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(Color online) (a) The cross-polarized reflectivity setup used to probe the cavity. The excitation laser is passed through a polarizing beam splitter (PBS) and half-wave plate (HWP) before being focused by an OL onto the sample, which is kept under vacuum at a temperature of 30 K. Light is collected from the sample by the OL and passes through the HWP and PBS again, which select for the opposite polarization; only light emitted by the sample itself and not directly reflected will have a component in this polarization. A long-pass filter (LPF) can be used to eliminate the excitation source if necessary. (b) SEM of the nanobeam photonic crystal. (c) The Ey field profile of the cavity mode of interest, obtained by FDTD simulations.
(Color online) Cavity emission from (a) QD photoluminescence and (b) laser reflectivity. (c) Laser scan showing off-resonant coupling between two quantum dots and the cavity.
(Color online) (a) QD1 emission under cavity excitation and (b) cavity emission under QD1 excitation, both as a function of probe laser wavelength λp . Power series showing saturation of both QD1 emission (c) and cavity emission (d) under the same excitation as in (a) and (b), respectively.
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