Photon avalanche (PA) upconversion in lanthanide nanosystems represents a groundbreaking discovery, demonstrating an optical nonlinearity exceeding 50. This remarkable sensitivity to even the slightest light perturbations unlocks new possibilities for ultrasensitive biosensing, super-resolution imaging, and a range of other applications. This review delves into the fundamental mechanisms.. Amplify photo-avalanche nonlinearity beyond 500Light Sci Appl. 2025 Aug 19;14 (1):281. doi: 10.1038/s41377-025-01950-7.
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Commercial single-photon avalanche diode module for optical photons A single-photon avalanche diode (SPAD), also called Geiger-mode avalanche photodiode[1] (G-APD or GM-APD[2]) is a solid-state photodetector within the same family as photodiodes and avalanche photodiodes (APDs), while also being fundamentally linked with basic diode behaviours.. Holmium-doped nanoparticles exhibit a novel parallel photon avalanching mechanism, offering controlled chromaticity and enabling sub-diffraction, multicolour bio-imaging upon excitation with a.
