Fig. 3: Broadband and scalable performances of SUAD topological pumping. | Nature Communications

Fig. 3: Broadband and scalable performances of SUAD topological pumping.

From: Superadiabatic topological pumping on photonic chips

Fig. 3: Broadband and scalable performances of SUAD topological pumping.

a(i) Predicted pumping fidelity with input wavelength ranging from 600 to 1000 nm for SUAD (L = 60 mm, top shadow for \({{{\mathcal{F}}}} > 0.95\)) and Rabi-flopping (L = 40 mm) schemes; (ii) Measured photographs at the end facets of the two samples working at specified four wavelengths instead of 808 nm. b(i) Calculated light intensity profiles at the output facet for different numbers of waveguides in CTAP (top) and SUAD (bottom) pumping schemes. Inset: Pumping fidelity trends of CTAP and SUAD schemes with different numbers of waveguides. Light propagation patterns for N = 35 (CTAP) and N = 36 (SUAD). (ii) Measured photographs at the end facets of five samples with N = 20, 24, 28, 32, and 36, respectively. \({{{\mathcal{F}}}}\)-wavelength data in a(i) and intensity data in b(i) are obtained by FES. \({{{\mathcal{F}}}}\)-ϵ data in a(i) and \({{{\mathcal{F}}}}\) data (inset) in b(i) are obtained by solving CME.

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