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. 2024 Jan 2;15:26. doi: 10.1038/s41467-023-44407-4

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© The Author(s) 2024

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Fig. 1 — a Schematic of proposed concept. Metalens focuses 635 nm laser inside fluorescent molecule solution and collects fluorescence light at 670 nm. b Fluorescence spectrum of Alexa 647 molecule. Vertical lines mark target wavelengths of metalens corresponding to laser line and emission maximum of Alexa 647. c Confocal time-resolved setup with integrated metalens. SP shortpass filter, λ/2 half-waveplate, DM dichroic mirror, LP longpass filter, BP bandpass filter, SPAD single photon avalanche diode.