarization state. The proposed device enables switching between two orthogonal linear polarization states or two orthogonal circular polarization states to achieve either linear dichroism (LD) or circular dichroism (CD). The filter wheel enables channel switching and orientation rotation with high repeatability. This paper describes in detail the methods used in the alignment of multiple polarizers and quarter-waveplates. In addition, the extinction ratio and retardation, which can be used as indications of polarimetric performance, are measured to a high degree of precision. The apparatus was applied for 6-channel polarization state switching in which three channels were used for multi-spectral broadband polarimetric applications across a range of 400–1600 nm. The remaining three channels were used for multi-wavelength precision polarimetric applications at wavelengths of 457, 532, and 632 nm in the visible range. When installed in a microspectrophotometer, the proposed apparatus can be used in multi-spectral broadband polarimetric spectroscopy as well as multi-wavelength polarimetric imaging applications to achieve LD and CD effects at the micro scale.

Item Type: Article
DOI/Identification number: 10.1016/j.ijleo.2019.163122
Uncontrolled keywords: Filter wheel; Multi-channel; Linear dichroism; Circular dichroism; Polarimetric spectroscopy; Polarization state switching; Microspectrophotometry
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA165 Engineering instruments, meters etc. Industrial instrumentation
Divisions: Faculties > Sciences > School of Engineering and Digital Arts > Instrumentation, Control and Embedded Systems
Depositing User: Lijuan Wang
Date Deposited: 25 Oct 2019 15:48 UTC
Last Modified: 06 Feb 2020 04:20 UTC
Resource URI: (The current URI for this page, for reference purposes)
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