Fig. 1: Dual-wavelength metalens for single molecule detection.
From: Dual-wavelength metalens enables Epi-fluorescence detection from single molecules
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.
