An achromatic linear polarization rotator based on a tandem-2?-twisted nematic liquid crystal cell (tandem-2?-TNLC cell, where 2? represents the total twisted angle) is theoretically analyzed and experimentally demonstrated. The tandem-2?-TNLC cell comprises two conventional ?-TNLC cells with the required arrangement that the LC director close to the last layer of the first ?-TNLC cell should be perpendicular to that close to the first layer of the second ?-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-2?-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.
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