|AVS 55th International Symposium & Exhibition|
|Nanometer-scale Science and Technology||Tuesday Sessions|
|Session:||Nanowires and Nanosize Effects|
|Presenter:||T. Nguyen, Japan Advanced Institute of Science and Technology (JAIST)|
|Authors:||T. Nguyen, Japan Advanced Institute of Science and Technology (JAIST)
G. Mizutani, Japan Advanced Institute of Science and Technology (JAIST)
|Correspondent:||Click to Email|
We have fabricated bimetallic nanowire arrays as a new type of nano-material. We expect that the anisotropy at the interface in each bimetallic nanowire would raise the second harmonic generation (SHG) performance. In order to form bimetallic nanowire arrays we deposited Cu and Pt nanowires successively on the faceted NaCl(1 1 0) template by a shadow deposition method.1 The sample preparation was carried out in an ultra-high vacuum chamber of the pressure of 1.3 x 10-7 Pa. TEM images of these samples showed the average width of nanowires of 20nm and the average spacing of about 40nm. We have also fabricated a sample with a SiO layer of 5nm thickness sandwiched between the Cu and Pt nanowires, in order to remove the effect of the interface between the two metallic nanowires. We have measured the azimuthal angle dependence of the optical second-harmonic (SH) intensity from these samples at the fundamental photon energy of 2.33 eV. The SH intensity from the sample with the sandwiched SiO layer is significantly lower than that from the bimetallic nanowire sample. The patterns of the SH intensity from both samples showed two-fold symmetry. Especially for the s-in/p-out polarization combination the SH intensity pattern from the Pt/Cu bimetallic sample was quite different from that of the Pt/SiO/Cu sample.
1 A. Sugawara, G. G. Hembree, and M. R. Scheinfein, J. Appl. Phys. 82, 5662 (1997).