共 44 条
3D printed hollow core terahertz Bragg waveguides with defect layers for surface sensing applications
被引:108
作者:

Li, Jingwen
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机构:
Ecole Polytech, Montreal, PQ H3C 3A7, Canada Ecole Polytech, Montreal, PQ H3C 3A7, Canada

Nallappan, Kathirvel
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Ecole Polytech, Montreal, PQ H3C 3A7, Canada Ecole Polytech, Montreal, PQ H3C 3A7, Canada

Guerboukha, Hichem
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机构:
Ecole Polytech, Montreal, PQ H3C 3A7, Canada Ecole Polytech, Montreal, PQ H3C 3A7, Canada

Skorobogatiy, Maksim
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h-index: 0
机构:
Ecole Polytech, Montreal, PQ H3C 3A7, Canada Ecole Polytech, Montreal, PQ H3C 3A7, Canada
机构:
[1] Ecole Polytech, Montreal, PQ H3C 3A7, Canada
关键词:
FIBER;
MODE;
SENSORS;
SPECTROSCOPY;
RESONANCES;
MICROFIBER;
D O I:
10.1364/OE.25.004126
中图分类号:
O43 [光学];
学科分类号:
070207 ;
0803 ;
摘要:
We study a 3D-printed hollow core terahertz (THz) Bragg waveguide for resonant surface sensing applications. We demonstrate theoretically and confirm experimentally that by introducing a defect in the first layer of the Bragg reflector, thereby causing anticrossing between the dispersion relations of the core-guided mode and the defect mode, we can create a sharp transmission dip in the waveguide transmission spectrum. By tracking changes in the spectral position of the narrow transmission dip, one can build a sensor, which is highly sensitive to the optical properties of the defect layer. To calibrate our sensor, we use PMMA layers of various thicknesses deposited onto the waveguide core surface. The measured sensitivity to changes in the defect layer thickness is found to be 0.1 GHz/mu m. Then, we explore THz resonant surface sensing using a-lactose monohydrate powder as an analyte. We employ a rotating THz Bragg fiber and a semi-automatic powder feeder to explore the limit of the analyte thickness detection using a surface modality. We demonstrate experimentally that powder layer thickness variations as small as 3 mu m can be reliably detected with our sensor. Finally, we present a comparative study of the time-domain spectroscopy versus continuous wave THz systems supplemented with THz imaging for resonant surface sensing applications. (C) 2017 Optical Society of America.
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收藏
页码:4126 / 4144
页数:19
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