Miniaturization of Multicolor Quantum Dots Lasing Based on 2D Constrained Resonator

Abstract Elevated expectations for laser performance, encompassing broadband tunability, integration, low power consumption, and a low threshold, have emerged within the realms of photonic chips and optoelectronic devices. Nevertheless, achieving multicolor miniaturized lasers within a singular micro‐nano structure remains challenging, hindered by constraints in geometric structure, optical gain, and bandgap considerations. Here, an approach to obtain integrated multicolor lasing beam output simultaneously in a desired direction from a 2D‐constrained micro‐resonator is proposed. The wavelength of the lasing beam is tuned by controlling the size of quantum dots (QDs) in the resonator. Owing to the high density of power within the cavity and the localized surface plasmon resonance on the surface of the Au‐Ag nanowires (NWs), a notably low laser threshold is realized in the micro‐resonator channel. This work introduces a method for realizing an integrated multicolor micro‐laser, providing a pathway toward the implementation of active photonic chips and advanced optoelectronic devices.