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Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss mie scatterer

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eLight 2023年第1期3卷 66-74页

作者： Hwaseob Lee Ali Kecebas Feifan Wang Lorry Chang Sahin K.Ozdemir Tingyi Gu Department of Electrical and Computer Engineering University of DelawareNewarkDE 19716USA Department of Engineering Science and Mechanics Pennsylvania State UniversityUniversity ParkPA 16802USA Materials Research Institute Pennsylvania State UniversityUniversity ParkPA 16802USA

Non-Hermitian systems with their spectral degeneracies known as exceptional points(EPs)have been explored for lasing,controlling light transport,and enhancing a sensor’s response.A ring resonator can be brought to an EP by controlling the coupling between its frequency degenerate clockwise and counterclockwise traveling *** has been typically achieved by introducing two or more nanotips into the resonator’s mode *** this method provides a route to study EP physics,the basic understanding of how the nanotips’shape and size symmetry impact the system’s non-Hermicity is missing,along with additional loss from both in-plane and out-of-plane *** limited resonance stability poses a challenge for leveraging EP effects for switches or modulators,which requires stable cavity resonance and fixed laser-cavity *** we use lithographically defined asymmetric and symmetric mie scatterers,which enable subwavelength control of wave transmission and reflections without deflecting to additional radiation *** show that those pre-defined mie scatterers can bring the system to an EP without post tuning,as well as enable chiral light transport within the ***,the mie scatterer results in enhanced quality factor measured on the transmission port,through coherently suppressing the backscattering from the waveguide surface *** proposed device platform enables pre-defined chiral light propagation and backscattering-free resonances,needed for various applications such as frequency combs,solitons,sensing,and other nonlinear optical processes such as photon blockade,and regenerative oscillators.

关键词： Non-Hermicity Exceptional point mie scatterers Microring resonator Silicon photonics

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