Abstract
The characteristics of the small group velocity ${\ensuremath{\nu}}_{g}$ were experimentally studied with special concern to a flat band in AlGaAs-based two-dimensional photonic crystal slabs by using a time-of-flight method of a 200 fs light pulse. Two kinds of triangular air-rod samples, i.e., a deeply perforated waveguide and a perforated membrane suspended in air were used. For the former with the numbers of rod's row N of 10, ${\ensuremath{\nu}}_{g}$ was found to vary from $0.17\ifmmode\times\else\texttimes\fi{}c$ at a wavelength far from the band edge to $0.03\ifmmode\times\else\texttimes\fi{}c$ at the edge; c is the light velocity in vacuum. For the latter with N of 26, ${\ensuremath{\nu}}_{g}$ was observed to be in a range of $(0.05--0.07)\ifmmode\times\else\texttimes\fi{}c.$ The significance of the result is discussed.
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