Polarization-Selective Out-Coupling of Whispering-Gallery Modes

Sedlmeir F, Foreman MR, Vogl U, Zeltner R, Schunk G, Strekalov DV, Marquardt C, Leuchs G, Schwefel HGL (2017)


Publication Type: Journal article

Publication year: 2017

Journal

Book Volume: 7

Article Number: 024029

Journal Issue: 2

DOI: 10.1103/PhysRevApplied.7.024029

Abstract

Whispering-gallery mode (WGM) resonators are an important platform for linear, nonlinear, and quantum optical experiments. In such experiments, independent control of in-coupling and out-coupling rates to different modes can lead to higher conversion efficiencies and greater flexibility in the generation of nonclassical states based on parametric down-conversion. In this work, we introduce a scheme that enables selective out-coupling of WGMs belonging to a specific polarization family, while the orthogonally polarized modes remain largely unperturbed. Our technique utilizes material birefringence in both the resonator and the coupler such that a negative (positive) birefringence allows for polarization-selective coupling to TE (TM) WGMs. We formulate a refined coupling condition suitable for describing the case where the refractive indices of the resonator and the coupler are almost the same, from which we derive a criterion for polarization-selective coupling. Finally, we experimentally demonstrate our proposed method using a lithium niobate disk resonator coupled to a lithium niobate prism, where we show a 22-dB suppression of coupling to TM modes relative to TE modes.

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APA:

Sedlmeir, F., Foreman, M.R., Vogl, U., Zeltner, R., Schunk, G., Strekalov, D.V.,... Schwefel, H.G.L. (2017). Polarization-Selective Out-Coupling of Whispering-Gallery Modes. Physical Review Applied, 7(2). https://doi.org/10.1103/PhysRevApplied.7.024029

MLA:

Sedlmeir, Florian, et al. "Polarization-Selective Out-Coupling of Whispering-Gallery Modes." Physical Review Applied 7.2 (2017).

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