Multifunctional Integration of Laser, Waveguide, and All-Optical Logic Gate within a Single Ultralong CsPbBr ₃ Nanowire

Semiconductor nanowires (NWs), which use semiconductor materials as optical gain media and simultaneously act as waveguides and optical cavities, can serve as on-chip amplifiers, lasers, modulators, and waveguides. They are widely regarded as key building blocks for next-generation photonic integrated circuits. Realizing these multifunctional applications requires long NWs with high optical gain and superior waveguide properties. In this study, we synthesized single-crystalline CsPbBr₃ NWs with subwavelength widths and lengths up to 300 μm via chemical vapor deposition. The resulting NW exhibits high-quality lasing performance, with a quality factor (<i>Q</i> factor) of 5538, along with outstanding waveguide properties, achieving a low loss coefficient of 0.88 dB mm^-1. Based on these advantages, we developed an integrated laser-waveguide device that performs all-optical OR/AND logic and enables cascaded signal transmission under dual-pulse excitation. Our work highlights the potential of perovskite NWs for integrated nanophotonics.