Terahertz rewritable wavefront modulator based on indium oxide and DMSO-doped PEDOT:PSS

Area of Science:

• Materials Science
• Optics and Photonics
• Condensed Matter Physics

Background:

• Terahertz (THz) wavefront modulation is crucial for advanced optical imaging and sensing.
• Existing THz modulators often lack reconfigurability and efficient control mechanisms.

Purpose of the Study:

• To propose and demonstrate an optically rewritable and electrically erasable THz wavefront modulator.
• To investigate the performance of a novel device based on indium oxide and PEDOT:PSS for THz applications.

Main Methods:

• Fabrication of a three-layer structure: In2O3/PEDOT:PSS/quartz.
• Optical excitation to induce THz transmission modulation.
• Electrical erasing of the modulated function using a bias voltage.
• Demonstration of THz Fresnel plates and holographic devices.

Main Results:

• The proposed modulator effectively weakens THz transmission upon optical excitation.
• Optically written THz Fresnel plates demonstrated focusing capabilities.
• The device function is stable in a nitrogen environment and erasable within 10 seconds with a 22V bias.
• Rewritable THz holographic devices were successfully realized.

Conclusions:

• The developed In2O3/PEDOT:PSS device offers a promising platform for optically rewritable and electrically erasable THz wavefront modulation.
• This technology paves the way for new tunable optical imaging elements and advanced THz devices.