Dense arrays of ordered pyramidal quantum dots with narrow linewidth photoluminescence spectra

Surrente, Alessandro; Gallo, Pascal; Felici, Marco; Dwir, B.; Rudra, A.; Kapon, E.

doi:10.1088/0957-4484/20/41/415205

Cited by 26 publications

(16 citation statements)

References 34 publications

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“…To better control the coupling behavior and the gain contribution of a single resonant emitter, integrating a single self-assembled QD into a high-quality microcavity will be interesting in further optimizations. However, this integration is a complicated task that requires sophisticated techniques, such as site-controlled growth [11][12][13][14][15] or in situ lithography [16][17][18]. Deterministically-positioned QDs have been successfully applied in the past to realize high-quality single-photon sources [19,20], but up until now have not been demonstrated to provide sufficient optical gain to reach the lasing threshold in a single-QD device.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…The membrane wafer consisted of a 1 μm thick sacrificial AlGaAs layer (Al content ~0.7) overgrown with a 265 nm thick GaAs membrane layer, on which triangular arrays of inverted pyramids with 400 nm pitch and 300 nm side length were fabricated using electron beam lithography (EBL) and wet chemical etching 36 . The grown heterostructure consisted of a 4.3 nm thick GaAs buffer layer followed by a 0.2 nm thick layer of In 0.2 Ga 0.8 As resulting in the formation of a single symmetric 37, 38 QD at the apex of each pyramidal pit.…”

Section: Methodsmentioning

confidence: 99%

Deterministic radiative coupling of two semiconductor quantum dots to the optical mode of a photonic crystal nanocavity

Calic

Jarlov

Gallo

et al. 2017

Sci Rep

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A system of two site-controlled semiconductor quantum dots (QDs) is deterministically integrated with a photonic crystal membrane nano-cavity. The two QDs are identified via their reproducible emission spectral features, and their coupling to the fundamental cavity mode is established by emission co-polarization and cavity feeding features. A theoretical model accounting for phonon interaction and pure dephasing reproduces the observed results and permits extraction of the light-matter coupling constant for this system. The demonstrated approach offers a platform for scaling up the integration of QD systems and nano-photonic elements for integrated quantum photonics applications.

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“…In that case, pyramid size and distance are in the sub-100nm range, which requires careful attention to surface preparation and growth rate adjustments. Pyramidal QDs with pitch down to 150nm exhibiting good optical properties were prepared using electron beam lithography for the substrate-patterning step [7].…”

Section: Fabrication and Structure Of V-groove Qwrs And Pyramidal Qdsmentioning

confidence: 99%

Deterministic quantum photonics with ordered systems of quantum wires and quantum dots

Kapon

2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

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We describe an approach for preparing systems of semiconductor quantum wires (QWRs) or quantum dots (QDs) with perfect site control combined with good spectral control and high optical emission efficiency, for applications in deterministic quantum photonics. The approach is based on organometallic vapour phase epitaxy on patterned, nonplanar substrates, through which the QWRs/QDs are self-formed in V-groove channels or pyramidal pits. Excellent uniformity (inhomogeneous broadening as low as ~1 meV), tailored heterostructure potential, efficient emission of single and entangled photons, and integrability with photonic crystal (PhC) cavities are demonstrated. Applications in QWR-PhC nanolasers and coupling of a measurable number of QDs with PhC nanocavity modes are implemented and discussed.

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Dense arrays of ordered pyramidal quantum dots with narrow linewidth photoluminescence spectra

Cited by 26 publications

References 34 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

Deterministic radiative coupling of two semiconductor quantum dots to the optical mode of a photonic crystal nanocavity

Deterministic quantum photonics with ordered systems of quantum wires and quantum dots

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