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Volumetric Metaoptics for Compact and Low-Power Spectroscopy

Spectroscopy is a critical technology for remote sensing, but realizing compact low-power spectrometers remains challenging. Moreover, there is an obvious need of low-power, low-mass, and low-volume medium spectral resolution spectrometers for a variety of space-based instruments. This work combines a high-Q Fabry-Perot resonator with an inverse-designed, volumetric metaoptics device made of stacked Si layers to form a highly compact, low-power, and broadband spectrometer. The resonator consists of two distributed Bragg reflectors made of cascaded Silicon membranes, each curved by an SiO2 thin film to support small mode volume resonances. The metaoptics separate the various resonances (spectrally separated by the free-spectral range of the cavity) to their own direct detector.