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Schematic of the resonator structure.
(a) Dispersion diagram of effective indices vs frequency of modes supported by the PBG crystal with one rod removed in the center (hollow-core). Gray areas show domains where the cladding array supports modes delimiting the band gap (white area). (Inset) Computed intensity picture of the fundamental mode confined in the hollow-core. Silica rods are delimitated by white circles. (b) Evolutions of the unloaded Q-factor of the hollow-core PBG crystal for different number of rings of rods disposed around the hollow-core.
Transmission spectra measured with a vector network analyzer of a resonator composed of a PBG crystal, (a) without or with a hollow-core in the center of four rings of silica rods and (b) with a hollow-core surrounded by three or four rings of silica rods.
(a) Transmission spectra measured over a wider span with a vector network analyzer of a resonator composed of a PBG crystal of four rings of silica rods with one single silica rod removed in the center. (b) Dispersion diagram of effective indices of modes supported by the resonator deduced from measures as a function of the frequency (dots). Simulated effective index curve of the fundamental mode confined in the hollow-core (solid curve).
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