High Q (33 000) all-epitaxial microcavity for quantum dot vertical-cavity surface-emitting lasers and quantum light sources

Müller, Andreas; Shih, Chih Kang; Ahn, J.; Lu, Donghua; Gazula, D.; Deppe, D.G.

doi:10.1063/1.2158519

Cited by 20 publications

(15 citation statements)

References 10 publications

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“…Here, spontaneously emitted photons are coupled efficiently into the lasing mode of high-Q microcavities leading to low threshold powers. 12 In this letter, we report on lasing of small numbers of QDs in micropillar cavity structures with Q factors of up to 23.000. In the limit of ␤ → 1 even thresholdless lasing is predicted to occur.…”

mentioning

confidence: 98%

Lasing in high-Q quantum-dot micropillar cavities

Reitzenstein

Bazhenov

Gorbunov

et al. 2006

Applied Physics Letters

100

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mentioning

confidence: 98%

Lasing in high-Q quantum-dot micropillar cavities

Reitzenstein

Bazhenov

Gorbunov

et al. 2006

Applied Physics Letters

100

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“…Several works 3-12 analyzed the influence of microcavity structuring (in shape and size) on the quality factor Q. Rather complicated spatial and spectral structures of confined modes were discovered experimentally [13][14][15][16] and analysed theoretically 17 in GaAs-and CdTe-based as well as in organic microcavity pillars. 18,19 The general conclusion of these works is that a lateral decrease of the microcavity size to ∼ 5 µm substantially improves the quality factor from ∼10 3 to ∼10 6 .…”

Section: Introductionmentioning

confidence: 98%

Sub-nanojule threshold lasing in 5×5 μm²organic photonic boxes

et al. 2008

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The lasing threshold of a microcavity is mainly determined by the spontaneous emission factor β, which is inversely proportional to the mode volume V c . We demonstrate an experimental way to decrease the mode volume via lateral structuring of the microcavity. This redistributes both number and density of the transversal cavity modes, which increases the amplitude of the internal electromagnetic field. Our samples are microcavities with an active layer of variable thickness (0.2 to 2 µm) made of tris-(8-hydroxyquinoline) aluminium (Alq 3 ) doped with 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM). With thermal coevaporation through a shadow mask, this layer is structured into an array of photonic boxes square-shaped microcavities with an area of 5 ×5 µm 2 . Using a microscope objective, we record the spatial distribution of the cavity transmission spectra with submicron resolution. The modes of the photonic boxes show a clear discretization, which is due to the multidimensional optical confinement. Under selective excitation of the DCM molecules via a focused pulsed laser (532 nm, 1.5 ns, 2 kHz , ≈ 3 µm), we record the spatially and spectrally resolved emission of single photonic boxes. The laser pulse energy is varied to obtain input-output curves of the cavity modes. At an excitation energy of ∼ 30 pJ, we observe superlinear growth as well as a spectral narrowing of the emission from the lowest energy mode of a single photonic box. For this lasing transition, we determine a spontaneous emission factor β of ≈ 0.01.

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“…12,13 Since organic materials suffer from low charge carrier mobilities, the currently obtained threshold values have to be reduced. A promising approach is the three-dimensional confinement that has been demonstrated in inorganic semiconductors by micropillars 14,15 and mode mapping of photonic dots 16 as well as organic photonic dots. 17 In this paper, we demonstrate the existence of a minimum for the threshold value in dependence on the thickness of the active layer.…”

Section: Introductionmentioning

confidence: 99%

Lower limit of the lasing threshold in an organic microcavity

et al. 2008

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The application of organic materials as solid state lasers critically relies on a low lasing threshold. We investigate the characteristics of emission from an organic vertical cavity surface emitting laser. The microcavity studied here consists of two highly reflective distributed Bragg reflectors enclosing a wedge-shaped active layer of Alq 3 :DCM. Lasing of the DCM molecules is induced via two different pump regimes, either exciting Alq 3 at a wavelength of 400 nm or pumping directly into the absorption band of DCM at 532 nm. By a variation of the pump beam position with respect to the microcavity surface, we demonstrate a continuous wavelength tuning in the organic microcavities in a range of 55 nm. The continuously variable cavity thickness allows us to study the thickness dependence of the input-output characteristics in a single sample. These data are obtained at a certain emission wavelength, λ, close to the maximum of the gain spectrum, for a number of cavity thicknesses, which correspond to different multiples of λ/2. For a decreasing thickness of the active layer, one-dimensional optical confinement is expected to result in an increased spontaneous emission factor. On the other hand, the loss rate through the mirrors increases with decreasing thickness resulting in a minimum threshold value for an active layer thickness of approximately 3/2 λ. This lower threshold limit is set by nonradiative losses as well as residual absorption.

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High Q (33 000) all-epitaxial microcavity for quantum dot vertical-cavity surface-emitting lasers and quantum light sources

Cited by 20 publications

References 10 publications

Lasing in high-Q quantum-dot micropillar cavities

Lasing in high-Q quantum-dot micropillar cavities

Sub-nanojule threshold lasing in 5×5 μm²organic photonic boxes

Lower limit of the lasing threshold in an organic microcavity

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High Q (33 000) all-epitaxial microcavity for quantum dot vertical-cavity surface-emitting lasers and quantum light sources

Cited by 20 publications

References 10 publications

Lasing in high-Q quantum-dot micropillar cavities

Lasing in high-Q quantum-dot micropillar cavities

Sub-nanojule threshold lasing in 5×5 μm2organic photonic boxes

Lower limit of the lasing threshold in an organic microcavity

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Sub-nanojule threshold lasing in 5×5 μm²organic photonic boxes