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Octagonal silica toroidal microcavity for controlled optical coupling
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View: Figures


Image of FIG. 1.
FIG. 1.

Process for fabricating a toroidal microcavity.

Image of FIG. 2.
FIG. 2.

(a) Optical microscopic images of a disk cavity to form an octagonal silicon post. (b) Optical microscope image of a disk cavity when KOH etching is performed for 4 h 30 min. and without isotropic etching. (c) Scanning electron microscope image of a fabricated octagonal toroidal microcavity after the laser reflow.

Image of FIG. 3.
FIG. 3.

(a) Structure and dimensions of the octagonal toroidal microcavity used for the calculation. The cavity radius r is 50 μm, and the cavity rim width w is 10 μm. The vertex curvature and the side length of the polygon are r p = 38.1 μm and s = 10 μm, respectively. The effective refractive index of the SiO2 at the rim is n 1 = 1.44 and that of the remaining part is n 2 = 1.3 assuming a 1 μm thick slab. (b) The resonance spectrum of the octagonal silica toroidal microcavity shown in (a). (c) H z-field profile of an octagonal toroidal microcavity. The inset shows a close-up of the mode profile at the corner and the side of the octagon.

Image of FIG. 4.
FIG. 4.

(a) Calculated mode profiles for an octagonal toroidal microcavity (shown in Fig. 3(a)) with a tapered fiber differently touched to the surface. The diameter of the tapered fiber is 1 μm. The refractive index of the fiber is 1.3 assuming a 1 μm thick fiber. (b) Coupling coefficient κ with respect to d for a circular cavity with r = 20 μm and for an octagonal cavity with two different coupling configurations. Square, round, and triangular dots show κ for a circular cavity, parallel coupling ((a) left) and corner coupling ((a) right), respectively.


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Scitation: Octagonal silica toroidal microcavity for controlled optical coupling