Abstract
Currently, there are many efforts to improve the electrooptical properties of liquid crystals by means of doping them with different types of nanoparticles. In addition, liquid crystals may be used as active media to dynamically control other interesting phenomena, such as light scattering resonances. In this sense, mixtures of resonant nanoparticles hosted in a liquid crystal could be a potential metamaterial with interesting properties. In this work, the artificial magnetism induced in a mixture of semiconductor nanoparticles surrounded by a liquid crystal is analyzed. Effective magnetic permeability of mixtures has been obtained using the Maxwell-Garnett effective medium theory. Furthermore, permeability variations with nanoparticles size and their concentration in the liquid crystal, as well as the magnetic anisotropy, have been studied.
Highlights
Plasmonics is a consolidated research field, due to its potential applications in many nanotechnology domains [1,2,3]
The optical behavior of an isolated nanoparticle embedded in a liquid crystal host is analyzed in order to check the appearance of a magnetic response and the spectral range in which it remains
While the dielectric anisotropy of liquid crystals is quite interesting for a large number of applications in several fields, these media do not have a remarkable magnetic response
Summary
Plasmonics is a consolidated research field, due to its potential applications in many nanotechnology domains [1,2,3]. The magnetic and electric Mie resonances in light scattering of semiconductor materials [10, 11] are analogous to the localized surface plasmon resonances in metallic nanoparticles These semiconductor nanoparticles can act as photonic nanoresonators due to the high-refractive-index contrast between them and the surrounding medium and the ratio between their size and the incident radiation wavelength. These properties lead to the appearance of both magnetic and electric resonances in the visible range of the electromagnetic spectrum [12]. Searching a noticeable magnetic anisotropy, several liquid crystals and semiconductor nanoparticles have been considered
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