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1 January 2015, Volume 5, Issue 1, pp. 1-209
The realization of half wave phase retarders based on subwavelength periodic gratings typically requires small periods with large aspect ratio features. This figure shows a cross section of a fabricated sample, with a zoomed view where only the crowns of the grating lines are visible. For details, see T. Paul et al. Opt. Mater. Express 5, 124-129 (2015).