TVA defines a 'topological void' in a dense-sparse embedding space as a triad of concepts satisfying domain cohesion, calibrated marginality, sparse lexical bridging, and geodesic vacancy, yielding 191 reviewable invention candidates from a 140k-document corpus.
Electron energy-loss spectroscopy on freestanding perforated gold films
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abstract
We report on a combined far- and near-field study of surface plasmon polaritons on freestanding perforated gold films. The samples are fabricated by focused ion beam milling of {a periodic hole array into} a carbon membrane followed by thermal evaporation of gold and plasma ashing of the carbon film. Optical transmission spectra show a series of characteristic features, which can be attributed to the excitation of surface plasmon modes via the periodic nanohole array. The corresponding near-field distributions are mapped by electron energy-loss spectroscopy. Besides the optically bright surface plasmon modes, we observe in the near-field an additional dark plasmon mode, which is absent in the normal incidence far-field spectra. Our experimental results are in good agreement with numerical computations based on a discontinuous Galerkin time-domain method.
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Topological Void Analysis A Mathematical Framework for Systematic Technical Innovation Discovery in Knowledge Spaces
TVA defines a 'topological void' in a dense-sparse embedding space as a triad of concepts satisfying domain cohesion, calibrated marginality, sparse lexical bridging, and geodesic vacancy, yielding 191 reviewable invention candidates from a 140k-document corpus.