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首页> 外文期刊>IEEE sensors journal >Terahertz-Regime Attenuation Signatures in Bacillus subtilis and a Model Based on Surface Polariton Effects
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Terahertz-Regime Attenuation Signatures in Bacillus subtilis and a Model Based on Surface Polariton Effects

机译:枯草芽孢杆菌的太赫兹区衰减特征和基于表面极化效应的模型

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摘要

A summary is provided for terahertz attenuation signatures measured in spore-laden samples of Bacillus subtilis in three different forms: 1) concentrated powder; 2) dilute powder; and 3) aerosol. In addition to a surprising spectral narrowness, some signatures also display an increase in peak signature strength (per spore) with dilution of the sample. A model is constructed to explain this phenomenology based on the presence of optical phonons and electromagnetic interaction with the spore wall. Specifically, the spheroidal Bacillus spores admit surface modes that interact with radiation via polaritonic coupling and are underdamped if isolated from each other through a dilution or aerosol levitation. Hence, the results defy longstanding assumptions that the biomolecular-related terahertz vibrations are necessarily overdamped and have immeasurably weak attenuation.
机译:提供了以三种不同形式在枯草芽孢杆菌的满孢子样品中测量的太赫兹衰减特征的摘要:1)浓缩粉末; 2)稀释粉; 3)喷雾剂。除了令人惊讶的光谱窄度外,一些特征还随样品稀释显示峰值特征强度(每个孢子)增加。基于光学声子的存在以及与孢子壁的电磁相互作用,构造了一个模型来解释这种现象。具体而言,球形芽孢杆菌的孢子具有表面模式,该表面模式通过极化耦合与辐射相互作用,如果通过稀释或悬浮悬浮液彼此隔离,则表面阻尼不足。因此,该结果违背了长期以来的假设,即生物分子相关的太赫兹振动必定会被过度阻尼并且衰减极小。

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