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PL near-field spectra of a single D2 cavity (a) and of a K-aligned photonic molecule (b) measured by a SNOM set up. The relative SEM images are shown in the insets. The resonant mode M1 (M2) of the single cavity reported in (a) gives rise to the slightly (widely) split modes labelled as P1 and P2 (P3 and P4) of the photonic molecule shown in (b). In (c) are reported, in wavelength units, the experimental splittings ΩP1-P2 (blue circles) and ΩP3-P4 (red dots) measured for ten nominally identical K-aligned photonic molecules.
The P3 resonant mode (a) and the experimental splitting ΩP3-P4 (b) are reported as a function of the Ar+ laser exposure time. The exposition is performed through the probe of the SNOM set up kept on the central region of the K-aligned photonic molecule.
FDTD calculations performed in order to simulate the effect of green laser assisted micro-oxidation on an ideal K-aligned photonic molecule, where no disorder induced detuning is present. The P3 mode and the splitting ΩP3-P4 as a function of the effective GaAs slab thickness reduction are reported in (a) and (b), respectively. The P3 mode and the splitting ΩP3-P4 as a function of the diameter increase of the eleven central pores of the photonic molecule are reported in (c) and (d), respectively. The error bars correspond to the spectral resolution of the FDTD calculations.
(a)–(c) Schematic views of the refractive index profile used in FDTD calculations for the same photonic molecule geometry where 1, 7, and 11 central pores, respectively, are simulated as infiltrated with water: grey represents n = 3.48 (GaAs), light blue n = 1.33 (water), and black n = 1 (air). The P3 resonant mode (d) and the splitting ΩP3-P4 (e) obtained by FDTD calculations are reported as a function of the number of the infiltrated pores. The error bars correspond to the spectral resolution of the FDTD calculations.
(a) Schematic view of the three experimental steps performed to measure the increase of the coupling strength. (b) ΩP3-P4 is reported as a function of the exposure time of subsequent lateral micro-evaporation and micro-oxidations, as described in (a). The red dot at negative time corresponds to the initial value before the right-side infiltration. The blue circles represent ΩP3-P4 after the right-side infiltration followed by a right side laser illumination. The black dots represent ΩP3-P4 after the central infiltration followed by a left side laser exposition.
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