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.
(S16) gives P (uc) in,crit(Bs) = D2κ0 4D2 1arcosh2( √ 2)g B2 s .(S22) The corresponding pump-power ratio is therefore P (mc) in (Bs) P (uc) in,crit(Bs) = h κ0 +κ m tanh arcosh( √
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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.