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Giant nonlinearity in upconversion nanoparticles

Co-doping ytterbium and praseodymium ions in photon avalanche nanoparticles rapidly builds up huge optical nonlinearities, enabling confocal microscopy to achieve super-resolution imaging at high speed.

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Fig. 1: Schematic of cross-relaxation-assisted photon avalanche in upconversion nanocrystals.


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Correspondence to Dayong Jin.

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Chen, C., Jin, D. Giant nonlinearity in upconversion nanoparticles. Nat. Photon. 16, 553–554 (2022).

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