Electrically Driven Quantum Dot Micropillar Light Sources (original) (raw)

Electrically driven quantum dot-micropillar single photon source with 34% overall efficiency

Applied Physics Letters, 2010

We report on triggered single photon emission from low mode volume electrically driven quantum dot-micropillar cavities at repetition rates of up to 220 MHz. Due to an optimized layout of the doped planar microcavity and an advanced lateral current injection scheme, highly efficient single photon sources are realized. While g (2) (0)-values as low as 0.13±0.05 and a Purcell-factor of 4 are observed for a 2.0 µm diameter micropillar, single photon emission at a rate of (35±7) MHz and an overall efficiency of (34±7) % are demonstrated for a 3.0 µm device.

Electrically driven high-Q quantum dot-micropillar cavities

2008

We report on electrically pumped high-Q quantum dot-micropillar cavities with quality factors of up to 16.000. A special current injection scheme using a ring-shaped upper contact is presented which ensures an efficient light out-coupling through the uncapped upper surface of the micropillar. The devices feature excellent single-quantum dot cavity quantum electrodynamic effects with a Purcell enhancement of about 10 for a micropillar with a diameter of 2.5 m.

Quantum dots in micropillar cavities for scalable photonic applications

Frontiers in Optics + Laser Science APS/DLS, 2019

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Low threshold electrically pumped quantum dot-micropillar lasers

Applied Physics Letters, 2008

We report on low threshold lasing in electrically pumped quantum dot-micropillar cavities. Lasing action associated with threshold currents as low as 8 µA at 10 K is observed for micropillar cavities with quality factors exceeding 10.000. Due to an optimized contact scheme lasing is achieved for pillar structures with diameters as small as 1.5 µm, containing on average less than 100 quantum dots in the active layer.

On-chip light detection using monolithically integrated quantum dot micropillars

Applied Physics Letters, 2016

We demonstrate the on-chip detection of light using photosensitive detectors based on quantum dot (QD) micropillar cavities. These microscale detectors are applied exemplarily to probe the emission of a monolithically integrated, electrically pumped whispering gallery mode microlaser. Light is detected via the photocurrent induced in the electrically contacted micropillar detectors under reverse-bias. In order to demonstrate the high potential and applicability of the microdetector presented, we determine the threshold current of an integrated microlaser to be (54 ± 4) μA, in very good agreement with the value of (53 ± 4) μA inferred from optical data. Within this work we realize the monolithic integration of a laser and a detector in a single device operating in the regime of cavity-quantum electrodynamics. Our results thus advance the research on microscale sensor technology towards the few-photon quantum limit and pave the way for on-chip opto-electronic feedback experiments.

Microcavity enhanced single photon emission from an electrically driven site-controlled quantum dot

Applied Physics Letters, 2012

In this work we report on the integration of single site-controlled quantum dots (SCQDs) into electrically driven micropillar cavities. The electroluminescence of these devices features emission of single SCQDs with inhomogeneous broadenings down to 170 µeV. The enhancement of electroluminescence by quantum dot-cavity coupling is demonstrated by temperature dependent investigations. Single photon emission from a spatially and spectrally coupled SCQD-resonator system is confirmed by photon autocorrelation measurements under electrical excitation yielding a g (2) (0) value of 0.42. C. Schneider et al., page 2

Cavity QED with quantum dots in semiconductor microcavities

Quantum Dots, Particles, and Nanoclusters IV, 2007

Cavity quantum electrodynamic (QED) effects are studied in semiconductor microcavities embedded with InGaAs quantum dots. Evidence of weak coupling in the form of lifetime enhancement (the Purcell effect) and inhibition is found in both oxide-apertured micropillars and photonic crystals. In addition, high-efficiency, low-threshold lasing is observed in the photonic crystal cavities where only 2-4 quantum dots exist within the cavity mode volume and are not in general spectrally resonant. The transition to lasing in these soft turn-on devices is explored in a series of nanocavities by observing the change in photon statistics of the cavity mode with increasing pump power near the threshold.

Single photon emission from a site-controlled quantum dot-micropillar cavity system

Applied Physics Letters, 2009

We demonstrate the deterministic integration of single site-controlled quantum dots (SCQDs) into micropillar cavities. Spatial resonance between single positioned quantum dots (QDs) and GaAs/AlAs micropillar cavities was achieved using cross markers for precise SCQDcavity alignment. Cavity effects are clearly reflected in an enhanced photoluminescence intensity when tuning SCQD emission lines through the fundamental cavity resonance. Single photon emission from a spatially and spectrally coupled SCQD-resonator system is confirmed by photon autocorrelation measurements yielding a g (2) (0) value of 0.12.

Demonstration of strong coupling via electro-optical tuning in high-quality QD-micropillar systems

Optics …, 2008

We demonstrate electro-optical tuning of single quantum dots (QDs) embedded in high-quality (high-Q) micropillar cavities by exploiting the quantum confined Stark effect (QCSE). Combining electrically contacted high-Q micropillars and large In 0.3 Ga 0.7 As QDs with high oscillator strength facilitates the realization of strong coupling. In our experiments a single QD exciton was electrically tuned on resonance with a cavity mode of a micropillar with 1.9 μm diameter and a quality-factor (Q-factor) of 14,000 enabling the observation of strong coupling with a vacuum Rabi-Splitting of 63 μeV.