Abstract
Photonically tailored thermal emission can boost the efficiency of thermophotovoltaics through selective emission of above-bandgap energies. 1D photonic crystals are attractive candidates for this purpose, providing strong modulation of the optical density of states at the photonic band edge. However, optimization of the emission spectrum of such multilayer structures is challenging due to the large number of parameters involved. Here, we present the inverse design of an Al2O3/W multilayer using an evolutionary optimization algorithm. The experimental realization of the optimized design shows emission close to unity at above-bandgap energies while suppressing up to 40% of below-bandgap energies.
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