在太赫兹频率区域中，取向纳米粒子的偏振效应。

Polarizing effect of aligned nanoparticles in terahertz frequency region.

机构信息

Department of Chemical, Biological and Macromolecular Sciences, Unit for Nano Science and Technology, S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata, India.

出版信息

Opt Lett. 2013 Aug 1;38(15):2754-6. doi: 10.1364/OL.38.002754.

DOI:10.1364/OL.38.002754

PMID:23903132

Abstract

We report the polarizing behavior of aligned Ni nanoparticles (NPs) having average diameter of 165±15 nm in ~210 μm thick polyvinyl alcohol (PVA) matrix in the frequency range of 0.2-1.6 THz. The NPs have been prepared via a wet chemical route and then aligned in PVA film by using an external magnetic field. When the polarization of THz electric field is parallel to the NPs alignment direction, a strong THz absorption is observed whereas a minimum THz absorption is noticed for the corresponding perpendicular configuration. Degree of polarization is calculated to be 0.9±0.08. Considering the good polarizing performance, ease of preparation, durability, and low maintenance, this aligned NP system is a perfect candidate to emerge as a potential THz polarizer.

摘要

我们报告了在频率范围为 0.2-1.6 THz 下，具有平均直径为 165±15nm 的排列镍纳米颗粒（NPs）在~210μm 厚的聚乙烯醇（PVA）基质中的偏振行为。NPs 通过湿化学途径制备，然后通过外部磁场在 PVA 薄膜中排列。当太赫兹电场的偏振方向与 NPs 排列方向平行时，观察到强烈的太赫兹吸收，而对于相应的垂直配置，则观察到最小的太赫兹吸收。偏振度计算为 0.9±0.08。考虑到良好的偏振性能、制备的简便性、耐久性和低维护性，这种排列的 NP 系统是作为潜在太赫兹偏振器的理想候选者。