Zero reflection and transmission in graded index media
Zero reflection and transmission in graded index media
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DOI：
10.1088/2040-8986/aa7783
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发表时间：
2017-02
影响因子：
2.1
通讯作者：
C. King;S. Horsley;T. Philbin
中科院分区：
文献类型：
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作者：
C. King;S. Horsley;T. Philbin
梯度折射率介质的电极化率满足空间Kramers-Kronig关系，已知对于所有入射角，对电磁辐射是单向无反射的。我们演示了如何一个家庭的这些媒体，除了被反射，也有可以忽略不计的传输。为此，我们讨论如何通过介质的介电常数是建立从极点在复杂的位置平面，与剩余的总和为无穷大的波的传播的传输系数，可以通过调整的位置和剩余的极点控制。特别是，我们已经展示了如何使传输任意小，从而最大限度地吸收波的能量。数值模拟证实了这种行为。
Graded index media whose electric susceptibility satisfies the spatial Kramers–Kronig relations are known to be one-way reflectionless to electromagnetic radiation, for all angles of incidence. We demonstrate how a family of these media, in addition to being reflectionless, also have negligible transmission. To this end, we discuss how the transmission coefficient for the propagation of waves through a medium whose permittivity is built from poles in the complex position plane, with residues that sum to infinity, can be controlled by tuning the positions and residues of the poles. In particular, we have shown how to make the transmission arbitrarily small, and hence maximise the absorption of the wave’s energy. This behaviour is confirmed by numerical simulations.