Wei-Lun HsuChia Min ChangCheng Hung ChuI-Da ChiangMin Lun TsengYao-Wei HuangHsin Wei HuangBo Han ChenDING-WEI HUANGDin Ping Tsai2018-09-102018-09-102013-10http://scholars.lib.ntu.edu.tw/handle/123456789/381622https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087598158&doi=10.1364%2ffio.2013.ftu3a.13&partnerID=40&md5=3b0423316b34d18b8d52be9054258eaeGold nanobumps on the surface of a gold thin film would scatter surface plasmon wave to forward and backward scattering light. Both dot array and chains of gold nanobumps are built to demonstrate the light-manipulating properties. While fan-shaped forward scattering light from individual nanobump is observed, three-dimensional (3-D) light focusing and diverging properties is found from quarter circle structure composed of nanobumps. Nanobumps with their heights of 16nm can deflect the surface plasmon waves to produce 3-D focusing at 3.6 micron above the surface of gold film. Experiment results clearly demonstrate that 3-D forward and backward focusing from gold nanobumps are with different amplitudes and directions of the vertical propagation vectors. © OSA 2013.Focusing; Forward scattering; Gold; Light scattering; Surface plasmons; Thin films; Dot array; Forward-and-backward; Gold film; Gold thin films; Propagation vector; Quarter circles; Surface plasmon waves; Threedimensional (3-d); Lightconference paper10.1364/fio.2013.ftu3a.132-s2.0-84898645329