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arXiv 1807.09568physics.optics
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高Q值纳米孔光子晶体平板腔中的极端太赫兹电场增强

Extremely terahertz electric-field enhancement in a high-Q photonic crystal slab cavity with nanoholes

Qijing Lu, Xiaogang Chen, Chang-Ling Zou, Shusen Xie

摘要:

利用电磁边界条件,提出了一种具有纳米孔的一维光子晶体(PC)腔体,该腔体中的缝隙效应(电位移场的垂直分量)和反缝隙效应(电场的平行分量)均能极大地增强太赫兹电场.在高折射率材料中,EM能量密度可以提高(εh/εl)^2倍,其中εh和εl分别是高折射率材料和低折射率材料的折射率。相应地,与常规太赫兹光子晶体腔相比,模式体积可以增强288倍,并且比衍射极限小三个数量级。而所提出的太赫兹腔设计也支持具有高Q > 10^4的模式,这导致自发发射的强Purcell增强超过10^6倍。我们的太赫兹腔设计是可行的,并呼吁实验演示,因为其中EM最大化的半导体层可以自然地填充有量子工程活性材料,这是发展室温相干太赫兹辐射源的潜力。

英文摘要:

A one-dimensional photonic-crystal (PC) cavity with nanoholes is proposed for extremely enhancing the THz electric fields by utilizing the electromagnetic (EM) boundary conditions, where both slot effect (for the perpendicular component of the electric displacement field) and anti-slot effect (for the parallel component of the electric field) contribute to the considerable field enhancement. The EM energy density can be enhanced in the high refractive index material by a factor of (εh/εl)^2, where εh and εl are the permittivities of the high and low refractive index materials, respectively. Correspondingly, the mode volume can be enhanced by a factor of 288 as compared with the regular THz PC cavity and is three orders of magnitude smaller than the diffraction limitation. While the proposed THz cavity design also supports the modes with high Q > 10^4, which lead to strong Purcell enhancement of spontaneous emission by a factor exceeds 10^6. Our THz cavity design is feasible and appealing for experimental demonstrations, since the semiconductor layer where the EM is maximized can naturally be filled with a quantum engineered active materials, which is potential for developing the room-temperature coherent THz radiation sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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