Characterization of some biological materials relies on absorption imaging. In this paper, a highly translucent flat two-layer structure as part of an imaging system called spectrometer is proposed that has a very high numerical aperture (NA) and high quality factor (QF). The structure can be used to identify micro-biological materials with previously known absorption rate, under single-wavelength electromagnetic absorbance imaging. The proposed two-layer structure is composed of a double-near-zero (DNZ) slab coupled to a high-index dielectric slab with a specific thickness. In DNZ materials, both the permittivity and permeability are close to zero. The DNZ slab operates as a flat lens, and the very high-index dielectric slab functions as a high QF monochromator that at the same time increases NA of the lens without affecting translucidity of the two-layer structure. At the end, a transformation optics (TO) based nonlinear lens is introduced that can be replaced as the DNZ layer. The focus of the nonlinear lens can be tuned by tuning its material parameters.
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