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We investigate the effects of a bar on optical transmission through Z-shaped metallic slit arrays by using the finite-difference time domain (FDTD) method. A new hybrid Fabry-Perot (FP) surface plasmon polariton (SPP) mode emerges when changing the geometric parameters of the bar, and this mode can be viewed as a coupling between FP mode and SPP mode. In addition, an obvious dip appears in a featured area when the bar deviates from the central line, and a small displacement of the bar leads to tremendous change of the dip. These behaviors can be attributed to the phase resonance. In short, the structure is very sensitive to the metal bar. Furthermore, it combines photonic device miniaturization with sensitivity, which is useful for making optical switches. 相似文献
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运用全量子理论,对腔耦合系统构建的两个节点,考虑节点内腔模与量子位(qubit)的耦合,结合数值计算,用熵表示信源的不确定性,对信源发出的信息进行度量,研究了两个节点相互进行信息传输过程的熵演化.通过两能级粒子与腔模的耦合强度、腔-腔之间的跃迁耦合系数和失谐量三个参数对熵变化进行分析,结论表明在共振条件下,节点间相互传输信息过程中,耦合双腔构成的两个节点熵呈现准周期性坍塌与复苏振荡变化特征,节点1与节点2熵的峰值交替出现;两个节点之间用跳跃频率λ/2π的光子作为信息传送的数椐总线,失谐使两个节点内量子位的一个频率高,一个频率低,无论先操纵哪一个量子位,在系统稳定工作状态下,量子态演化的信息传递方向总是从频率快的量子位向频率慢的量子位传递,此特性可扩展至多量子位之间量子信息的传递.用于两个节点间的远程操控. 相似文献
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