We have measured the polarization-dependent phase shift imparted to the radiation reflected by a two-dimensional photonic crystal within the band gap spectral region. We show that the relative phase between retroreflected basis polarizations can be large, reaching and exceeding a quarter of a wave in spectral regions of extremely high reflectivity for certain crystals. Using this property, we have directly experimentally demonstrated the operation of a reflective quarter-waveplate. All-dielectric, reflective waveplates could generate new applications involving polarization control.
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