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The Simulation of a Surface Plasmon Resonance Metallic Grating for Maximizing THz Sensitivity in Refractive Index Sensor Application
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Document Title
The Simulation of a Surface Plasmon Resonance Metallic Grating for Maximizing THz Sensitivity in Refractive Index Sensor Application
Author
Sathukarn A., Jia Yi C., Boonruang S., Horprathum M., Tantiwanichapan K., Prasertsuk K., Thanapirom C., Kusolthossakul W., Kasamsook K.
Name from Authors Collection
Affiliations
National Electronics and Computer Technology Center (NECTEC), NSTDA, 112 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand
Type
Article
Source Title
International Journal of Optics
ISSN
16879384
Year
2020
Volume
2020
Open Access
All Open Access, Gold
Publisher
Hindawi Limited
DOI
10.1155/2020/3138725
Format
Abstract
Nowadays, the simplicity of both designing and fabrication process of a terahertz (THz) resonator-based sensing technique leads to its ongoing development. The consumable THz resonator needs to be easily integrated into an existing terahertz time domain spectroscopy (THz TDS) measurement system. It should also be able to be fabricated in a mass scale with a low production cost. In this work, a metal-coated surface plasmon resonance- (SPR-) based sensor is simulated and designed as a low-cost refractive index sensor utilizing rigorous coupled wave analysis (RCWA). To demonstrate our methodology, we design a gold-coated grating with a polydimethylsiloxane (PDMS) as a substrate, in order to perform quantitative analysis of gasoline-toluene mixture composition, which has a refraction index variation of 0.1 at THz frequency. The grating period is tuned such that its surface plasmon resonance (SPR) frequency matches with the peak frequency of the THz TDS system. Moreover, other grating parameters, i.e., a filling factor and a grating depth, are optimized to increase the sensor sensitivity and sharpen the resonance dip. High sensitivity up to 500 GHz/RIU with a refractive index resolution up to 0.01 is numerically revealed. The H-field of the designed grating is then evaluated to indicate a strong SPR excitation. The well-developed designed grating introduces a promising, low-cost, and easily fabricated THz refractive index sensor. © 2020 Asmar Sathukarn et al.
Keyword
Cost benefit analysis | Costs | Fabrication process | Gold coatings | Laser pulses | Measurement system | Plasmons | Polydimethylsiloxane | Polydimethylsiloxane PDMS | Refractive index | Refractive index sensor | Refractometers | Resonators | Rigorous coupled wave analysis | Sensing techniques | Sensor sensitivity | Silicones | Surface plasmon resonance | Terahertz spectroscopy | Terahertz time domain spectroscopy | Time domain analysis
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
License
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Rights
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Publication Source
Scopus
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The Simulation of a Surface Plasmon Resonance Metallic Grating for Maximizing THz Sensitivity in Refractive Index Sensor ApplicationDownload