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- W2087907972 startingPage "093794" @default.
- W2087907972 abstract "We propose and optimize two designs of plasmonic lens structures, concentric grooves with a central hole (CGH) and concentric grooves with a central pillar (CGP), based on a traditional structure of concentric grooves (CG). The numerical investigation based on COMSOL Multiphysics is performed to optimize the three kinds of structures by a 355 nm radially polarized laser illumination. It is found that full-width at half maximum (FWHM) is closely related to the size of the center-position, and the field enhancement effect depends on the resonant wavelength of surface plasmon polaritons, permittivity, film thickness, and groove number. Compared to a FWHM of λ/3 (λ is the wavelength of the laser beam) with the conventional CG type, the combination of localized and extended surface plasmons results in CGP and CGH parameters achieving their optimal value with a much smaller spot size of λ/8 and higher intensity enhancement for a variety of the aspect ratios of central pillar and hole. A focused ion beam was used to fabricate the three type nanostructures with high accuracy. The CGH type with a central hole 20.88 nm in diameter and the CGP type with a central pillar 55.45 nm in diameter have been successfully fabricated approximately to their optimization results." @default.
- W2087907972 created "2016-06-24" @default.
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- W2087907972 date "2015-01-08" @default.
- W2087907972 modified "2023-10-18" @default.
- W2087907972 title "Optimization of structure parameters of concentric plasmonic lens for 355 nm radially polarized illumination" @default.
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- W2087907972 doi "https://doi.org/10.1117/1.jnp.9.093794" @default.
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