Journal ArticleDOI
Tunable optical negative-index metamaterials employing anisotropic liquid crystals
Xiande Wang,Do-Hoon Kwon,Douglas H. Werner,Iam-Choon Khoo,Alexander V. Kildishev,Vladimir M. Shalaev +5 more
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TLDR
In this paper, a full-wave analysis technique based on the finite element-boundary integral method is developed and used to rigorously treat the scattering from periodically structured metamaterials incorporating anisotropic liquid crystals (LCs) and dispersive materials.Abstract:
A full-wave analysis technique based on the finite element-boundary integral method is developed and used to rigorously treat the scattering from periodically structured metamaterials incorporating anisotropic liquid crystals (LCs) and dispersive materials. Reconfiguration of the negative-index metamaterials is achieved by controlling the magnetic resonance via tuning permittivity of the embedded anisotropic LCs. Numerical results show that the refractive index of the metamaterials can be reconfigured by tuning the director orientation of anisotropic LCs or by using temperature-dependent LCs. The design configurations and their characteristics in the near- and the mid-infrared ranges are presented.read more
Citations
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Tunable enhanced spontaneous emission in plasmonic waveguide cladded with liquid crystal and low-index metamaterial.
TL;DR: It is demonstrated by an explicit theoretical calculation that a plasmonic waveguide cladded with liquid crystals (LCs) and low-index metamaterials can give rise to an enhancement in the intrinsic SE rate γ0 of more than two orders of magnitude.
Journal ArticleDOI
A novel thermo-tunable band-stop filter employing a conductive rubber split-ring resonator
TL;DR: In this paper, the authors present the design and related applications of a thermally tunable band-stop filter employing conductive rubber that incorporates electrically conductive particles, and the relationship between the environmental temperature and the volume resistivity of conductive materials was experimentally established.
Journal ArticleDOI
Electrically excited inverse electron spin resonance in a split-ring metamaterial resonator.
TL;DR: Surprisingly, the observed electron-spin resonance signal is seen as a maximum in the field-dependent transmittance, which indicates strong modifications of the metamaterial parameters in the coupled regime.
Journal ArticleDOI
Terahertz Devices Using the Optical Activation of GeTe Phase Change Materials: Toward Fully Reconfigurable Functionalities
Maxime Pinaud,Georges Humbert,Sebastian Engelbrecht,Lionel Merlat,Bernd M. Fischer,Aurelian Crunteanu +5 more
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Wide-angle switchable negative refraction in high birefringence nematic liquid crystals
Dan Jia,Chengliang Yang,Zenghui Peng,Xiaoping Li,Yonggang Liu,Lishuang Yao,Zhaoliang Cao,Quanquan Mu,Lifa Hu,Xinghai Lu,Li Xuan +10 more
TL;DR: In this paper, a controllable negative refraction with large refraction angle at visible wavelength in the novel high birefringence (Δn) liquid crystals was demonstrated.
References
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Journal ArticleDOI
Optical Constants of the Noble Metals
P. B. Johnson,R. W. Christy +1 more
TL;DR: In this paper, the optical constants for the noble metals (copper, silver, and gold) from reflection and transmission measurements on vacuum-evaporated thin films at room temperature, in the spectral range 0.5-6.5 eV.
Journal ArticleDOI
Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients
TL;DR: In this article, the authors analyzed the reflection and transmission coefficients calculated from transfer matrix simulations on finite lengths of electromagnetic metamaterials, to determine the effective permittivity and permeability.
Journal ArticleDOI
Infrared refractive indices of liquid crystals
TL;DR: In this article, the authors used the extended Cauchy equations to link the visible refractive indices to infrared, where the refractive index measurements are more difficult, and extrapolated results almost strike through the measured data.