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Reflective liquid crystal hybrid beam-steerer.

Oliver Willekens, Xiaoning Jia, Michael Vervaeke

    Optics Express
    |September 24, 2016
    PubMed
    Summary

    This study demonstrates efficient optical beam-steering using a liquid crystal and reflective grating. The device achieves significant beam deflection at low voltages, enabling tunable reflection and total internal reflection.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Liquid crystal technology

    Background:

    • Optical beam-steering is crucial for various applications, including optical communication and sensing.
    • Traditional beam-steering methods often involve bulky or complex mechanical components.
    • Developing compact and electronically controllable beam-steering devices is an active area of research.

    Purpose of the Study:

    • To investigate the performance of a novel optical beam-steering device.
    • To demonstrate efficient beam deflection using a hot-embossed reflective blazed grating and liquid crystal.
    • To explore the tunable reflection and total internal reflection capabilities of the device.

    Main Methods:

    • Numerical simulation of liquid crystal electrical switching characteristics.

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  • Finite-difference time-domain (FDTD) optical simulation for beam deflection analysis.
  • Experimental fabrication and characterization of the reflective blazed grating and liquid crystal device.

    • Main Results:

    • Achieved beam deflection angles of 4.4° at perpendicular incidence with low applied voltages (3.4 V).
    • Experimental results showed good agreement with numerical and optical simulations.
    • Demonstrated electronic switching between tunable angle reflection and total internal reflection by tilting the device.

    Conclusions:

    • The developed device offers an efficient and electronically controllable method for optical beam-steering.
    • The combination of a hot-embossed grating and liquid crystal provides a promising platform for compact optical systems.
    • The tunable reflection and total internal reflection capabilities expand the potential applications of this technology.