Properties of Photoluminescence from Single Gold Nanorods Induced by Near-Field Two-Photon Excitation
Properties of Photoluminescence from Single Gold Nanorods Induced by Near-Field Two-Photon Excitation
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DOI：
10.1021/jp9018074
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发表时间：
2009-07-09
影响因子：
3.7
通讯作者：
Okamoto, Hiromi
中科院分区：
文献类型：
--
作者：
Imura, Kohei;Okamoto, Hiromi
利用扫描近场光学显微镜研究了单根金纳米棒在近场双光子激发下的光致发光特性。光致发光光谱显示出两个峰的波长约为550和650 nm的棒的尺寸无关，而两个光谱分量的强度比从棒到棒变化。我们讨论了所观察到的光谱特征的光致发光的电磁计算的基础上，发现所观察到的光谱特征可以解释在金纳米棒附近的局部场增强由于等离子体激元模式激发。
We investigated properties of photoluminescence from single gold nanorods induced by near-field two-photon excitation, using scanning near-field optical microscopy. Photoluminescence spectrum showed two peaks around 550 and 650 nm in wavelengths regardless of the rod dimensions, whereas the intensity ratio of the two spectral components varies from rod to rod. We discussed the observed spectral features of photoluminescence based on electromagnetic calculations and found that the observed spectral features can be explained in terms of local field enhancement in the vicinity of the gold nanorod due to plasmon-mode excitation.