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Lithographically Fabricated Optical Antennas with Gaps Well Below 10 nm



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Pairs of nanoparticles separated by a controllable gap size that can be as small as 3 nm are fabricated via a top-down lithographic procedure. This fabrication method would be useful not only for surface-enhanced Raman scattering, where it could potentially enable single-molecule sensitivity, but also for other applications in plasmonics and nonlinear optics.