Naoki Ichiji, Murat Yessenov, Kenneth L. Schepler, Ayman F. Abouraddy, and Atsushi Kubo
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引用次数: 0
摘要
时空(ST)波包是一种传播不变的脉冲光束,它能在电介质中以可调的群速度自由传播,而不会产生衍射或色散。由于 ST 波包即使只考虑一个横向维度也能保持这些特性,因此它们可以实现表面束缚波(例如金属-电介质界面上的表面等离子体极化子,我们称之为 ST-SPPs),这些波具有与自由传播波相同的独特特性。然而,由于 ST-SPPs 的时空光谱结构是其在金属表面传播不变性的关键,因此必须仔细考虑其激发方法。通过有限差分时域模拟,我们发现自由空间中适当合成的 ST 波包可以通过刻在金属表面的单个纳米级狭缝耦合到 ST-SPP 上。我们的计算证实,这种激发方法能产生表面束缚的 ST-SPP,它们在所有维度上都是局部的(因此可被视为等离子 "子弹"),在金属-电介质界面上以可调的群速度刚性传播,没有衍射或色散。
Exciting space-time surface plasmon polaritons by irradiating a nanoslit structure
Space-time (ST) wave packets are propagation-invariant pulsed optical beams that travel freely in dielectrics at a tunable group velocity without diffraction or dispersion. Because ST wave packets maintain these characteristics even when only one transverse dimension is considered, they can realize surface-bound waves (e.g., surface plasmon polaritons at a metal-dielectric interface, which we call ST-SPPs) that have the same unique characteristics as their freely propagating counterparts. However, because the spatiotemporal spectral structure of ST-SPPs is key to their propagation invariance on the metal surface, their excitation methodology must be considered carefully. Using finite-difference time-domain simulations, we show that an appropriately synthesized ST wave packet in free space can be coupled to an ST-SPP via a single nanoscale slit inscribed in the metal surface. Our calculations confirm that this excitation methodology yields surface-bound ST-SPPs that are localized in all dimensions (and can thus be considered as plasmonic “bullets”), which travel rigidly at the metal-dielectric interface without diffraction or dispersion at a tunable group velocity.