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On‐chip optical microresonators are essential building blocks in integrated optics. The ability to arbitrarily engineer their resonant frequencies is crucial for exploring novel physics in synthetic frequency dimensions and practical applications like nonlinear optical parametric processes and dispersion‐engineered frequency comb generation. Photonic crystal ring (PhCR) resonators are a versatile...
Spectral Engineering
A microring resonator with specially designed geometric modulation profiles along the ring circumference is used to arbitrarily engineer the spectral properties of optical resonances in the anisotropic lithium niobate platform. Using this novel design, a frequency‐domain “mirror” is constructed to precisely control the optical energy flow in the synthetic frequency dimension....