[14p-P1-1~9] 3.1 Basic optics and frontier of optics

[14p-P1-2] Complex refractive indices of a noble metal (Pt or Au) fine pipe

〇Fumiaki Tajima¹, Yoshio Nishiyama¹ (1.Yokohama Nat. Univ.)

Keywords:complex refractive index, fine Pt or Au pipe, light scattering

The complex refractive indices of a Pt- or Au-pipe of a subwavelength in diameter have been found to be different from those of metal thin films for the first time. The metal pipe is made from a spider silk of a half-wavelength diameter clad with Pt or Au and illuminated by a plane polarized laser of wavelength 660 nm at normal incidence. Angular distribution of light intensity scattered by the pipe is measured and fitted by theoretical calculations based on the corresponding model. The fitting results have lead to the optimum values and uncertainty ranges of the indices and diameter of the pipe. A field emission electron microscope confirms the diameter of the optical estimation and reveals an image of the surface of the pipe.