Quantum theory of surface polariton Cherenkov light radiation source and its fluctuation
Quantum theory of surface polariton Cherenkov light radiation source and its fluctuation
复制标题
表面极化子切伦科夫光辐射源及其涨落的量子理论
DOI：
10.1063/1.5086697
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发表时间：
2019-05
影响因子：
4
通讯作者：
Liu S
中科院分区：
文献类型：
--
作者：
Yu C;Liu S
如果电子束激发表面等离子体激元（SPP）的速度超过介质中的光速，则会发射切伦科夫辐射。本文对表面极化子切伦科夫光辐射源这一重要的物理现象进行了量子理论研究。利用这一理论，得到了SPCLS中的平均场幅值。计算结果表明，基于电磁场的量子特性和表面等离子体的作用，量子理论可以精确地解释经典现象，预测光子的非经典激发通道。这些激发通道可以用来缩短切伦科夫探测器的响应时间。量子理论还表明，与真空涨落占主导地位的普通电磁系统相比，SPCLS具有不同的涨落模式。这种涨落模式有两个显著的特点：第一，在宏观情况下，SPCLS的涨落不会消失，这可能引起理论和实验的兴趣;第二，SPCLS的涨落可以通过电子束的速度来调节。因此，SPCLS的涨落可以通过随机共振来增强辐射。我们的研究表明，在宏观电磁问题中引入量子理论可以发现一些重要现象：当电子束激发表面等离子体激元（SPPs）的速度超过介质中的光速时，将产生切伦科夫辐射。本文对表面极化子切伦科夫光辐射源这一重要的物理现象进行了量子理论研究。利用这一理论，得到了SPCLS中的平均场幅值。计算结果表明，基于电磁场的量子特性和表面等离子体的作用，量子理论可以精确地解释经典现象，预测光子的非经典激发通道。这些激发通道可以用来缩短切伦科夫探测器的响应时间。量子理论还表明，与真空涨落占主导地位的普通电磁系统相比，SPCLS具有不同的涨落模式。这种涨落模式有两个显著的特点：第一，在宏观情况下，SPCLS的涨落不会消失，这可能引出理论上的解释。
If the speed of the electron beam excited Surface Plasmon Polaritons (SPPs) exceeds the velocity of light in medium, Cherenkov radiation will be emitted. Here, on this important physical phenomenon, Surface Polariton Cherenkov Light Radiation Source (SPCLS), the quantum theory has been worked out. By this theory, the average field amplitude in SPCLS is obtained. The calculation results show that the quantum theory can explain the classical phenomena precisely and predict nonclassical excitation channels of photons that are based on the quantum nature of the electromagnetic field and the effect of SPPs. These excitation channels can be used to shorten the response time of Cherenkov detectors. The quantum theory also shows that SPCLS has a different fluctuation pattern compared with the ordinary electromagnetic systems where vacuum fluctuation dominates. The fluctuation pattern has two significant characteristics: first, the fluctuation of SPCLS will not vanish in the macroscopic case, which may draw theoretical and experimental interest; second, the fluctuation of SPCLS can be tuned by the velocity of the electron beam. Thus, the fluctuation of SPCLS can be used to enhance the radiation through stochastic resonance. Our investigation shows that important phenomena may be found out with the introduction of quantum theory in macroscopic electromagnetic problems.If the speed of the electron beam excited Surface Plasmon Polaritons (SPPs) exceeds the velocity of light in medium, Cherenkov radiation will be emitted. Here, on this important physical phenomenon, Surface Polariton Cherenkov Light Radiation Source (SPCLS), the quantum theory has been worked out. By this theory, the average field amplitude in SPCLS is obtained. The calculation results show that the quantum theory can explain the classical phenomena precisely and predict nonclassical excitation channels of photons that are based on the quantum nature of the electromagnetic field and the effect of SPPs. These excitation channels can be used to shorten the response time of Cherenkov detectors. The quantum theory also shows that SPCLS has a different fluctuation pattern compared with the ordinary electromagnetic systems where vacuum fluctuation dominates. The fluctuation pattern has two significant characteristics: first, the fluctuation of SPCLS will not vanish in the macroscopic case, which may draw theore...
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