High Efficiency Large-Angle Pancharatnam Phase Deflector Based on Dual Twist Design
MIT Lincoln Laboratory Lexington United States
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Pancharatnam made clear the concept of a phase-only device based on changes in the polarization state of light1. It was later shown that this concept could be used to make an optical device that could simulate a prism. We have previously shown through simulation that an optical beam deflector based on Pancharatnam phase can provide high efficiency with up to 80 deflection using a dual-twist structure for polarization state control2,3. In this report, we demonstrate that its optical performance is as predicted and far beyond what could be expected for a conventional diffractive optical device. We provide details about construction and characterization of a 40 beam steering device with 90 diffraction efficiency based on our dual-twist design at 633nm wavelength.