Optical Fiber-Based Laser Confocal Microscope with a Metalens

We demonstrated a fiber optical based laser confocal microscope with a planar metalens as a focusing element. The metalens is used to replace a bulky traditional focusing lens in a standard confocal microscope configuration. The metalens (f=4 mm) is designed to operate at 660 mm with a measured 4.29 μm FWHM spot size.