A silicon bar nanostructure metalens on CaF2 substrate delivers broadband achromatic focusing across 1800-2300 nm with focal-length variation limited to 6 percent per FDTD simulations.
The absorption spectrum of water vapor in the 2.2µm trans- parency window: High sensitivity measurements and spectroscopic database
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Broadband Achromatic Metalens for the Short-Wave Infrared
A silicon bar nanostructure metalens on CaF2 substrate delivers broadband achromatic focusing across 1800-2300 nm with focal-length variation limited to 6 percent per FDTD simulations.