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100 1 _ |a Parfeniukas, Karolis
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245 _ _ |a Improved tungsten nanofabrication for hard X-ray zone plates
260 _ _ |a [S.l.]
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520 _ _ |a We present an improved nanofabrication method of high aspect ratio tungsten structures for use in high efficiency nanofocusing hard X-ray zone plates. A ZEP 7000 electron beam resist layer used for patterning is cured by a second, much larger electron dose after development. The curing step improves pattern transfer fidelity into a chromium hard mask by reactive ion etching using Cl2/O2 chemistry. The pattern can then be transferred into an underlying tungsten layer by another reactive ion etching step using SF6/O2. A 630 nm-thick tungsten zone plate with smallest line width of 30 nm was fabricated using this method and characterized. At 8.2 keV photon energy the device showed an efficiency of 2.2% with a focal spot size at the diffraction limit, measured at Diamond Light Source I-13-1 beamline.
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700 1 _ |a Rahomäki, Jussi
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700 1 _ |a Giakoumidis, Stylianos
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700 1 _ |a Schroer, Christian
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700 1 _ |a Vogt, Ulrich
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773 _ _ |a 10.1016/j.mee.2015.12.015
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