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Inverse design techniques in the context of nanophotonics have helped indiscovery of compact and counter-intuitive structures/shapes. We introduce theconcept of spectral domain inverse design to search through the opticaltrade-space (dispersive permittivity) of nanocomposite metamaterials. Wedevelop a hybrid optimization technique that combines genetic algorithms andgradient descent methods. We utilize this technique to inverse design anultra-thin thermophotovoltaic emitter coating material. Our work can lead to anefficient approach to search for new multi-functional optical/thermalmetamaterials with desired complex permittivity.

Spectral domain inverse design for accelerating nanocomposite metamaterials discovery