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High density InAlAs/GaAlAs quantum dots for non-linear optics in microcavities
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Image of FIG. 1.
FIG. 1.

(Color online) Generic scheme of structures.

Image of FIG. 2.
FIG. 2.

TEM pictures of samples A, B, and C (from the top to the bottom), cross-section view (left), and plane view (right).

Image of FIG. 3.
FIG. 3.

(Color online) Luminescence spectra for samples A, B, and C (from top to bottom). Left: Room and low temperature. Right: Log of the normalized total PL intensity versus temperature.

Image of FIG. 4.
FIG. 4.

(Color online) General schematics of the carrier excitation and relaxation channels in our QD model.

Image of FIG. 5.
FIG. 5.

(Color online) PL intensity at the QD emission wavelength: experimental data (squares) and simulation with the model developed in this paper (line) as a function of temperature for sample A.

Image of FIG. 6.
FIG. 6.

Decay-time temperature dependence for raw (squares) and hydrogenated (cross) sample B (bottom) and C (top) obtained from time-resolved photoluminescence.

Image of FIG. 7.
FIG. 7.

(Color) 5-layer QD structure embedded in a ridge waveguide formed by the initial stack described in Fig. 1 modified for waveguiding properties. The single mode size calculated with a finite element program (ALCOR) is 3 μm × 0.250 μm.

Image of FIG. 8.
FIG. 8.

(Color) Calculation of the transmission of nonlinear saturating Fabry-Perot resonator. The data used are: R = 0.3, α0 = 14 cm–1, α g  = 10 cm–1, L = 0.23 cm, I s  = 2.8 kW/cm2, n 0 = 4.16, δn s  = 1.75 × 10–3. A confinement factor = 0.12 is applied.

Image of FIG. 9.
FIG. 9.

(Color) Experimental setup: Ti:sapphire laser (Ti-Sa), beam splitter ( BS ), half-wave plate ( HWP ), optical isolator ( OI ), acousto-optic modulator ( AOM ), lenses L1 (f = 10 mm), L2 (f = 10 mm), L3 (f = 35 mm), L4 (f = 50 mm), L5 (f = 35 mm), L6 (f = 35 mm), L7 (f = 35 mm); mirror ( M ), filters (F1, F2), photodiodes ( PD 1, PD 2).

Image of FIG. 10.
FIG. 10.

(Color) Left: plot of the transmission as function of wavelength for different transmitted intensities. Right: transmission as a function of wavelength at constant intracavity intensity around 786.7 nm.

Image of FIG. 11.
FIG. 11.

(Color online) Transmission spectrum.

Image of FIG. 12.
FIG. 12.

(Color online) Left: plot of the transmission as a function of the incident intensity. Right: material absorption vs incident intensity as deduced from Eq. (9); thick line (experimental), thin line (theoretical). The inset displays the same data in the form 1/ = f(P inc ); the linear dependence assesses a saturation law of the absorption.


Generic image for table
Table I.

Parameters of the QD structures.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High density InAlAs/GaAlAs quantum dots for non-linear optics in microcavities