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

Physical Review Applied American Physical Society

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.

Authors with CRIS profile

Christoph Marquardt Institut für Optik, Information und Photonik Gerhard Leuchs Lehrstuhl für Experimentalphysik (Optik)

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) University of Otago NZ New Zealand (NZ)

How to cite

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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