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We design, fabricate, and characterize multifunctional and compactdiffractive microlenses with sub-wavelength thickness and the capability tosimultaneously focus visible and near-infrared spectral bands at two differentfocal positions with 24% and 15% measured focusing efficiency, respectively.Our technology utilizes high-index and low-loss sputtered hydrogenatedamorphous Si, enabling a sub-wavelength thickness of only 235nm. Moreover, theproposed flat lens concept is polarization insensitive and can be readilydesigned to operate across any desired wavelength regime. Imaging underbroadband illumination with independent focal planes for two targeted spectralbands is experimentally demonstrated, enabling the encoding of the depthinformation of a sample into different spectral images. In addition, with asmall footprint of only 100$\mu$m and a minimum feature size of 400nm, theproposed multifunctional and compact diffractive microlenses can be readilyintegrated with vertical detector arrays to simultaneously concentrate andspectrally select electromagnetic radiation. This provides novel opportunitiesfor spectroscopic and multispectral imaging systems with advanced detectorarchitectures.

Compact dual-band multi-focal diffractive lenses