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Conceptual illustrations of nanocups redirecting light. The magnetic field enhancement within an individual nanocup redirects light to the direction of the nanocup axis.
Fabrication procedure. (a) A NIL template was cleaned and passivated. (b) A thin layer (20 μm) of h-PDMS was spun onto the passivated NIL template, and partially cured at 65 °C for 30 min. (c) A thick layer (2 mm) of s-PDMS was poured on top of the partially cured h-PDMS. (d) A glass slide was placed on top of the s-PDMS to prevent collapse of the nanopillars. (e) The whole composite PDMS stamp was cured at 65 °C for 2 h and removed after it was fully cured. (f) A thin layer of gold (20 nm) was shadow evaporated onto a rotating substrate that is mounted at a 20° angle. (g) A large, ordered, nanocup array was created using the nanopillar template.
SEM images of the NIL template and the nanopillar array. (a) The NIL template used to fabricate the nanopillar array. (b) The nanopillar array, which is 0.5 cm × 1 cm in size. (c), (d) Close-up images of the nanopillars. The nanopillars are 100 nm in width, 120 nm in height, and 425 nm in pitch.
comsol simulations of the field ehancement and optical response of the nanocup array. Simulated enhancement of the (a) electric field (E0 = 1 V/m), (b) magnetic field (H0 = 3.67 × 10−3 A/m), and (c) extinction spectrum.
Simulations of the magnetic field of a single nanocup and a 100-nm gold nanoparticle with 30° angled incident light. (a) Magnetic field enhancement of a nanocup under s-polarized angled incident light. (b) Magnetic field enhancement of a nanocup under p-polarized angled incident light. (c) Magnetic field enhancement of a gold nanoparticle under s-polarized angled incident light. (d) Magnetic field enhancement of a gold nanoparticle under p-polarized angled incident light.
Extinction spectra of the nanocup array under (a) s-polarization and (b) p-polarization. The profile exhibits angular independence while the incidence angle (θinc) is varied from 0° to 40°.
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