A comparison between experiment and theory on few-quantum-dot nanolasing in a photonic-crystal cavity

J. Liu; S. Ates; M- Lorke; J. Mørk; Peter Lodahl; Søren Stobbe

doi:10.1364/OE.21.028507

A comparison between experiment and theory on few-quantum-dot nanolasing in a photonic-crystal cavity

J. Liu, S. Ates, M- Lorke, J. Mørk, Peter Lodahl, Søren Stobbe

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6 Citationer (Scopus)

Abstract

We present an experimental and theoretical study on the gain mechanism in a photonic-crystal-cavity nanolaser with embedded quantum dots. From time-resolved measurements at low excitation power we find that four excitons are coupled to the cavity. At high excitation power we observe a smooth low-threshold transition from spontaneous emission to lasing. Before lasing emission sets in, however, the excitons are observed to saturate, and the gain required for lasing originates rather from multiexcitonic transitions, which give rise to a broad emission background. We compare the experiment to a model of quantum-dot microcavity lasers and find that the number of excitons that must be included to fit the data largely exceeds the measured number, which shows that transitions involving the wetting layer can provide a surprisingly large contribution to the gain.

Originalsprog	Engelsk
Tidsskrift	Optics Express
Vol/bind	21
Udgave nummer	23
Sider (fra-til)	28507-28512
ISSN	1094-4087
DOI	https://doi.org/10.1364/OE.21.028507
Status	Udgivet - 18 nov. 2013

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10.1364/OE.21.028507

http://dx.doi.org/10.1364/OE.21.028507

Citationsformater

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T1 - A comparison between experiment and theory on few-quantum-dot nanolasing in a photonic-crystal cavity

AU - Liu, J.

AU - Ates, S.

AU - Lorke, M-

AU - Mørk, J.

AU - Lodahl, Peter

AU - Stobbe, Søren

PY - 2013/11/18

Y1 - 2013/11/18

N2 - We present an experimental and theoretical study on the gain mechanism in a photonic-crystal-cavity nanolaser with embedded quantum dots. From time-resolved measurements at low excitation power we find that four excitons are coupled to the cavity. At high excitation power we observe a smooth low-threshold transition from spontaneous emission to lasing. Before lasing emission sets in, however, the excitons are observed to saturate, and the gain required for lasing originates rather from multiexcitonic transitions, which give rise to a broad emission background. We compare the experiment to a model of quantum-dot microcavity lasers and find that the number of excitons that must be included to fit the data largely exceeds the measured number, which shows that transitions involving the wetting layer can provide a surprisingly large contribution to the gain.

AB - We present an experimental and theoretical study on the gain mechanism in a photonic-crystal-cavity nanolaser with embedded quantum dots. From time-resolved measurements at low excitation power we find that four excitons are coupled to the cavity. At high excitation power we observe a smooth low-threshold transition from spontaneous emission to lasing. Before lasing emission sets in, however, the excitons are observed to saturate, and the gain required for lasing originates rather from multiexcitonic transitions, which give rise to a broad emission background. We compare the experiment to a model of quantum-dot microcavity lasers and find that the number of excitons that must be included to fit the data largely exceeds the measured number, which shows that transitions involving the wetting layer can provide a surprisingly large contribution to the gain.

U2 - 10.1364/OE.21.028507

DO - 10.1364/OE.21.028507

M3 - Journal article

SN - 1094-4087

VL - 21

SP - 28507

EP - 28512

JO - Optics Express

JF - Optics Express

IS - 23

ER -

A comparison between experiment and theory on few-quantum-dot nanolasing in a photonic-crystal cavity

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