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arXiv 1001.3785physics.optics
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凹等离子体激元粒子:近红外宽带几何可调性

Concave Plasmonic Particles: Broad-Band Geometrical Tunability in the Near Infra-Red

Nikolai Berkovitch, Pavel Ginzburg, Meir Orenstein

摘要:

实验上,具有凹截面的等离子体纳米粒子阵列显示出跨越近和短波长红光光谱区的光学共振。粒子的介电常数被证明是使共振频率的宽带可调谐性的关键成分,即使对于具有统一阶的尺寸纵横比的粒子。设置的谐振波长的非典型的灵活性示出源于一个独特的相互作用的局部几何形状与表面电荷分布。

英文摘要:

Optical resonances spanning the Near and Short Infra-Red spectral regime were exhibited experimentally by arrays of plasmonic nano-particles with concave cross-section. The concavity of the particle was shown to be the key ingredient for enabling the broad band tunability of the resonance frequency, even for particles with dimensional aspect ratios of order unity. The atypical flexibility of setting the resonance wavelength is shown to stem from a unique interplay of local geometry with surface charge distributions.

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