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- W4381551796 abstract "THz quantum cascade lasers (QCLs) based on double metal waveguides feature broadband and high-temperature devices for use in spectroscopy and sensing. However, their extreme field confinement produces poor output coupling efficiencies and divergent far-fields. Here, we present a planarized THz QCL with an inverse-designed end facet reflector coupled to a surface-emitting patch array antenna. All the components have been optimized for octave-spanning spectral bandwidths between 2-4 THz and monolithically integrated on the same photonic chip. We demonstrate this experimentally on broadband THz QCL frequency combs, with measured devices showing a seven-fold improvement in slope efficiency compared to devices with a cleaved facet. They feature peak powers of up to 13.5 mW with surface emission into a narrow beam with a divergence of (17.0{deg}x 18.5{deg}), while broadband fundamental and harmonic comb states spanning up to 800 GHz are observed." @default.
- W4381551796 created "2023-06-22" @default.
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- W4381551796 date "2023-06-17" @default.
- W4381551796 modified "2023-10-16" @default.
- W4381551796 title "Broadband surface-emitting THz laser frequency combs with inverse-designed integrated reflectors" @default.
- W4381551796 doi "https://doi.org/10.48550/arxiv.2306.10360" @default.
- W4381551796 hasPublicationYear "2023" @default.
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