Negative refraction in gyrotropic media
Negative refraction in gyrotropic media
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DOI：
10.1103/physrevb.73.045114
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发表时间：
2006-01
影响因子：
3.7
通讯作者：
V. Agranovich;Y. Gartstein;A. Zakhidov
中科院分区：
文献类型：
--
作者：
V. Agranovich;Y. Gartstein;A. Zakhidov
旋向性（手性）作为空间色散的表现之一，例如，因为光的偏振面的旋转也可以在某些频率范围内导致负折射（NR）。我们讨论了均匀各向同性手征介质在非共振频域中的纵向激励频率${\ensuremath{\omega}}_{L}$，其中介电常数为零：$$（{\ensuremath{\omega}}_{L}）=0$。考虑了手征介质边界处反射和折射的基本现象，并从单手性圆偏振电磁波的负群速度出发，证明了频率低于${\ensuremath{\omega}}_{L}$时的NR。我们表明，镜面反射的极化波应该提供一种手段，直接实验检测这个频域。我们还讨论了耗散相关的限制实现NR。
The gyrotropy (chirality) as one of the manifestations of spatial dispersion responsible, e.g., for the rotation of the plane of polarization of light can also lead to negative refraction (NR) in certain frequency ranges. We discuss this effect for homogeneous isotropic chiral media in a nonresonant frequency domain close to frequency ${\ensuremath{\omega}}_{L}$ of longitudinal excitations, where dielectric permittivity vanishes: $ϵ({\ensuremath{\omega}}_{L})=0$. Basic phenomena of reflection and refraction at the boundary of a chiral medium are considered and NR is demonstrated for frequencies below ${\ensuremath{\omega}}_{L}$ as following from the negative group velocity of circularly polarized electromagnetic waves of one handedness. We show that specular reflection of the polarized waves should provide a means of direct experimental detection of this frequency domain. We also discuss dissipation-related limitations for realization of NR.