Electric-Field Induced Shift in the Plasmon Resonance Due to the Interfacial Pockels Effect of Water on a Silver Surface

被引:10
作者
Nishi, Yurina [1 ]
Watanabe, Ryosuke [2 ]
Sasaki, Subaru [1 ]
Okada, Akihiro [1 ]
Seto, Keisuke [1 ]
Kobayashi, Takayoshi [3 ,4 ,5 ]
Tokunaga, Eiji [1 ,6 ]
机构
[1] Tokyo Univ Sci, Dept Phys, Fac Sci, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan
[2] Hirosaki Univ, Fac Sci & Technol, Dept Elect & Informat Technol, Hirosaki, Aomori 0368561, Japan
[3] Univ Electrocommun, Adv Ultrafast Laser Res Ctr, Chofu, Tokyo 1828585, Japan
[4] Univ Electrocommun, Dept Engn Sci, Chofu, Tokyo 1828585, Japan
[5] Natl Chiao Tung Univ, Dept Electrophys, 1001 Ta Hsueh Rd, Hsinchu 300, Taiwan
[6] Tokyo Univ Sci, Res Ctr Water Frontier Sci & Technol, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan
来源
APPLIED SCIENCES-BASEL | 2021年 / 11卷 / 05期
基金
日本学术振兴会;
关键词
Pockels effect; surface plasmon polariton; water; interface; electric double layer; electro-modulation spectroscopy; silver; penetration depth; attenuated total reflection; optical modulation; DOUBLE-LAYER; MODULATOR;
D O I
10.3390/app11052152
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In the research on application of an optical modulator used for information communication, materials having a large Pockels effect, a refractive index change proportional to the electric-field, are required. It is known that the interfacial water on the surface of transparent oxide electrodes has a giant Pockels coefficient, which is an order of magnitude larger than the solid Pockels crystals practically used. It is important to know the Pockels coefficient of water on not only an oxide surface, but also a metal surface to understand the mechanism of the interfacial Pockels effect of water. However, a method has not yet been established for evaluating the coefficient of water-metal interface. Here we present an evaluation method of the Pockels coefficient of interfacial water on a metal (silver) surface from the spectral shift of the surface plasmon polariton resonance due to electric-field induced refractive index change of the interfacial water. The Pockels coefficient of interfacial water on Ag was evaluated as |r33|=5 +/- 1 pm/V, without need for exact knowledge of the thickness of the interfacial layer (electric double layer of water) as long as the penetration depth of the plasmon is larger than the thickness.
引用
收藏
页码:1 / 17
页数:17
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