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Detection of fungi using a long-period fibre grating

1Gambhir M., 1Gupta S., 2John P., 3Mahakud R., 3Kumar J. and 3Prakash O. 

1ECED, SVNIT, Surat, India
2Department of Plant Pathology, Navsari Agriculture University, Navsari, India
3Laser System Engineering Division, RRCAT, Indore, India

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Abstract. We present the first-time application of long-period fibre gratings written with a copper-vapour laser for detection of fungi in plants. The long-period gratings are used for identification of Trichoderma fungi species. A significance of our work lies in the facts that these bioagents protect plant roots against pathogens that can cause serious fungal diseases, resulting in great crop yield losses and, moreover, these can cause a lethal effect on human beings. We study such Trichoderma species as T. Harzianum, T. Viride and T. Longibacterium. They reveal characteristic attenuation peaks respectively at the resonance wavelengths 1524, 1520 and 1522 nm. The corresponding transmission dips change from 63.75 dB for the case of water to 54.85, 57.34 and 59.76 dB for the cases of water solutions of T. Harzianum, T. Viride and T. Longibacterium, respectively.

Keywords: long-period fibre gratings, surrounding refractive index,  linearly polarized modes

PACS: 07.07.Df, 42.81.Pa
UDC: 535.8
Ukr. J. Phys. Opt. 18 77-82
doi: 10.3116/16091833/18/2/77/2017
Received: 04.12.2016

Анотація. Вперше продемонстровано можливість застосування довгоперіодичних волоконних дифракційних ґраток, записаних за допомогою лазера на парах міді, для виявлення грибів у рослинах. ЦІ довгоперіодичні ґратки використано для ідентифікації видів грибів Trichoderma. Значимість наших об’єктів полягає в тому, що ці біоагенти захищають коріння рослин від патогенних мікроорганізмів, які можуть викликати серйозні грибкові захворювання, що призводять до значних втрат врожайності і, крім того, ці об’єкти можуть мати летальний вплив на людину. Такі види Trichoderma як Т. Harzianum, Т. Viride і Т. Longibacterium виявляють характерні піки загасання відповідно на резонансних довжинах хвиль 1524, 1520 і 1522 нм. Відповідні провали в оптичному пропусканні зменшуються від 63,75 дБ для води до 54,85, 57,34 і 59,76 дБ для водних розчинів Т.Harzianum, Т. Viride і Т. Longibacterium, відповідно.
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