We demonstrate group-index engineering in a one-dimensional periodic silicon structure consisting of a deepetched laterally corrugated waveguide with circular holes patterned onto its wide section. Our theoretical analysis, supported by experimental results, shows that the first-order optical mode can propagate inside the Brillouin zone with a relatively high group index over a wide frequency range. Nearly constant group index as high as 13.5 over a wavelength range of approx14 nm is experimentally demonstrated in a 50-(mu)m-long waveguide.
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