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Dynamic axial mode tuning in a rolled-up optical microcavity
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Optical image of a rolled-up optical microcavity from a U-shape pattern. (b) Magnified illustration of the lobe structure that results in the axial confinement. (c) PL spectrum at the middle of the lobe. The black points are experimentally collected data, the solid colored lines are Lorentzian fitted spectra of the individual modes, and the inverted triangles correspond to theoretical energies using the axial confinement model. (d) Calculated axial potential (black line) and the first five axial fields (color lines) corresponding to the lobe structure in (a).

Image of FIG. 2.
FIG. 2.

(a) Schematic of the lateral probing process. The electric field plotted corresponds to m = 45 azimuthal and fundamental axial mode. (b) Measured details of the m = 45 azimuthal mode with and without the probe at two lateral positions separated by 600 nm. (c) Calculated axial confinement profile, showing the first five axial modes as a function of lateral position, z. The predicted alternating overlap of the mode energies with the probe is confirmed in our measurement. (d) Predicted axial mode shift as a function of lateral position. Dashed lines indicate the predicted mode position in the absence of the probe. Solid lines indicate the calculated mode position in the presence of the probe. Solid squares are the experimental peak positions for the data shown in (b).

Image of FIG. 3.
FIG. 3.

(a) Schematic of the method used to vary the overlapping volume between the probe and evanescent field. As the probe moves tangentially to the microcavity over a distance D, the probe diameter increases. (b) PL intensity maps for the m = 45 (left) and m = 53 (right) modes as a function of probe distance D highlight the broad range of tuning that is possible. (c) The full range of peaks from m = 45 to m = 53 at a distance of 0 μm and 6 μm. (d) A comparison of predicted peak positions and energy shifts with measurements. The small deviation at larger values of m could be due to the energy dependence of the refractive index or small defects in the structure.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic axial mode tuning in a rolled-up optical microcavity