The use of one or more gold nanoballs as reference objects for FourierTransform holography (FTH) is analysed using experimental soft X-raydiffraction from objects consisting of separated clusters of these balls. Theholograms are deconvoluted against ball reference objects to invert to images,in combination with a Wiener filter to control noise. A resolution of ~30nm,smaller than one ball, is obtained even if a large cluster of balls is used asthe reference, giving the best resolution yet obtained by X-ray FTH. Methods ofdealing with missing data due to a beamstop are discussed. Practical preparedobjects which satisfy the FTH condition are suggested, and methods of formingthem described.
展开▼