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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.
Optics Letters
|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.
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.
