Numerical Investigation of Light Emission from Quantum Dots Embedded into On‐Chip, Low‐Index‐Contrast Optical Waveguides

Hoehne, Theresa; Schnauber, Peter; Rodt, Sven; Reitzenstein, Stephan; Burger, Sven

doi:10.1002/pssb.201800437

Cited by 10 publications

(8 citation statements)

References 37 publications

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“…2(c) and (d), the Purcell factor of y-polarized dipole F y is more sensitive to the dimensional variation than that of x-polarized dipole F x . This is because the oscillation axis of the y-polarized emitter (y-axis) is perpendicular to the waveguide crosssection (xz-plane) [32]. Next, we consider the sum of the power extracted from the top and bottom outputs, P M,top and P M,bot , as shown by the arrows in Fig.…”

Section: Designs and Resultsmentioning

confidence: 99%

“…Next, a stronger Purcell enhancement can be achieved by the constructive interference between the forwardpropagating photons and the ones reflected at the bottom mirror [32], which requires the dipole to be precisely at an antinode relative to the mirror. We first place the emitter at a random distance L to the bottom mirror to obtain a field profile, where we can observe the position of the antinodes.…”

Section: B Design Concept and Results For A Dbr In A Ridge Waveguidementioning

confidence: 99%

“…where P 0 is the power emitted by the QD in the bulk material. As the figure of merit, the coupling efficiency of an xy-polarized dipole is given by [32]:…”

Section: General Conceptmentioning

confidence: 99%

“…1. When the dipole is on the central axis of the waveguide, it always yields P M,y = 0 [27,32]. Therefore, we simplify the notation in the following by P M only referring to P M,x .…”

Section: General Conceptmentioning

confidence: 99%

See 3 more Smart Citations

Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources

Wang,

Vannucci,

Burger

et al. 2022

Preprint

Self Cite

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We report a numerical design procedure for pursuing a near-unity coupling efficiency in quantum dot-cavity ridge waveguide single-photon sources by performing simulations with the finite element method. Our optimum design which is based on a 1D nanobeam cavity, achieves a high source efficiency xy of 97.7% for an isotropic in-plane dipole, together with a remarkable Purcell factor of 38.6. Such a good performance is mainly attributed to the high index contrast of GaAs/SiO2 and a careful cavity design achieving constructive interference and low scattering losses. Furthermore, we analyze the bottleneck of the proposed platform, which is the mode mismatch between the cavity mode and the Bloch mode in the nanobeam. Accordingly, we present the optimization recipe of an arbitrarily high-efficiency on-chip single-photon source by implementing a taper section, whose high smoothness is beneficial to gradually overcoming the mode mismatch, and therefore leading to a higher Purcell factor and source efficiency. Finally, we see good robustness of the source properties in the taper-nanobeam system under the consideration of realistic fabrication imperfections on the hole variation.

show abstract

Section: Designs and Resultsmentioning

confidence: 99%

Section: B Design Concept and Results For A Dbr In A Ridge Waveguidementioning

confidence: 99%

“…where P 0 is the power emitted by the QD in the bulk material. As the figure of merit, the coupling efficiency of an xy-polarized dipole is given by [32]:…”

Section: General Conceptmentioning

confidence: 99%

“…1. When the dipole is on the central axis of the waveguide, it always yields P M,y = 0 [27,32]. Therefore, we simplify the notation in the following by P M only referring to P M,x .…”

Section: General Conceptmentioning

confidence: 99%

See 2 more Smart Citations

Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources

Wang,

Vannucci,

Burger

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…where P 0 is the power emitted by the QD in the bulk material. As the figure of merit, the coupling efficiency of an xy-polarized dipole is given by [37]:…”

Section: General Conceptmentioning

confidence: 99%

Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources

Wang

Vannucci

Burger

et al. 2022

Mater. Quantum. Technol.

Self Cite

View full text Add to dashboard Cite

We report a numerical design procedure for pursuing a near-unity coupling efficiency in quantum dot-cavity ridge waveguide single-photon sources by performing simulations with the finite element method. Our optimum design which is based on a 1D nanobeam cavity, achieves a high source efficiency εxy of 97.7% for an isotropic in-plane dipole, together with a remarkable Purcell factor of 38.6. Such a good performance is mainly attributed to the high index contrast of GaAs/SiO2 and a careful cavity design achieving constructive interference and low scattering losses. Furthermore, we analyze the bottleneck of the proposed platform, which is the mode mismatch between the cavity mode and the Bloch mode in the nanobeam. Accordingly, we present the optimization recipe of an arbitrarily high-efficiency on-chip single-photon source by implementing a taper section, whose high smoothness is beneficial to gradually overcoming the mode mismatch, and therefore leading to a higher Purcell factor and source efficiency. Finally, we see good robustness of the source properties in the taper-nanobeam system under the consideration of realistic fabrication imperfections on the hole variation.

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Numerical Investigation of a Coupled Micropillar ‐ Waveguide System for Integrated Quantum Photonic Circuits

Roche,

Betz,

Yang

et al. 2024

Adv Quantum Tech

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The on‐chip resonant excitation of single quantum dots (QDs) via integrated microlasers represents an effective and scalable method for integrated quantum photonics applications based on on‐demand single‐photon emitters. In this study, the design and numerical optimization of the evanescent coupling between whispering gallery modes (WGMs) of a micropillar resonator and a nearby single‐mode ridge waveguide in the Al(Ga)As/GaAs material system are presented. In this study, such systems are examined within a wavelength range of 930 nm, which is suitable for resonant excitation of typical self‐assembled InGaAs quantum dots. In particular, the coupling and the transmitted optical power of a WGM resonator to a ridge waveguide are examined for a range of gap spacings, with the objective of optimizing the photon coupling efficiency and Q‐factor of the monolithically integrated nanophotonic system. The findings of this study enable to identify the best device parameters for subsequent device fabrication. The findings establish a foundation for the production of highly effective photonic quantum circuits through the use of WGM microlasers integrated into evanescently coupled waveguide systems, including resonantly excited single quantum dots.

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Numerical Investigation of Light Emission from Quantum Dots Embedded into On‐Chip, Low‐Index‐Contrast Optical Waveguides

Cited by 10 publications

References 37 publications

Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources

Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources

Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources

Numerical Investigation of a Coupled Micropillar ‐ Waveguide System for Integrated Quantum Photonic Circuits

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