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Free-standing aluminium foils with 100-nm, randomly distributed through holes have been developed to study optical near-field phenomena on biomaterials. We used polycarbonate Isopore™ membrane filters with 0.1-m pores of perfect spherical cross-section as a substrate for an aluminium coating that later became the foil. The coated filter sheet was glued to a copper grid and the polycarbonate filter dissolved away. With a thickness of about 40 nm, the membranes blocked the light entirely aside from the light transmitted across the holes. The foils allow basic parameters of an envisaged optical near-field set-up to be investigated and optimized in a cost-effective, straightforward manner, using conventional far-field optics.
Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.