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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Bulk refractive-index sensitivities of the THz-range plasmon resonances on a micro-size graphene strip
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Bulk refractive-index sensitivities of the THz-range plasmon resonances on a micro-size graphene strip

机译：微米级石墨烯条上太赫兹范围等离激元共振的体折射率敏感性

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摘要

We studied numerically the potential use of a micro-size graphene strip as a surface plasmon (SP) resonance-based bulk refractive-index sensor in the THz frequency regime. Our accurate computational instrument was an in-house algorithm based on integral equations (IEs) and Nystrom discretization. The refractive-index sensitivities and figure-of-merit (FOM) values of the associated plasmon resonances were calculated. It was found that the primary plasmon mode P-1 is more sensitive to the refractive-index changes than plasmons of higher orders, although the latter demonstrated much larger FOM values explained by the higher Q-factors. The FOM values of the higher-order resonances on a graphene strip in the THz range are at a level similar to the FOM values of the localized SP resonances on a noble-metal strip in the optical range.
机译：我们从数值上研究了在THz频率范围内将微型石墨烯条用作基于表面等离振子（SP）共振的体折射率传感器的潜在用途。我们精确的计算工具是基于积分方程（IE）和Nystrom离散化的内部算法。计算了相关的等离激元共振的折射率敏感性和品质因数（FOM）值。发现初级等离激元模式P-1比高阶等离激元对折射率变化更敏感，尽管后者显示出更高的FOM值，这是由较高的Q因子解释的。在THz范围内的石墨烯带上的高阶共振的FOM值处于与光学范围内的贵金属带上的局部SP共振的FOM值相似的水平。

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