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Electrically reconfigurable split ring resonator covered by nematic liquid crystal droplet
Optics Express
|December 2, 2016
Summary
This study demonstrates an electrically reconfigurable split ring resonator using liquid crystals. Applying voltage tunes the magnetic resonance frequency and transmission phase, showing potential for tunable metasurfaces.
Area of Science:
- Metamaterials and Nanophotonics
- Liquid Crystal Technology
Background:
- Split ring resonators (SRRs) are fundamental metamaterial components.
- Liquid crystals (LCs) offer tunable dielectric properties with applied electric fields.
Purpose of the Study:
- To experimentally demonstrate an electrically reconfigurable SRR using a nematic liquid crystal droplet.
- To investigate the effect of applied bias voltage on the magnetic resonance of the SRR.
- To explore the influence of LC droplet height on the frequency tuning range.
Main Methods:
- Fabrication of a split ring resonator.
- Covering the SRR with a sessile droplet of nematic liquid crystal.
- Application of external bias voltage to induce LC molecular reorientation.
- Measurement of magnetic resonance frequency and transmission phase changes.
Main Results:
- A gradual decrease in magnetic resonance frequency by 237 MHz was observed with applied bias voltage.
- The transmission phase was modulated by over 100 degrees.
- Increased droplet height led to an enhanced frequency tuning range due to greater capacitance differences.
Conclusions:
- Electrically tunable SRRs using LC droplets are feasible.
- The proposed device enables significant modulation of electromagnetic response.
- This technology holds promise for developing reconfigurable metasurfaces and advanced applications.
