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Liquid-based transparent, wideband and reconfigurable absorber/reflector
Optics Express
|October 12, 2022
Summary
This study presents a switchable, tunable, and optically transparent wideband absorber/reflector using Polydimethylsiloxane (PDMS) and Indium Tin Oxide (ITO). Its frequency spectrum can be adjusted by changing saline water concentration.
Area of Science:
- Electromagnetics
- Materials Science
- Optics
Background:
- Developing tunable and switchable electromagnetic devices is crucial for advanced applications.
- Existing absorbers/reflectors often lack optical transparency or tunable frequency characteristics.
Purpose of the Study:
- To introduce an optically transparent, wideband absorber/reflector with switchable states and tunable frequency spectrum.
- To demonstrate a novel structure utilizing microchannel-embedded Polydimethylsiloxane (PDMS) and Indium Tin Oxide (ITO).
Main Methods:
- Fabrication of a layered structure with microchannels in PDMS and an Indium Tin Oxide (ITO) layer.
- Switching functionality achieved by controlling water injection/discharge.
- Tunability implemented by varying saline water concentration.
Main Results:
- Achieved a switchable frequency band from 7.9 to 34.4 GHz (125.2% fractional bandwidth).
- Demonstrated tunable properties by adjusting saline water concentration.
- Confirmed robust performance across various polarizations and incident angles, with consistent simulated and measured results.
Conclusions:
- The proposed optically transparent absorber/reflector offers significant potential for dynamic electromagnetic spectrum control.
- The device exhibits excellent performance, switchability, and tunability, validated by experimental fabrication and testing.
