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arXiv 1004.0217physics.optics
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金纳米结构中表面等离子体激元模的避免交叉模式和谱隙

Avoided Crossing Patterns and Spectral Gaps of Surface Plasmon Modes in Gold Nano-Structures

Alexandre Kolomenskii, Siying Peng, Jeshurun Hembd, Andrei Kolomenski, John Noel, Winfried Teizer, Hans Schuessler

摘要:

研究了超短(7 fs)宽带激光脉冲通过周期性金纳米结构的传输。透射光强度在波长和角度上的分布示出了入射p-偏振光与两个反向传播的表面等离子体(SP)模式的有效耦合。作为模式相互作用的结果,避免交叉图案表现出能量和动量间隙,这取决于纳米结构的配置和波长。观察到SP共振的宽度的变化和避免交叉区域附近的模式相互作用的突变。这些特点是由两个耦合模式的模型和耦合的变化,由于从高频暗模式切换到低频亮模式,以增加激发光的波长解释。PACS编号:73.20.Mf、42.70.Qs、42.25.- p,

英文摘要:

The transmission of ultrashort (7 fs) broadband laser pulses through periodic gold nano-structures is studied. The distribution of the transmitted light intensity over wavelength and angle shows an efficient coupling of the incident p-polarized light to two counter-propagating surface plasmon (SP) modes. As a result of the mode interaction, the avoided crossing patterns exhibit energy and momentum gaps, which depend on the configuration of the nano-structure and the wavelength. Variations of the widths of the SP resonances and an abrupt change of the mode interaction in the vicinity of the avoided crossing region are observed. These features are explained by the model of two coupled modes and a coupling change due to switching from the high frequency dark mode to the low frequency bright mode for increasing wavelength of the excitation light. PACS numbers: 73.20.Mf, 42.70.Qs, 42.25.-p,

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