A lithographically programmed meta-coupler in Si3N4 resonators concentrates pump coupling while preserving low loss for other comb lines, yielding nearly 2x wider 3 dB bandwidth and up to 5x more emitted comb power.
In the unit coupler, the full soliton spectrum incurs the external-coupling contributionκ m, so the bandwidth is limited by the total loss rateκ 0 +κ m
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2026 1verdicts
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Program gain and loss for broadband soliton microcombs
A lithographically programmed meta-coupler in Si3N4 resonators concentrates pump coupling while preserving low loss for other comb lines, yielding nearly 2x wider 3 dB bandwidth and up to 5x more emitted comb power.