Terahertz Radiation Transport in Photonic Glasses,Annalen Der Physik

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Terahertz Radiation Transport in Photonic Glasses
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-07-08 , DOI: 10.1002/andp.202000005
Silvia Gentilini ₁ , Mauro Missori ₁ , Neda Ghofraniha ₁ , Claudio Conti ₁

Affiliation

Multiple scattering of electromagnetic (EM) waves arises in disordered media with a refractive index varying on the scale of the wavelength. The diffusion approximation is a powerful tool to treat multiple scattering as a photon random walk, neglecting resonant phenomena. However, as the light intensity varies on a scale much smaller than the transport mean free path, resonances may occur in media formed by finite‐size scatterers and break the diffusion approximation. The energy and phase velocity are very useful tools to reveal the onset of the resonant transport regime. In this paper the study of the propagation of terahertz (THz) waves through 3D random media by employing terahertz time‐domain spectroscopy (THz‐TDS) is addressed. Specifically, measurements of the electric field transmitted by samples of different thicknesses made of 1 mm diameter silica spheres dispersed in a paraffin matrix at different filling fractions are reported. This investigation has provided an accurate measurement of the EM field phase and, hence, information on the radiation propagation velocity that has enabled the first observation of a photonic glass at the THz range.

中文翻译：

光子眼镜中的太赫兹辐射传输

电磁波（EM）的多重散射出现在无序的介质中，其折射率随波长的大小而变化。扩散近似是将多重散射视为光子随机游走而忽略共振现象的有力工具。但是，由于光强度的变化幅度远小于传输平均自由程，因此在有限尺寸的散射体形成的介质中可能会发生共振，从而破坏了扩散近似。能量和相速度是揭示共振传输机制开始的非常有用的工具。本文着重研究了太赫兹（THz）波通过3D随机介质传播的研究，方法是使用太赫兹时域光谱（THz-TDS）。特别，报道了由以不同填充率分散在石蜡基质中的直径为1 mm的二氧化硅球制成的不同厚度的样品传输的电场的测量结果。这项研究提供了EM场相位的精确测量值，因此，提供了有关辐射传播速度的信息，该信息使人们能够首次观察到THz范围的光子玻璃。

更新日期：2020-07-08

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