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Item record/more information http://hdl.handle.net/10197/3381 Publisher's statement This paper was published in Optics Latters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=ol-35-7-947. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. Publisher'sdoi:10.1364/ol.35.000947 pmid:20364179 fatcat:quduxktravajhkkmmv2xvkzza4