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Modulating sub-THz radiation with current in superconducting metamaterial.

V Savinov¹, V A Fedotov, S M Anlage

¹Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, United Kingdom. vs1106@orc.soton.ac.uk

Physical Review Letters

|February 2, 2013

Summary

Electrical current dynamically modulates superconducting metamaterial transmission. Mechanisms include superconductivity suppression via magnetic fields and heat, achieving 45% modulation depth.

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Area of Science:

Condensed Matter Physics
Metamaterials Science
Superconductivity

Background:

Superconducting metamaterials offer unique electromagnetic properties.
Dynamic control of these properties is crucial for device applications.

Purpose of the Study:

To demonstrate dynamic modulation of subterahertz transmission in a superconducting metamaterial using electrical current.
To identify the physical mechanisms responsible for this modulation.

Main Methods:

Fabrication of a 2D superconducting metamaterial network from niobium thin film.
Applying electrical current to induce modulation.
Analyzing transmission spectra in the subterahertz range.

Main Results:

Achieved dynamic modulation of subterahertz transmission by up to 45%.
Identified magnetic field suppression of superconductivity and heat dissipation as key modulation mechanisms.
Demonstrated a bandwidth of at least 100 kHz.

Conclusions:

Electrical current provides an effective method for dynamic control of superconducting metamaterial transmission.
The approach is potentially applicable to other superconducting materials in THz and subterahertz frequencies.