Switchable Broadband Terahertz Absorbers Based on Conducting Polymer-Cellulose Aerogels

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Terahertz (THz) technologies require broadband absorbers with switchable properties.
• Optically switchable THz materials are scarce, with limited modulation bandwidths.
• Developing materials with large, broadband modulation in absorption or transmission is a critical challenge.

Purpose of the Study:

• To demonstrate conducting polymer-cellulose aerogels as broadband THz modulators.
• To investigate the modulation range and optical properties of these aerogels.
• To explore potential applications including de-frosting.

Main Methods:

• Fabrication of conducting polymer-cellulose aerogels.
• Characterization of THz transmission and reflection properties.
• Chemical modification to alter surface hydrophilicity.

Main Results:

• Achieved large modulation range (13% to 91% absolute transmission) for broadband THz light.
• Maintained low specular reflection loss (< -30 dB).
• Demonstrated solar-induced de-frosting capability due to broadband optical absorption.

Conclusions:

• Conducting polymer-cellulose aerogels offer significant broadband THz modulation.
• The observed modulation is linked to the anomalous optical conductivity of conducting polymers.
• These sustainable, low-cost aerogels are promising for next-generation THz devices and thermal management.