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On-Demand Dynamic Terahertz Polarization Manipulation Based on Pneumatically Actuated Metamaterial.

Yongchao Zou¹, Yan Wang², Yangjian Zeng²

¹College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China.

|November 25, 2023

Summary

This study introduces a novel tunable metamaterial for on-demand terahertz (THz) polarization manipulation. The device offers flexible switching between linear and circular polarization conversions by controlling pneumatic actuation pressure.

Keywords:

dynamic modulation pneumatic actuation polarization manipulation terahertz metamaterial

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Area of Science:

Terahertz (THz) Photonics
Metamaterials
Optics and Photonics

Background:

Polarization manipulation is crucial for advanced optical systems.
Existing methods often lack tunability or operate over narrow frequency bands.

Purpose of the Study:

To propose and demonstrate a new tuning strategy for on-demand polarization manipulation at THz frequencies.
To achieve flexible switching of polarization conversion capabilities using a single device.

Main Methods:

Development of a pneumatically actuated metamaterial.
Experimental investigation of polarization conversion functionalities.
Analysis of the intrinsic tuning mechanism via actuation pressure control.

Main Results:

Successful demonstration of three distinct polarization conversion modes within the 1.3-1.5 THz band.
Achieved mutual conversion between linear and circular polarization (quarter-wave plate functionality).
Demonstrated handedness inversion and retention for circular polarizations (helicity inverter/keeper functionality).

Conclusions:

The proposed pneumatically actuated metamaterial offers a versatile platform for dynamic THz polarization control.
This technology enables on-demand switching of polarization states, advancing THz optical device capabilities.