光子晶格中的无反射势和不可见势
Reflectionless and invisible potentials in photonic lattices
摘要：
离散光子晶格上任意形状的光学势，当其横向漂移速度大于晶格带光锥所允许的最大速度时，将成为无反射的。这样一个有趣的结果，它产生于离散平移对称的晶格，是特有的离散光，并没有任何对应的光散射在连续的光学介质。Kramers-Kronig类型的漂移非厄米光学势也是不可见势，即离散光束穿过漂移势而不被扭曲、延迟或推进。
英文摘要：
An arbitrarily-shaped optical potential on a discrete photonic lattice, which transversely drifts at a speed larger than the maximum one allowed by the light cone of the lattice band, becomes reflectionless. Such an intriguing result, which arises from the discrete translational symmetry of the lattice, is peculiar to discretized light and does not have any counterpart for light scattering in continuous optical media. A drifting non-Hermitian optical potential of the Kramers-Kronig type is also an invisible potential, i.e. a discrete optical beam crosses the drifting potential without being distorted, delayed nor advanced.
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