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Energy-selective optical excitation and detection in InAs/InP quantum dot ensembles using a one-dimensional optical microcavity
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) QD photoluminescence as a function of detection angle relative to the sample normal. The rapid decay of the PL emission strength is due to the reduced spontaneous emission rate for large angles in a 1D λ microcavity. 30 Inset: Schematic diagram of the sample structure. (b) PL emission with resolved polarization modes at a detection angle of 50°. (c) Angle-resolved peak cavity transmission (curves) and PL (symbols) with TE (triangles) and TM (squares) mode dispersion. (d) Schematic diagram of the differential transmission experimental apparatus. A polarizing beam splitter cube (PC) and quarter-wave plate (QWP) change the pump beam polarization from TM to TE. Another PC is placed before the monochromator to block the pump beam and transmit the TM polarized probe.

Image of FIG. 2.
FIG. 2.

(a) Results of spectrally resolved collinear differential transmission experiments at normal incidence, showing versus probe detection wavelength and probe pulse delay. Overlay: (dashed curve); at a probe pulse delay of 10 ps (solid curve). The average power in the pump beam is 7 mW, corresponding to a pulse fluence of 400 J/cm−2. Power-dependent experiments (data not shown) indicate that is proportional to the average pump beam power, verifying that the experiments are carried out within the regime. (b) Differential transmission signal at normal incidence, averaged over the linewidth of the microcavity mode. (c), (d) Same as (a), but with incident angles of 4° and 12°. The absolute magnitude of the differential transmission response for different incident angles reflects conditions of equal absorbed power taking into account measured variations of transmissivity and reflectivity with incident angle.

Image of FIG. 3.
FIG. 3.

(a) Results of pump probe differential transmission experiments in the non-collinear excitation geometry. The contour scale and line plots are the same as in Fig. 2 . (b) at 10 ps for the collinear (Fig. 2(d) ) and non-collinear pump probe geometries. In both cases, the probe beam is incident at 12°.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy-selective optical excitation and detection in InAs/InP quantum dot ensembles using a one-dimensional optical microcavity