在纳米尺度上的Phonon增强光物质相互作用
R Hillenbrand1, T Taubner, F Keilmann
1Max-Planck-Institut für Biochemie, Abteilung Molekulare Strukturbiologie, 82152 Martinsried, Germany.
Nature
|July 12, 2002
概括
光学近距离场被极性介电网格振动 (声子) 增强,显著增强红外光物质相互作用. 这种用声波增强的合使得像碳化 (SiC) 这样的材料能够进行高度敏感的纳米级分析.
科学领域:
- 光学和光子学 在光学和光子学.
- 材料科学 材料科学 材料科学
- 频谱学是一种光谱学方法.
背景情况:
- 靠近照明物体的光学近场可以实现增强光谱和高分辨率显微镜等效果.
- 在金属纳米结构中用等离子体增强的近场合可以在纳米尺度上控制光.
- 极性介电材料具有网格振动 (声子),可以与光相互作用.
研究的目的:
- 为了研究光学近场合在红外的强增强,使用极性介电物的声子共振.
- 使用近场显微镜探测与碳化 (SiC) 样本的局部相互作用.
- 评估用于纳米级材料分析的声子增强近场合的潜力.
主要方法:
- 红外光谱学与近场显微镜相结合.
- 用碳化 (SiC) 样本探测局部光学近场相互作用.
- 描述围绕声子共振频率的光谱响应.
主要成果:
- 由于声子共振,在红外线中观察到光学近场合的显著增强.
- 在SiC中的声子共振发生在920厘米-1.1的位置.
- 在共振附近,近场信号增加了200倍,超过了来自黄金样本的信号20倍.
- 用Phonon增强的合显示对极地样本的化学和结构成分极度敏感.
结论:
- 用Phonon增强的近场合提供了一个强大的机制来增强纳米级的红外光物质相互作用.
- 这项技术使半导体和矿物质的纳米级化学和结构分析成为可能.
- SiC的稳定性表明,在纳米级光学电路中对要求苛刻的环境有潜在的应用.
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