Organic Nanowire Single-Mode Laser from a Hybrid Bound State in the Continuum

Nanoscale single-mode lasers are a class of excellent coherent light sources for future on-chip integrated photonic circuits due to their high monochromaticity and beam quality. However, the lasing of the desired mode cannot completely prevent neighboring resonances because of the competition between the broad gain bandwidth of materials and the free spectral range. In this study, we have employed the high-quality characteristics of the bound state in the continuum (BIC) to successfully realize the desired single-mode lasing emission from a large-sized organic nanowire on the three-dimensional photonic crystal (PhC) substrate. Benefited from the tunability of PhCs, the wavelength of single-mode laser can be effectively regulated due to the pronounced periodicity-dependent characteristics of BICs. Importantly, this device exhibits a robust single-mode laser due to the immunity of the defects of PhCs. Our experimental finding offers significant insights for developing synthetic lasing devices toward next-generation optoelectronic integrated devices.