Nanobump structures are fabricated on the gold thin film by femtosecond laser direct writing (fs-LDW) technique. The
height and diameter of the gold nanobump are about 30nm, and 400 nm, respectively. The scattering light of surface
plasmon wave radiated from a nanobump is observed using a total internal reflection microscopy. A quarter-circle
structure composed of nanobumps is designed and produced to manipulate scattering light into specific pattern: The
focusing and diverging of the quarter circular structure in three dimensional space are demonstrated. The polarization
properties of focusing spot are also examined.
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