A few-emitter solid-state multi-exciton laser

Lichtmannecker, S.; Florian, Matthias; Reichert, T.; Blauth, M.; Bichler, Max; Jahnke, F.; Finley, Jonathan J.; Gies, Christopher; Kaniber, M.

doi:10.1038/s41598-017-07097-9

Cited by 11 publications

(16 citation statements)

References 32 publications

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“…The value of this effective β-factor β eff implicitly depends on the excitation rates of resonant and BG emitters and can, thereby, be tuned as we discuss in the following section. Note that more intricate many-body effects can already lead to deviations from a constant β-factor of the resonant and BG QDs (b BG and b QD ), a more detailed study of which is beyond the scope of the present work [42,43].…”

Section: Microscopic Laser Model For Resonant Qd and Bg Emittersmentioning

confidence: 97%

“…Small remaining energy differences on the meV scale are efficiently bridged predominantly by Augerassisted scattering of carriers in the QD states with carriers in WL states that are occupied at sufficiently strong excitation at which QD emission saturates. This combination has been demonstrated to form an emission background that is resonant with the mode [26,28,43]. In this context, a better understanding of the influence of individual in-and off-resonant QDs on the lasing behavior is needed and will be crucial for the design and operation of future micro-and nano-lasers.…”

Section: Introductionmentioning

confidence: 99%

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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: Microscopic Laser Model For Resonant Qd and Bg Emittersmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…To do so, all given values of β are evaluated at P = P th . While nonconstant β factors have been investigated in different contexts [21][22][23], this approximate treatment fully serves the purpose in this work. For β approaching unity, the intensity jump goes to zero, reflecting the concept of thresholdless lasing often referred to in the literature [12][13][14].…”

Section: Characterizing the Laser Threshold Beyond The Rate-equatmentioning

confidence: 99%

Section: Characterizing the Laser Threshold Beyond The Rate-equation ...mentioning

confidence: 99%

Delayed Transition to Coherent Emission in Nanolasers with Extended Gain Media

et al. 2018

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The realization of high-β lasers is one of the prime applications of cavity-QED promising ultra-low thresholds, integrability and reduced power consumption in the field of green photonics. In such nanolasers spontaneous emission can play a central role even above the threshold. By going beyond rate-equation approaches, we revisit the definition of a laser threshold in terms of the input-output characteristics and the degree of coherence of the emission. We demonstrate that there are new regimes of cavity-QED lasing, realized e.g. in high-Q nanolasers with extended gain material, for which the two can differ significantly such that coherence is reached at much higher pump powers than required to observe the thresholdlike intensity jump. Against the common perception, such devices do not benefit from high-β factors in terms of power reduction, as a significant amount of stimulated emission is required to quieten the spontaneous emission noise. arXiv:1809.08976v2 [cond-mat.mes-hall]

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“…Figure 2(a) illustrates how the center of the inhomogeneous ensemble is strongly detuned at low temperatures (black). Feeding into the cavity mode is provided by only a few resonant emitters and is likely aided by off-resonant coupling of detuned background emitters through a quasicontinuum of excitonic transitions due to the complex multi-exciton level structure in the QDs [12][13][14]. At room temperature, a strong overlap of the emitter ensemble with the cavity mode is observed (red) and, from the theory, we estimate that ∼240 emitting dipoles efficiently couple to the laser mode.…”

Section: A Sample Characterization and Temperature Tuning Of The Emimentioning

confidence: 89%

Delayed formation of coherence in the emission dynamics of high-Q nanolasers

Segnon¹,

Sagnes²,

Braive³

et al. 2018

Optica

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In the realization of ultrasmall semiconductor lasers, cavity-QED effects are used to enhance spontaneous emission and enable the lasing threshold to be crossed with gain contributions from only a few solid-state emitters. Operation in this regime fosters correlation effects that leave their fingerprint especially in the emission dynamics of nanolasers. Using time-resolved photon-correlation spectroscopy, we show that in a quantum-dot photonic-crystal nanolaser emitting in the telecom band, second-order coherence associated with lasing is established on a different timescale than the emission itself. By combining measurements with a microscopic semiconductor laser theory, we attribute the origin to carrier-photon correlations that give rise to non-Markovian effects in the emission dynamics that are not captured by laser rate-equation theories. Our results have direct implications with respect to the modulation response, repetition rate, noise characteristics, and coherence properties of nanolasers for device applications.

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A few-emitter solid-state multi-exciton laser

Cited by 11 publications

References 32 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

Delayed Transition to Coherent Emission in Nanolasers with Extended Gain Media

Delayed formation of coherence in the emission dynamics of high-Q nanolasers

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