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Subwavelength terahertz spin-flip laser based on a magnetic point-contact array.

Robert I Shekhter¹, Anatoliy M Kadigrobov, Mats Jonson

¹Department of Physics, University of Gothenburg, SE-412 96 Göteborg, Sweden.

|June 21, 2011

Summary

We propose a novel terahertz disk laser design using nanocomposite gain media. This approach enables single-mode operation at subwavelength scales, overcoming limitations of conventional semiconductor lasers.

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Area of Science:

Physics
Materials Science
Electrical Engineering

Background:

Conventional semiconductor lasers face limitations in achieving subwavelength scales and single-mode operation.
Terahertz (THz) technology requires innovative laser designs for advanced applications.

Purpose of the Study:

To theoretically design a single-mode, truly subwavelength terahertz disk laser.
To explore a novel gain medium utilizing normal-metal/ferromagnetic (FM) point contacts.

Main Methods:

Theoretical design of a nanocomposite gain medium with FM point contacts in a dielectric layer.
Analysis of stimulated emission via spin-flip relaxation of spin-polarized electrons.
Investigating conditions for overcoming lasing thresholds using ultrahigh current densities and high refractive index dielectrics.

Main Results:

Demonstrated feasibility of a single-mode, subwavelength THz disk laser.
Identified spin-flip relaxation as the mechanism for stimulated emission.
Showcased the advantage of nanocomposite gain media over conventional semiconductors for THz lasing.

Conclusions:

The proposed design offers a viable pathway to single-mode, subwavelength THz disk lasers.
This innovation could advance THz spectroscopy, imaging, and communication systems.