Article

# Whispering gallery mode microsphere resonator integrated inside a microstructured optical fiber

(Impact Factor: 3.18). 04/2013; 38(8):1301-3. DOI: 10.1364/OL.38.001301
Source: PubMed

ABSTRACT A compact and robust scheme for broadband excitation of whispering gallery mode (WGM) resonances into a microsphere is demonstrated. A polymer microsphere (10 μm) is encapsulated into the capillary of a microstructured optical fiber, in direct contact with the guiding core. Such a configuration allows efficient and reproducible excitation of the in-MOF-microsphere resonator that is characterized by two launch/collection schemes: core input/scattering output, and sphere input/core output. The latter allows an excitation of the microsphere WGMs externally to the fiber. Numerically calculated WGM spectra are in agreement with experiments. Q factors in the range of 103 are typically measured.

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ABSTRACT: A novel, integrated photonic device has been demonstrated, which combines a microstructured optical fiber (MOF) and a Whispering-Gallery Mode (WGM) microsphere resonator encapsulated inside one of its capillaries. Studies have been focused on the light coupling to and from the micro-resonator, as well as, the resonating properties of such a photonic system. Spectral resonation in a spectral band spanning between 500 nm - 1600 nm has been observed, with Q-factors exceeding 2x103 for a single microsphere. Research on the functionality and performance of different fiber/microsphere combinations focuses on the material and size of the microspheres as key parameters for the optimization of the corresponding spectral patterns and Q-factors. This newly developed resonating system constitutes an optical platform with various potential applications.
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