Subwavelength-scale semiconductor nanolasers have received wide attention recently for their applications in optical interconnect, bio/chemical sensing, data storage and imaging. We are particularly interested in using nanolasers to reduce the energy consumption in on-chip interconnect. Though many optical sources have been demonstrated on Si, most of them are significantly larger than transistors, making them unattractive for integration with electronic circuits. At Berkeley, we have been developing near-infrared (1.3–1.55 um) semiconductor nanolasers with all three dimensions smaller than a wavelength. Using a nanopatch metalodielectric cavity, we observe lasing in the two most fundamental optical modes. To further reduce the optical mode volume, we have successfully demonstrated a plasmonic crystal laser. Experimental results will be presented.