Terahertz-regime attenuation signatures in Bacillus subtilis and a model based on surface polariton effects

被引：11

作者：

Brown, Elliott R. ^{[1
]}

Khromova, Tatyana B.

Globus, Tatiana

Woolard, Dwight L.

Jensen, James O.

Majewski, Alexander

机构：

[1] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA

[2] USA, Edgewood Chem & Biol Ctr, Edgewood, MD 21010 USA

[3] Goodrich Corp, Danbury, CT 06810 USA

[4] Univ Virginia, Dept Elect & Comp Engn, Charlottesville, VA 22904 USA

[5] USA, Res Off, Res Triangle Pk, NC 27709 USA

来源：

IEEE SENSORS JOURNAL | 2006年 / 6卷 / 05期

关键词：

Bacillus subtilis; ellipsoidal particle scattering; peptidoglycan; polariton; resonant polarizability; spore coat; transverse optical phonon;

D O I：

10.1109/JSEN.2006.881354

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 [电气工程]; 0809 [电子科学与技术];

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.

引用

页码：1076 / 1083

页数：8

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