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Nanopores in silicon nitride membranes with two thin gold films. (A) Arrays of membranes supported by the wafer imaged from the backside. (B) Example of “larger” nanopores imaged from the topside. (C) Close up showing “smaller” nanopores imaged from the topside. Note that the backside diameter is also visible. (D) Typical extinction spectra in a water environment for larger and smaller diameters. The arrows show the spectral resonance features (peak and dip).
