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Abstract
We report a microfluid-guided growth of colloidal photonic crystals inside a twin-hole optical fiber. The microfluid is pumped by the vapor pressure and capillary force of the solvent sealed in a vial. A face-centered-cubic lattice-type structure has been achieved for colloidal photonic crystals grown inside the twin-hole optical fiber. The colloidal crystal growths at air-colloid interfaces, fiber microchannel-colloid interfaces, and crystal-colloid boundaries are studied with scanning electronic microscope. Optical reflection measurement reveals a stop band along the fiber longitudinal direction due to the Bragg diffraction of in-fiber colloidal photonic crystals. The in-fiber photonic crystal adds an optical function to the microstructure optical fiber by incorporating spectral control through a structural resonance in the cladding region of the optical fiber.
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