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Optically diffractive line gratings with 0.58-m feature sizes have been generated in 100-m perfluorocyclobutane (PFCB) polymer films by direct micromolding using only a silicon master. Strong reflectivities from the green to red portions of the visible spectrum, depending on incident beam angle, were observed with 3 dB bandwidths of approximately 30 nm. This "negative mold-free" technique permits, for the first time to our knowledge, feature reproduction at submicrometer size scales, eliminatesdoi:10.1109/68.896337 fatcat:3zcmclxnpnct3aoix2lgmkqi6i