Nonlinearity-induced reciprocity breaking in a single non-magnetic Taiji resonator

Abstract

We report on the demonstration of an effective, nonlinearity-induced non-reciprocal behavior in a single non-magnetic multi-mode Taiji resonator. Non-reciprocity is achieved by a combination of an intensity-dependent refractive index and of a broken spatial reflection symmetry. Continuous wave power dependent transmission experiments show non-reciprocity and a direction-dependent optical bistability loop. These can be explained in terms of the unidirectional mode coupling that causes an asymmetric power enhancement in the resonator. The observations are quantitatively reproduced by a numerical finite-element theory and physically explained by an analytical coupled-mode theory. This nonlinear Taiji resonator has the potential of being the building block of large arrays where to study topological and/or non-Hermitian physics. This represents an important step towards the miniaturization of nonreciprocal elements for photonic integrated networks.

10 pages, 7 figures

References in corpus (4)

• Nonlinearity-induced photonic topological insulator
• Broadband on-chip optical non-reciprocity using phase modulators
• Inter-mode reactive coupling induced by waveguide-resonator interaction
• Kerr-Nonlinearity-Induced Mode-Splitting in Optical Microresonators

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• Optical isolators based on non-reciprocal four-wave mixing
• Influence of the bus waveguide on the linear and nonlinear response of a taiji microresonator
• Theory of quantum spin-Hall topological lasers
• An interferometric method to estimate the eigenvalues of a Non-Hermitian two-level optical system