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(Color online) SEM image of the silicon surface after laser irradiation. The circularly polarized femtosecond laser at 400 nm was irradiated at 0.08 J/cm2. The two white circles are the 200 nm diameter gold spheres. The interference period is 400 nm approximately.
(Color online) The simulated result of the electric field intensity distribution z = −5 nm around a pair of gold particles on silicon. The incident electric field strength at λ = 400 nm is 1 V/m with circular polarization normal to the surface.
(Color online) The simulated result of electric field intensity distribution at z = −5 nm with a gold nano-ridge structure (200 nm height × 200 nm width) on silicon. The incident polarization is linear at λ = 800 nm, and electric vector is orthogonal to the linear nano-ridge. (a) 2D field intensity distribution. (b) Field intensity distribution along y axis (along a white line in Fig. 3(a)).
(Color online) The simulated 2D interference dot pattern of intensity at z = −5 nm induced by the L-shaped gold plasmonic structure (200 nm width × 200 nm height × 4000 nm length). The incident polarization is circular and incoming normally to the surface at λ = 800 nm. (a) Irradiation schematic. (b) 2D dot arrays.
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