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Horn antenna is one of the simplest even widely used antennas in the RF and microwave regimes. However, few systematic investigations on pyramidal horn antennas are found at optical frequency while optical antennas are extensively studied in various applications. Here, we investigate the feature of pyramidal horn nanoantennas and explore the mechanism of nanofocusing. Although the dimensions of antenna...
Recent experiments on four-photon nonlinear exposure of photoresist near nanoplasmonic structures raise a question: What nonlinear processes are responsible for the observed profile? Here, we study the nonlinear exposure of poly(methyl methacrylate) (PMMA) in the near-field of gold nanoantennas. We consider six possible nonlinear processes and study them in terms of the developed volumes and the exposure...
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