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| Title: | Optical second harmonic generation analysis of the atomically stepped Au/TiO_2 (320) interface |
| Authors: | Haque, Md Ehasanul
Kobayashi, Daiki
Tomatsu, Yuki
Hien, Khuat Thi Thu
Mizutani, Goro
Rahman, Mohammad Mizanur
Rutt, Harvey N. |
| Keywords: | photocatalyst
titanium dioxide
Au
optical second harmonic generation (SHG)
step |
| Issue Date: | 2017-12 |
| Publisher: | American Institute of Physics |
| Magazine name: | AIP Advances |
| Volume: | 7 |
| Number: | 12 |
| Start page: | 125011-1 |
| End page: | 125011-10 |
| DOI: | 10.1063/1.5006847 |
| Abstract: | A gold thin film with the thickness of 2nm on the TiO_2(320) substrate has been fabricated in a UHV chamber at the pressure of 2x10^<-7> Torr. We observed the second harmonic response from the Au/TiO_2(320) interface and bare TiO_2(320) as a function of the rotation angle around the surface normal by using of a pulsed Nd^<3+>:YAG laser as the excitation light at a photon energy of 1.17 eV and 2.33 eV. An isotropic response was observed from both samples for 1.17 eV photon energy excitation. In contrast, an anisotropic response was observed from both samples for 2.33 eV photon energy excitation. From the Au/TiO_2(320) interface, anisotropic structure of SHG response was observed in the [2^^⎯30] direction for Pin/Pout polarization combination. Nonlinear susceptibility elements were decomposed and two groups of them were assigned as the main contribution from the step and terrace of the vicinal TiO_2 surface. |
| Rights: | Copyright 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following article appeared in Md Ehasanul Haque, Daiki Kobayashi, Yuki Tomatsu, Khuat Thi Thu Hien, Goro Mizutani, Mohammad Mizanur Rahman, and Harvey N. Rutt, AIP Advances, 7(12), 125011 (2017) and may be found at http://dx.doi.org/10.1063/1.5006847 |
| URI: | http://hdl.handle.net/10119/15082 |
| Material Type: | publisher |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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