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High-efficiency aerial display using a liquid crystal polarization grating, a retroreflector array, and a right-angle
Applied Optics
|May 14, 2020
Summary
A novel aerial display system uses an orthogonal circular polarization grating (OCPG) to achieve 100% optical throughput. This innovative design avoids total internal reflection, enhancing display efficiency for polarization-diffractive elements.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Traditional aerial display systems face limitations in optical throughput.
- Polarization-diffractive elements offer advanced optical functionalities.
Purpose of the Study:
- To develop an aerial display scheme with maximized optical throughput.
- To demonstrate a system compatible with Pancharatnam-Berry phase elements.
Main Methods:
- Fabrication of an orthogonal circular polarization grating (OCPG) and waveplate using polymer liquid crystal and photoalignment.
- Integration of OCPG, waveplate, retroreflector array (RRA), and right-angle prism (RAP).
- Experimental validation of the proposed optical path design.
Main Results:
- The OCPG enabled retroreflected light transmission through the RAP boundary, bypassing total reflection.
- The system design allows for potential 100% optical throughput by utilizing Brewster's angle.
- Experimental feasibility was confirmed through fabricated components.
Conclusions:
- The developed aerial display scheme significantly enhances optical efficiency.
- This technology is compatible with advanced polarization-diffractive elements.
- The system holds promise for next-generation aerial display applications.
