Polarization-Selective Out-Coupling of Whispering-Gallery Modes

Sedlmeir, Florian; Foreman, Matthew R.; Vogl, Ulrich; Zeltner, Richard; Schunk, Gerhard; Strekalov, Dmitry V.; Marquardt, Christoph; Leuchs, Gerd; Schwefel, Harald G. L.

doi:10.1103/PhysRevApplied.7.024029

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Polarization-Selective Out-Coupling of Whispering-Gallery Modes

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Sedlmeir, Florian
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201063

Foreman, Matthew R.
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Imperial Coll London, Dept Phys Blackett Lab;

/persons/resource/persons201225

Vogl, Ulrich
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201242

Zeltner, Richard
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201187

Schunk, Gerhard
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201206

Strekalov, Dmitry V.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201126

Marquardt, Christoph
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201115

Leuchs, Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Sedlmeir, F., Foreman, M. R., Vogl, U., Zeltner, R., Schunk, G., Strekalov, D. V., et al. (2017). Polarization-Selective Out-Coupling of Whispering-Gallery Modes. PHYSICAL REVIEW APPLIED, 7(2): 024029. doi:10.1103/PhysRevApplied.7.024029.

Cite as: https://hdl.handle.net/21.11116/0000-0000-7E1A-7

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.