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(a) Side view of ARROW waveguide structure with liquid core. High-index cladding layers act as Fabry–Perot reflectors for the transverse wave vector . (b) Waveguide loss for fundamental ARROW mode vs core width (solid line) and nonguiding water∕glass capillary (dashed line) . Inset: Front view of ARROW structure with incident polarization.
SEM image of hollow-core ARROW waveguide (core dimensions: 3.5 by ).
(a) Output facet image of mode propagating in liquid core ARROW waveguide. Black lines: Outline of sample for clarity. Inset: Intensity mode profile (near-field). (b) Comparison of observed transverse (squares) and lateral (circles) mode profiles in waveguide center with theoretical prediction (lines).
(a) Circles: Transmitted intensity vs waveguide length . Line: Exponential fit. (b) Waveguide loss vs wavelength. Bars: Experimental values (ethylene glycol core); circles: calculation (ethylene glycol core), dashed line: optimized design (water core) for propagation at and rejection at (arrows).
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