Abstract
Wave plates are important optical components for controlling the polarization state of light, in scientific research as well as commercial applications. Traditional wave plates are not achromatic, and more elaborate designs typically rely on stacking of different wave plates and system optimization to extend the operating bandwidth. Here the authors demonstrate that broadband wave plates can be obtained by engineering the mode dispersion in a single layer of subwavelength gratings featuring high refractive-index contrast. This achievement will contribute to the design of compact, fully integrated polarization converters for practical applications.
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