Correlations between axial and lateral emission of coupled quantum dot–micropillar cavities

Musiał, Anna; Hopfmann, Caspar; Heindel, Tobias; Gies, Christopher; Florian, Matthias; Leymann, H. A. M.; Foerster, A.; Schneider, Christian; Jahnke, F.; Höfling, Sven; Kamp, M.; Reitzenstein, Stephan

doi:10.1103/physrevb.91.205310

Cited by 13 publications

(15 citation statements)

References 49 publications

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“…This setup has a perpendicular configuration of the excitation and the detection paths. The main advantage of side-excitation here is that the laser light is not (partially) blocked by the stop-band of the top DBR [46]. Therefore, an efficient and homogeneous, i.e.…”

Section: Sample Propertiesmentioning

confidence: 99%

Controlling the gain contribution of background emitters in few-quantum-dot microlasers

et al. 2018

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We provide experimental and theoretical insight into single-emitter lasing effects in a quantum dot (QD)-microlaser under controlled variation of background gain provided by off-resonant discrete gain centers. For that purpose, we apply an advanced two-color excitation concept where the background gain contribution of off-resonant QDs can be continuously tuned by precisely balancing the relative excitation power of two lasers emitting at different wavelengths. In this way, by selectively exciting a single resonant QD and off-resonant QDs, we identify distinct single-QD signatures in the lasing characteristics and distinguish between gain contributions of a single resonant emitter and a countable number of off-resonant background emitters to the optical output of the microlaser. Our work addresses the important question whether single-QD lasing is feasible in experimentally accessible systems and shows that, for the investigated microlaser, the single-QD gain needs to be supported by the background gain contribution of off-resonant QDs to reach the transition to lasing. Interestingly, while a single QD cannot drive the investigated micropillar into lasing, its relative contribution to the emission can be as high as 70% and it dominates the statistics of emitted photons in the intermediate excitation regime below threshold.

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Section: Sample Propertiesmentioning

confidence: 99%

Controlling the gain contribution of background emitters in few-quantum-dot microlasers

et al. 2018

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“…side-excitation as used in this study. At the same time it opens up a possibility to collect the signal in the lateral direction, e.g., to monitor the direct QD spontaneous emission into free space or loss channels of the micropillar cavity [28]. The micropillars are structured into the wafer material using a rhombic pattern with an offset (Δrow) of 2.5 µm for each row of micropillars counting from the cleaved edge.…”

Section: Experimental Setup and Sample Preparationmentioning

confidence: 99%

“…The intended role of this rhombic pattern of the micropillar array is to increase the number of micropillar structures available for side-excitation, since it prevents shadowing of micropillars in the first four rows from micropillars closer to the edge and potentially enhances stray-light suppression by spatially separating light scattered by the cleaved edge from the micropillar top facets. For our spectroscopic studies the micropillar sample is mounted inside a helium flow cryostat and kept at a constant temperature of 15 K. We employed an experimental setup (figure 2) in which we excite QDs embedded in micropillars via side-excitation (blue), and detect emission through the top facet using a second independent beam path (red) [14,28]. In the side-excitation beam path we employ a long working distance microscope objective with a numerical aperture (NA) of 0.4 and magnification of 20 times and in the detection beam path an objective with NA = 0.65 and 50 times magnification.…”

Section: Experimental Setup and Sample Preparationmentioning

confidence: 99%

Efficient stray-light suppression for resonance fluorescence in quantum dot micropillars using self-aligned metal apertures

Hopfmann

Musiał

Maier

et al. 2016

Semicond. Sci. Technol.

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Within this work we propose and demonstrate a technological approach to efficiently suppress excitation laser stray-light in resonance fluorescence experiments on quantum dot-micropillars. To ensure efficient stray-light suppression, their fabrication process includes a planarization step and the subsequent covering with a titanium mask to fabricate self-aligned apertures at the micropillar positions. These apertures aim at limiting laser straylight in side-excitation vertical-detection configuration, while enabling detection of the optical signal through the top facet of the micropillars. Beneficial effects of these apertures are proven and quantitatively evaluated within a statistical study in which we determine and compare the stray-light suppression of 48 micropillars with and without metal apertures. Actual resonance fluorescence experiments on single quantum dots coupled to the cavity mode prove the relevance of the proposed approach and demonstrate that it will foster further studies on cavity quantum electrodynamics phenomena under coherent optical excitation. PACS: 78.67.Hc (optical properties of QDs), 42.50.Ct (light interaction with matter), 87.67.-n (optical properties of low-dimensional structures), 42.50.Pq (cavity quantum electrodynamics), 78.55.Cr

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“…This geometrical limitation leads to the assumption that γ is similar to the free space decay rate γ hom [13]. Under this assumption, the only approach to achieving a high β factor is an enhancement of the decay rate into the CM (Purcell enhancement) compared to homogeneous material [8,[25][26][27]. However, for the wavelength-scale micropillar cavity used here, the geometry is very different from an atom cavity.…”

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confidence: 97%

Charged quantum dot micropillar system for deterministic light-matter interactions

et al. 2016

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Quantum dots (QDs) are semiconductor nanostructures in which a three-dimensional potential trap produces an electronic quantum confinement, thus mimicking the behavior of single atomic dipole-like transitions. However, unlike atoms, QDs can be incorporated into solid-state photonic devices such as cavities or waveguides that enhance the light-matter interaction. A near unit efficiency light-matter interaction is essential for deterministic, scalable quantum-information (QI) devices. In this limit, a single photon input into the device will undergo a large rotation of the polarization of the light field due to the strong interaction with the QD. In this paper we measure a macroscopic (∼6• ) phase shift of light as a result of the interaction with a negatively charged QD coupled to a low-quality-factor (Q ∼ 290) pillar microcavity. This unexpectedly large rotation angle demonstrates that this simple low-Q-factor design would enable near-deterministic light-matter interactions. DOI: 10.1103/PhysRevB.93.241409 The deterministic, lossless exchange of energy between charged QDs and single photons has been shown as the potential building block for a full range of components required for QI and quantum communication [1][2][3]. A deterministic light-matter interaction would give one the ability to both switch the photon state with a high fidelity as well as keep photon loss near zero (high efficiency). To achieve these simultaneously, it is essential that all the photon energy that couples to and from the quantum emitter must do so almost exclusively within a well-defined electromagnetic mode, where one can input/collect single photons. Input/output coupling efficiency is parametrized by the β factor, the ratio between the rate of coupling of the dipole to this well-defined mode compared to the total coupling rate of the dipole to all available electromagnetic modes, including leaky ones.Great success has been had in approaching this limit in several systems, including photonic crystal (PC) waveguides [4] and photonic nanowires [5]. For optical cavities, however, this limit has proven difficult to approach. Light-matter interaction strengths in the "strong coupling" regime have been achieved for high-Q-factor pillar microcavities [6] and in photonic crystal cavities [7], and could show high fidelity switching. However, the input/output mode is usually not well defined in high-Q-factor cavities: the escape rate to and from a well-defined input channel is similar to the escape rate to leaky cavity modes (CMs). These leaky modes arise either from the intrinsic design of the structure or from fabrication imperfections, putting a limit on the efficiency of high-Qfactor microcavities where the escape rate into the input/output mode is slow by design. However, in a low-Q-factor pillar the cavity lifetime is very short. Thus one may easily design a high-β-factor structure with a well-defined input/output mode, a crucial advantage [8].The β factor is directly linked to the competition between the rates of coherent and incohere...

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Correlations between axial and lateral emission of coupled quantum dot–micropillar cavities

Cited by 13 publications

References 49 publications

Controlling the gain contribution of background emitters in few-quantum-dot microlasers

Controlling the gain contribution of background emitters in few-quantum-dot microlasers

Efficient stray-light suppression for resonance fluorescence in quantum dot micropillars using self-aligned metal apertures

Charged quantum dot micropillar system for deterministic light-matter interactions

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