(Color online) (a) Optical micrograph of the cross section of a twin-hole optical fiber. (b) Schematic of the experimental setup. (c) Optical micrograph (side view) of the twin-hole optical fiber with photonic crystals grown within the microchannel.
(a) SEM shows a strong physical confinement for microspheres inside the microchannel; (b) SEM of photonic crystals grown around the wall of the microchannel; (c) SEM of the edge of colloidal photonic crystals. The surface is across the fiber; (d) the surface is along the longitudinal direction of the twin-hole fiber.
SEMs of photonic crystals grown inside the twin-hole optical fiber: (a) Cross section of cleaved colloidal photonic crystals. Random microspheres are produced when the crystal is cleaved. Layer-by-layer structures are clearly seen. (b) Dissected photonic crystal surface along the photonic crystal growing direction. (c) High magnification of the (001) surface of a fcc crystal. (d) High magnification of the (111) surface of a fcc crystal.
(Color online) (a) Optical reflection spectrum from the (111) surface of the colloidal photonic crystals, and (b) corresponding band-structure calculations along the  direction .
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