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Flexible manipulation of terahertz wave reflection using polarization insensitive coding metasurfaces.

Optics express·2017

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Switching terahertz wave with grating-coupled Kretschmann configuration.

|October 19, 2017

Summary

We developed a novel terahertz wave switch using a liquid crystal and a metal grating. This device allows tunable terahertz wave intensity control via applied voltage, achieving a high extinction ratio.

Area of Science:

Optoelectronics
Materials Science
Terahertz Technology

Background:

Terahertz (THz) wave devices require efficient switching mechanisms.
Spoof surface plasmon polaritons (SSPPs) offer a route for THz wave manipulation.
Liquid crystals provide tunable optical properties.

Purpose of the Study:

To demonstrate a novel terahertz wave switch.
To utilize the Kretschmann configuration for SSPP excitation.
To achieve tunable THz intensity control using liquid crystals.

Main Methods:

Fabrication of a device comprising a high-refractive-index prism, liquid crystal, and a periodically grooved metal grating.
Excitation of SSPPs in the attenuated total reflection (ATR) regime.

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Modulation of liquid crystal refractive index via an external applied bias voltage.

Main Results:

Successfully demonstrated a terahertz wave switch based on SSPP excitation.
Achieved tunable control of ATR terahertz wave intensity by adjusting the applied voltage.
Obtained a high extinction ratio of 31.48 dB for the terahertz switch.

Conclusions:

The proposed terahertz switch exhibits good control ability and flexibility.
The device is a potential candidate for future terahertz free-space systems.
Liquid crystal tuning of SSPP excitation provides an effective switching mechanism.