Pratibha R, Park K, Smalyukh I I, Park W
Department of Electrical and Computer Engineering, University of Colorado, Boulder, Colorado, USA.
Opt Express. 2009 Oct 26;17(22):19459-69. doi: 10.1364/OE.17.019459.
Effect of the surrounding anisotropic liquid crystal medium on the surface plasmon resonance (SPR) exhibited by concentrated suspensions of gold nanospheres has been investigated experimentally and compared with the Mie scattering theory. The observed polarization-sensitive SPR and the red-shift in the SPR wavelength with increasing concentration of the gold nanospheres in the liquid crystal matrix have been explained using calculations based on the Maxwell Garnet effective medium theory. Agglomeration of the gold nanospheres that could also lead to such a red-shift has been ruled out using Atomic force microscopy study of thin nanoparticle-doped smectic films obtained on solid substrates. Our study demonstrates feasibility of obtaining tunable optical bulk metamaterials based on smectic liquid crystal - nanoparticle composites.
研究了周围各向异性液晶介质对金纳米球浓缩悬浮液所表现出的表面等离子体共振（SPR）的影响，并与米氏散射理论进行了比较。基于麦克斯韦 Garnet 有效介质理论的计算，解释了所观察到的偏振敏感 SPR 以及随着液晶基质中金纳米球浓度增加 SPR 波长的红移现象。通过对在固体基板上获得的掺杂纳米颗粒的近晶薄膜进行原子力显微镜研究，排除了金纳米球团聚也可能导致这种红移的可能性。我们的研究证明了基于近晶液晶 - 纳米颗粒复合材料获得可调谐光学体超材料的可行性。
