Probing the dispersive and spatial properties of photonic crystal waveguides via highly efficient coupling from fiber tapers

Barclay, P.E.; Srinivasan, K.; Borselli, M.; Painter, O.
July 2004
Applied Physics Letters;7/5/2004, Vol. 85 Issue 1, p4
Academic Journal
The demonstration of an optical fiber based probe for efficiently exciting the waveguide modes of high-index contrast planar photonic crystal (PC) slabs is presented. Fiber taper waveguides formed from standard silica single-mode optical fibers are used to evanescently couple light into the guided modes of a patterned silicon membrane. A coupling efficiency of ∼95% is obtained between the fiber taper and a PC waveguide mode suitably designed for integration with a previously studied ultrasmall mode volume high-Q PC resonant cavity [ Srinivasan et al., Appl. Phys. Lett. 83, 1915 (2003) ]. The micron-scale lateral extent and dispersion of the fiber taper is used as a near-field spatial and spectral probe to study the profile and dispersion of PC waveguide modes.


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