(Color online) Generic scheme of structures.
TEM pictures of samples A, B, and C (from the top to the bottom), cross-section view (left), and plane view (right).
(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.
(Color online) General schematics of the carrier excitation and relaxation channels in our QD model.
(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.
Decay-time temperature dependence for raw (squares) and hydrogenated (cross) sample B (bottom) and C (top) obtained from time-resolved photoluminescence.
(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.
(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.
(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).
(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.
(Color online) Transmission spectrum.
(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.
Parameters of the QD structures.
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