通过锥形矩形孔周期阵列增强太赫兹传输
Enhanced terahertz transmission through a periodic array of tapered rectangular apertures
摘要：
我们数值分析了在金属薄膜上周期性穿孔的矩形孔径阵列的太赫兹传输特性。孔以不同的角度逐渐变细，以在锥形端实现更高的场集中。周期性的亚波长尺度孔径确保等离子体行为，从而引起由周期性决定的特定频率模式的增强的传输。我们比较了相同参数的矩形孔的传输结果，并观察到锥形情况下传输的显着增加。我们比较了我们的数值模拟结果与理论，并发现他们一致。
英文摘要：
We numerically analyse extraordinary terahertz transmission properties of an array of rectangular shaped apertures perforated periodically on a thin metal film. The apertures are tapered at different angles to achieve higher field concentration at the tapered end. The periodic sub-wavelength scale apertures ensure plasmonic behaviour giving rise to the enhanced transmission of a specific frequency mode decided by the periodicity. We compare results of transmission with the rectangular shaped apertures of same parameters and observe a significant increase in the transmission for the tapered case. We have compared results of our numerical simulations with theory and have found them consistent.
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