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arXiv 1206.7076physics.optics
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双曲介质的格林函数

Green function for hyperbolic media

Andrey S. Potemkin, Alexander N. Poddubny, Pavel A. Belov, Yuri S. Kivshar

摘要:

我们重新审视均匀双曲介质的电磁格林函数的问题,其中的介电常数张量的纵向和横向分量具有不同的符号。我们分析了偶极发射模式的偶极子方向相对于对称轴和不同的符号的介电常数,并表明,发射模式是高度各向异性的,并具有一个特征的十字形:波传播在一定的锥和渐逝这个锥外。我们证明了由于发射的非凡TM偏振波和椭圆形图案由于发射的普通TE偏振波的锥形图案的共存。我们发现格林函数中存在一个奇异的复项,它与$δ-$函数成正比,并控制双曲介质中的光子态密度和Purcell效应。

英文摘要:

We revisit the problem of the electromagnetic Green function for homogeneous hyperbolic media, where longitudinal and transverse components of the dielectric permittivity tensor have different signs. We analyze the dipole emission patterns for both dipole orientations with respect to the symmetry axis and for different signs of dielectric constants, and show that the emission pattern is highly anisotropic and has a characteristic cross-like shape: the waves are propagating within a certain cone and are evanescent outside this cone. We demonstrate the coexistence of the cone-like pattern due to emission of the extraordinary TM-polarized waves and elliptical pattern due to emission of ordinary TE-polarized waves. We find a singular complex term in the Green function, proportional to the $δ-$function and governing the photonic density of states and Purcell effect in hyperbolic media.

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