Integrated quantum emitters now emit light with greater control

Jun Ren of The University of Hong Kong and colleagues have developed a new method for controlling the direction of light emitted from quantum emitters. The researchers implemented Fourier-transform analysis of radiation patterns and a quantitative metric, iso-frequency contour straightness, to systematically evaluate directional quality of emission in photonic crystal slabs. This work demonstrates single-emitter radiation efficiency enhancement alongside low-loss unidirectional propagation, and achieves scalable intensity amplification and superradiant emission through cooperative effects. The combination of photonic band engineering and collective emitter coupling is able to realize spatiotemporal coherence control in quantum emitter arrays. Iso-frequency contour straightness is now a quantitative benchmark for evaluating the…