Strong Purcell effect for InAs quantum boxes in three-dimensional solid-state microcavities

Gerard, Jean‐Michel; Gayral, B.

doi:10.1109/50.802999

Cited by 401 publications

(293 citation statements)

References 40 publications

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“…The brightness of a source, defined by the number of collected photons in the first lens per excitation pulse, is given by the product bZq QD where Z is the mode coupling to the external optical field and q QD the quantum efficiency of the QD emission line. Pillar cavities are obtained by etching a planar cavity made of two distributed Bragg reflectors around a k microcavity 14 . We first note that absorption or scattering in the mirrors are negligible in the GaAs/AlAs system under consideration.…”

Section: Resultsmentioning

confidence: 99%

“…However, because only a few per cent of the emitted photons can be collected for QDs in bulk semiconductors, control of the QD spontaneous emission is needed to obtain bright quantum light sources. One can for instance insert the QD in a cavity to increase the local density of electromagnetic modes and accelerate its spontaneous emission into a given optical mode 14,7,8,10 . Another possibility is to use subwavelength waveguides to inhibit the emission in most directions of space 9,15 .…”

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confidence: 99%

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Bright solid-state sources of indistinguishable single photons

et al. 2013

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Bright sources of indistinguishable single photons are strongly needed for the scalability of quantum information processing. Semiconductor quantum dots are promising systems to build such sources. Several works demonstrated emission of indistinguishable photons while others proposed various approaches to efficiently collect them. Here we combine both properties and report on the fabrication of ultrabright sources of indistinguishable single photons, thanks to deterministic positioning of single quantum dots in well-designed pillar cavities. Brightness as high as 0.79±0.08 collected photon per pulse is demonstrated. The indistinguishability of the photons is investigated as a function of the source brightness and the excitation conditions. We show that a two-laser excitation scheme allows reducing the fluctuations of the quantum dot electrostatic environment under high pumping conditions. With this method, we obtain 82 ± 10% indistinguishability for a brightness as large as 0.65 ± 0.06 collected photon per pulse.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Bright solid-state sources of indistinguishable single photons

et al. 2013

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“…We chose an average excitation power below the destruction threshold of the SRR metamaterial while, at the same time, maximizing the signal-to-noise ratio. In this excitation regime, the QD-PL signal increases sublinearly with excitation power, indicating that we are pumping the QDs well beyond the onset of the saturation regime 60 . Owing to the damage threshold of the gold SRRs, however, we do not quite reach the ideal saturation regime; hence, an increase in excitation power is still connected to a slight increase in PL signal.…”

Section: Methodsmentioning

confidence: 99%

Dual-channel spontaneous emission of quantum dots in magnetic metamaterials

et al. 2013

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Metamaterials, artificial electromagnetic media realized by subwavelength nano-structuring, have become a paradigm for engineering electromagnetic space, allowing for independent control of both electric and magnetic responses of the material. Whereas most metamaterials studied so far are limited to passive structures, the need for active metamaterials is rapidly growing. However, the fundamental question on how the energy of emitters is distributed between both (electric and magnetic) interaction channels of the metamaterial still remains open. Here we study simultaneous spontaneous emission of quantum dots into both of these channels and define the control parameters for tailoring the quantum-dot coupling to metamaterials. By superimposing two orthogonal modes of equal strength at the wavelength of quantum-dot photoluminescence, we demonstrate a sharp difference in their interaction with the magnetic and electric metamaterial modes. Our observations reveal the importance of mode engineering for spontaneous emission control in metamaterials, paving a way towards loss-compensated metamaterials and metamaterial nanolasers.

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“…Few-particle states in optically excited semiconductor quantum dots [1 -3] have recently attracted enormous interest: on the one hand, they exhibit a number of atomic-like properties attributed to their zero-dimensional nature, such as ultranarrow emission peaks [4,5] or ultralong dephasing times [6]; on the other hand, the semiconductor compound gives rise to a number of novel features which lack atomic counterparts, among which multi-excitons [7 -10] and flexible interdot coupling [11,12] are the most prominent ones. Optical excitations in semiconductors quantum dots are composed of electron -hole pairs (excitons), which become profoundly renormalized because of the resulting mutual Coulomb interactions; indeed, such Coulomb-renormalization effects have been studied exhaustively in single-dot spectroscopy [13] and are at the heart of the celebrated quantum-dot-based single-photon sources [14,15]. In addition, advanced growth procedures now allow to vertically couple dots in a well-controlled manner, and to tune the coupling strength within a wide parameter range.…”

Section: Introductionmentioning

confidence: 99%

“…Optical excitations in semiconductors quantum dots are composed of electron -hole pairs (excitons), which become profoundly renormalized because of the resulting mutual Coulomb interactions; indeed, such Coulomb-renormalization effects have been studied exhaustively in single-dot spectroscopy [13] and are at the heart of the celebrated quantum-dot-based single-photon sources [14,15]. In addition, advanced growth procedures now allow to vertically couple dots in a well-controlled manner, and to tune the coupling strength within a wide parameter range.…”

mentioning

confidence: 99%

Four-wave mixing in coupled semiconductor quantum dots

Koskinen

Hohenester

2003

Solid State Communications

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We present a theoretical analysis of four-wave mixing in coupled quantum dots subject to inhomogeneous broadening. For the biexciton transitions, a clear signature of interdot-coupling appears in the spectra. Few-particle states in optically excited semiconductor quantum dots [1 -3] have recently attracted enormous interest: on the one hand, they exhibit a number of atomic-like properties attributed to their zero-dimensional nature, such as ultranarrow emission peaks [4,5] or ultralong dephasing times [6]; on the other hand, the semiconductor compound gives rise to a number of novel features which lack atomic counterparts, among which multi-excitons [7 -10] and flexible interdot coupling [11,12] are the most prominent ones. Optical excitations in semiconductors quantum dots are composed of electron -hole pairs (excitons), which become profoundly renormalized because of the resulting mutual Coulomb interactions; indeed, such Coulomb-renormalization effects have been studied exhaustively in single-dot spectroscopy [13] and are at the heart of the celebrated quantum-dot-based single-photon sources [14,15]. In addition, advanced growth procedures now allow to vertically couple dots in a well-controlled manner, and to tune the coupling strength within a wide parameter range.This flexibility renders quantum dots as ideal candidates for novel (quantum) device applications. Proposals range from cellular automata [16] over storage devices [17,18] to possible registers for quantum computers [19]. Yet, such challenging future technology requires a detailed understanding of interdot couplings and of the resulting fewparticle states-issues which have only recently become subject of careful investigations. One of the crucial difficulties in these studies is the unavoidable inhomogeneous line broadening because of dot size fluctuations, inherent to any self-assembly growth procedure, which hinders the direct observation of interdot-coupling induced level splittings. Although the investigation of single quantum-dot molecules has been demonstrated and has given clear evidence of interdot coupling [11,12], the underlying analysis faces severe problems when the change of interdot coupling is accompanied by possible variations of the lateral confinement-a delicate problem in particular for the technologically highly relevant self-assembled dots.In this paper we present a theoretical analysis of fourwave mixing (FWM) [20] in an ensemble of inhomogeneously broadened coupled quantum dots, and we show that FWM spectra provide a sensitive measure of such pertinent interdot couplings. This finding rests on a number of nontrivial observations. Firstly, FWM is a technique particularly suited for the measurement of transport parameters independent of inhomogeneous broadening, e.g. exciton dephasing or biexciton binding [6,21,22]. Secondly, in the strong confinement regime the electron -hole tunneling 0038-1098/03/$ -see front matter q

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Strong Purcell effect for InAs quantum boxes in three-dimensional solid-state microcavities

Cited by 401 publications

References 40 publications

Bright solid-state sources of indistinguishable single photons

Bright solid-state sources of indistinguishable single photons

Dual-channel spontaneous emission of quantum dots in magnetic metamaterials

Four-wave mixing in coupled semiconductor quantum dots

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