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Tunable reflective liquid crystal terahertz waveplates

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Abstract

Tunable liquid crystal devices that can change terahertz (THz) wave polarization continuously have many potential applications in THz optical systems [1]. We present a reflective liquid crystal THz waveplate with sub-wavelength metal grating and metal ground plane electrodes [2]. The thickness of the liquid crystal layer can be reduced to ~10% of that needed for the same phase shift at a given frequency in a transmissive waveplate. We experimentally demonstrate the same tunability as in the transmissive type just using half the thickness [3]. We discuss the dependence on the angle of incidence for phase shift tunability, which can achieve beam steering and polarization conversion at the same time.

© 2017 Japan Society of Applied Physics, Optical Society of America

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