Stimulated Emission from α-Sn nanoparticles on silicon

Following the recent low-temperature synthesis of a-Sn nanoparticles on silicon, we report the first experimental results indicating stimulated emission from these nanostructures in the THz range. To enhance the emission, the nanoparticles were integrated into a slot-array antenna with a resonant frequency matched to the nanoparticle bandgap. Transmission spectra were measured using a purpose-designed FTIR setup. A distinct peak in the optical density was observed at a wavelength of approximately 15 um, which can be consistently interpreted as stimulated emission from the nanoparticles. Combined with the fully CMOS-compatible fabrication process, these results highlight the strong potential of this platform for future THz photonic devices.