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Plasmon lasers create and sustain intense and coherent optical fields belowlight's diffraction limit with the unique ability to drastically enhancelight-matter interactions bringing fundamentally new capabilities tobio-sensing, data storage, photolithography and optical communications.However, these important applications require room temperature operation, whichremains a major hurdle. Here, we report a room temperature semiconductorplasmon laser with both strong cavity feedback and optical confinement to1/20th of the wavelength. The strong feedback arises from total internalreflection of surface plasmons, while the confinement enhances the spontaneousemission rate by up to 20 times.

Room temperature plasmon laser by total internal reflection