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Spectrometers with hetero-integration capabilities and miniaturized features are required for lab-on-chip applications such as point-of-care diagnosis, the internet of things, and others to acquire real-time spectral data. ....
A metasurface hologram is an ultra-thin surface that is capable of arbitrarily shaping and projecting laser beams to extremely wide angles. However, due to the high coherence of laser light and inevitable defects in the metasurface, holographic images produced by meta-holograms suffer from deleterious artifacts that are extremely difficult to remove. A US-China team developed an efficient method to suppress holographic defects by fine-tuning the spatial coherence of laser illumination with a novel laser. ....