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We present a novel design for a single-mode, truly sub-wavelength THz disklaser based on a nano-composite gain medium comprising an array ofmetal/ferromagnetic point contacts embedded in a thin dielectric layer.Stimulated emission of light occurs in the point contacts as a result ofspin-flip relaxation of spin-polarized electrons that are injected from theferromagnetic side of the contacts. Ultra-high electrical current densities inthe contacts and a dielectric material with a large refractive index, neithercondition being achievable in conventional semiconductor media, allows thethresholds of lasing to be overcome for the lowest-order modes of the disk,hence making single-mode operation possible.

Sub-Wavelength Terahertz Spin-Flip Laser Based on a Magnetic Point-Contact Array