Abstract
An achromatic linear polarization rotator based on a tandem-2ϕ-twisted nematic liquid crystal cell (tandem-2ϕ-TNLC cell, where 2ϕ represents the total twisted angle) is theoretically analyzed and experimentally demonstrated. The tandem-2ϕ-TNLC cell comprises two conventional ϕ-TNLC cells with the required arrangement that the LC director close to the last layer of the first ϕ-TNLC cell should be perpendicular to that close to the first layer of the second ϕ-TNLC cell. With such a simple combination, the TNLC performances are considerably improved. According to the experimental results and theoretical analyses by Jones Calculus, the tandem-2ϕ-TNLC polarization rotator with suitable parameters is achromatic and insensitive to the polarization plane of incident light. Such properties provide these polarization rotators with potential for practical applications.
Highlights
Controlling the polarization state of light by polarization rotation techniques is important in intensity/
With regard to liquid crystal (LC) polarization rotators, twisted nematic LCs (TNLCs) have been extensively applied in many fields of optics and photonics; these rotators are characterized by their electrical switchability and polarization rotation of linearly polarized (LP) lights that is based on the waveguide effect[2,3,5,8,9,10,11]
The effect of the β angle in the tandem-2φ-TNLC cell on the minimum transmittance of the output beam passing through a linear polarizer, polarization state, and polarization rotation angle of the output beam according to tandem-2φ-TNLC polarization rotator theory are discussed
Summary
Controlling the polarization state of light by polarization rotation techniques is important in intensity/. Devices for controlling the polarization orientation of linearly polarized (LP) lights, including prism rotators (Fresnel rhombs and broadband prismatic rotator), Faraday rotators, and birefringent rotators (half- and quarter-wave retardation plates), have been developed[6]. Among these techniques, the simplest approach to designing a polarization rotator for an LP light that is based on crystal optics is the half-wave retardation plate (λ/2 plate), which can ideally rotate the polarization direction of an LP light with a single wavelength to any other direction[5,6,7]. (m is an integer.)] to obtain the property of β angle-independence cannot eliminate the wavelength limitation unless the www.nature.com/scientificreports/
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