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An electron beam passing over metallic gratings can generate Smith-Purcell radiation in THz region. The emission frequency and angle strongly depend on the period of gratings which is previously designed. Very recently, the enhanced Smith-Purcell radiation by surface plasmon (SP) excitation has been demonstrated. The high-energy electrons deposited on the substrate will cause the temperature of substrate...
Recently PT symmetric devices, a new class of artificial optical materials, found a tremendous interest in research where PT symmetry is maintained by balancing gain and loss regions, and therefore combined PT operation leads to interchange loss and gain and leaves the system invariant. Based on this gain/loss modulation concept, we demonstrate both experimentally and theoretically a PT symmetric...
The loop types such as the three- and four-legged loaded unit cells, the circular loops, and the square loops and the hexagonal loops are widely used to design the frequency selective surface (FSS) for a number of applications. Correlation analysis and evaluation of them are investigated in previous works. In this work, we try to use another loop, namely triangular loop, for designing the FSS. A multi...
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