Interferometric Refractive Index Sensing with Terahertz Spoof Surface Plasmons

Near field interference of spoof surface plasmons propagating on two opposing faces of a thin metal sheet waveguide perforated by a periodic array of tapered holes has been investigated by time-domain terahertz spectroscopy. Closely spaced, chirped spectral interference fringes are observed in the o...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2019-05, Vol.40 (5), p.516-523
Main Authors: Pan, Y., Hashim, S. N. M., Huggard, P. G., Andrews, S. R.
Format: Article
Language:English
Subjects:
Classical Electrodynamics
Electrical Engineering
Electronics and Microelectronics
Engineering
Instrumentation
Interference fringes
Interferometry
Metal sheets
Plasmons
Refractivity
Wave propagation
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Summary:Near field interference of spoof surface plasmons propagating on two opposing faces of a thin metal sheet waveguide perforated by a periodic array of tapered holes has been investigated by time-domain terahertz spectroscopy. Closely spaced, chirped spectral interference fringes are observed in the output near the field as a result of the different nonlinear dispersion of the two surface modes. Results illustrating the potential of such a structure for interferometric refractive index sensing of nanolitres of analytes are presented.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-019-00590-4