In this talk, I will present several design concepts for nanolasers based on collective resonances of dielectric nanoantennas. The interference of collective resonances associated with the bound state in the continuum (BIC) or Van Hove singularity will be discussed in detail based on Mie theory analysis. I will show experimentally and theoretically various directional nanolasers made out of GaAs at cryogenic temperature. By using a more efficient gain material such as CdSe/CdxZn1-xS nanoplatelets or InGaP multi-quantum well, room temperature lasing operation is also illustrated. This work presents design guidelines for high-performance in-plane and out-of-plane lasers, which may find broad applications in nanophotonics.
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