Resonance wavelengths of silver–gold compound metal island films
Resonance wavelengths of silver–gold compound metal island films
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银金复合金属岛膜的共振波长
DOI：
10.1364/josab.12.002372
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发表时间：
1995
影响因子：
1.9
通讯作者：
M. Miyagi
中科院分区：
文献类型：
--
作者：
K. Baba;T. Okuno;M. Miyagi
银金复合金属岛（CMI）薄膜的共振波长可以通过控制银和金的混合比例来轻松定义。我们通过用扫描电子显微镜观察薄膜的微观结构来研究其机理。混合比例的调整引起的谐振波长的变化归因于两个重要因素：（1）岛形状的变化和（2）银金合金介电常数的变化。对于富含银的CMI薄膜，岛形状根据混合比例略有变化，变成接近球形或长椭球体。另一方面，对于富含金的 CMI 薄膜，随着金变得更丰富，岛形状变得更扁。因此，认为谐振波长偏移主要是由富银和富金CMI薄膜的介电常数和岛形状的变化引起的。根据扫描电子显微镜观察理论上计算的共振波长与测量的共振波长相似。
The resonance wavelength of a silver–gold compound metal island (CMI) film can be easily defined by the control of the mixture ratio of silver and gold. We have investigated its mechanism by observing the film microstructure with a scanning electron microscope. The shift of the resonance wavelength induced by the adjustment of the mixture ratio is attributed to two important factors: (1) the changes of the island shape and (2) the changes of the dielectric constant of the silver–gold alloy. For silver-rich CMI films, the island shape slightly changes according to the mixture ratio and becomes near spherical or prolate ellipsoidal. On the other hand, for gold-rich CMI films, the island shape becomes more oblate as the gold becomes richer. Therefore the resonance wavelength shifts are considered to be caused mainly by the changes of the dielectric constant and the island shape for the the silver-rich and the gold-rich CMI films, respectively. The resonance wavelengths calculated theoretically from the scanning electron microscope observations are similar to the measured ones.