Scaling of metal-clad InP nanodisk lasers: optical performance and thermal effects

A key component for optical on-chip communication is an efficient light source. However, to enable low energy per bit and local integration with Si CMOS, devices need be further scaled down. In this work, we fabricate micro- nanolasers of different shapes in InP by direct wafer bonding on Si. Metal-clad cavities have been proposed as means scale dimensions beyond the diffraction limit exploiting hybrid photonic-plasmonic modes. Here, explore size scalability whispering-gallery mode sources cladding sidewalls device Au. We demonstrate room temperature lasing upon excitation Au-clad diameters down 300 nm, while purely photonic counterparts show only 500 nm. Numerical thermal simulations support experimental findings confirm improved heat-sinking capability devices, suggesting a reduction 450 - K metal-clad nanodisk laser, compared one without This would provide substantial performance benefits even absence plasmonic mode. These results give insight into designs downscale integrated lasers