期刊
APPLIED PHYSICS LETTERS
卷 108, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4942969
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资金
- Office of Naval Research Global [ONRG-NICOP-N62909-15-1-N016]
- CNPq-PVE collaboration project
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1332271] Funding Source: National Science Foundation
The electric field controlled alignment of gold nanorods offers a paradigm for anisotropic molecules with the potential for a wide variety of phases and structures. We experimentally study the optical absorption from gold nanorod suspensions aligned using external electric fields. We show that the absorption from these suspensions depends linearly on the orientational order parameter. We provide evidence that the critical electric field needed to orient the gold nanorods is proportional to the nanorod volume and depolarization anisotropy. Utilizing this critical field dependence, we demonstrate for suspensions with two different nanorod sizes that the alignment of each population can be controlled. We also develop a technique to determine the imaginary parts of the longitudinal and transverse electric susceptibilities of the nanorods. The ability to selectively address specific parts of the nanorod populations in a mixture using external fields may have significant potential for future display and optical filter applications. (C) 2016 AIP Publishing LLC.
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