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The as-grown nanocavities were dry transferred onto 400-nm-thick SiO2-coated Si substrates for optical measurements performed using a home-built microscope equipped with objectives (Nikon). The excitation power was adjusted using neutral density filters. For spatially resolved micro-PL spectroscopy, a continuous-wave 325-nm He-Cd laser (Kimmon Koha) was focused by an objective [60×, 0.7 numerical aperture (NA)] to a beam spot size of ~3 μm with a power density range of 0.67 to 2.2 kW/cm2, corresponding to an estimated excited EHP density of 8.8 × 1016 to 3.5 × 1017 cm−3. PL spectra were collected using the same objective and an optical fiber on the focal image plane, resulting in a spatial resolution of less than 300 nm. The signal collected by the optical fiber was coupled to a 0.5-m spectrometer (Acton) and a cooled charge-coupled device (Pixis 2K, Princeton Instruments) with a spectral resolution of 0.1 nm. The lasing characteristics of the nanocavities were examined using the same optical setup but with excitation by a pulsed-wave 355-nm laser (Teem Photonics) with a repetition rate of 1 kHz and a pulse width of 350 ps, which was focused by a 20×, 0.45 NA objective to a beam spot size of ~14 μm. Temperature-dependent measurements were conducted using a liquid nitrogen–cooled cryostat (Janis Research).

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