Free-standing guided-mode resonance humidity sensor in terahertz

Shin, Hee Jun; SaeHyung, Kim; Park, Kisang; Lim, Min-Cheol; Choi, Sung‐Wook; Ok, Gyeongsik

doi:10.1016/j.sna.2017.10.060

Cited by 12 publications

(16 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because the particles cannot firmly lie at the top of the waveguide. Shin et al demonstrated a GMR sensor for humidity, using a spherically shaped GMR device [10]. In this study, ZrO2 particles, which are spherically shaped particles, were adopted for the grating layer, and good experimental results were reported when compared with the theoretical results.…”

Section: Resultsmentioning

confidence: 87%

“…The schematic details are shown in Figure 1. Particularly, from the effective medium theory, the grating layer in the GMR structure has the following effective refractive index [10,21]:…”

Section: Simulation Methodsmentioning

confidence: 99%

“…Recently, GMR devices operating at the terahertz (THz) frequency have received much attention for THz bandpass filters [8,9] and biological-or chemical-sensing applications [10] because a GMR device in the THz range has many advantages. For example, various conformational energies of biochemical sensing molecules can be traced to a specific GMR peak design, based on their fingerprint patterns in the THz region, which can be determined by inter-and intra-molecular energies of rotational and vibrational modes in those frequency ranges.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Terahertz Guided Mode Resonance Sensing Platform Based on Freestanding Dielectric Materials: High Q-Factor and Tunable Spectrum

Shin

2020

Applied Sciences

Self Cite

View full text Add to dashboard Cite

We theoretically investigated a polyethylene-based rectangular and guided mode resonance (GMR) structure with a circular pattern by using the finite-difference time-domain (FDTD) method in the terahertz region. As the refractive index of the grating decreased, the resonance frequency increased, and the Q-factor significantly increased because of the change in the effective refractive index. In addition, GMR was investigated with a sensing layer for sensing applications. The resonance frequency and Q-factor could be perfectly modulated by varying the complex refractive index and thickness of the sensing layer. These results indicate that GMR could be applied to highly sensitive label-free detection, using low-cost GMR sensing platforms based on dielectric materials.

show abstract

Section: Resultsmentioning

confidence: 87%

“…The schematic details are shown in Figure 1. Particularly, from the effective medium theory, the grating layer in the GMR structure has the following effective refractive index [10,21]:…”

Section: Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Terahertz Guided Mode Resonance Sensing Platform Based on Freestanding Dielectric Materials: High Q-Factor and Tunable Spectrum

Shin

2020

Applied Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…Shin et al. () built a low‐cost polymer‐based humidity sensor that works in the THz region. Polymer‐based materials have unique properties, such as variation in their hydrophobic or hydrophilic properties, after exposure to humidity.…”

Section: Food Applications Of Thz Spectroscopy and Imagingmentioning

confidence: 99%

“…Guided‐mode resonance (GMR) sensors can work in THz range, and Shin et al. () showed that the PVA‐coated GMR sensor is a good candidate for inexpensive and highly sensitive RH sensing. Although the PVA‐coated GMR sensor was very sensitive to humidity changes at 20 °C, future studies are needed to improve temperature‐dependent RH sensing techniques.…”

Section: Possible Future Advances In Thz Technologymentioning

confidence: 99%

A Comprehensive Review on Food Applications of Terahertz Spectroscopy and Imaging

Afsah‐Hejri

Hajeb

Ara

et al. 2019

Comp Rev Food Sci Food Safe

221

View full text Add to dashboard Cite

Food product safety is a public health concern. Most of the food safety analytical and detection methods are expensive, labor intensive, and time consuming. A safe, rapid, reliable, and nondestructive detection method is needed to assure consumers that food products are safe to consume. Terahertz (THz) radiation, which has properties of both microwave and infrared, can penetrate and interact with many commonly used materials. Owing to the technological developments in sources and detectors, THz spectroscopic imaging has transitioned from a laboratory‐scale technique into a versatile imaging tool with many practical applications. In recent years, THz imaging has been shown to have great potential as an emerging nondestructive tool for food inspection. THz spectroscopy provides qualitative and quantitative information about food samples. The main applications of THz in food industries include detection of moisture, foreign bodies, inspection, and quality control. Other applications of THz technology in the food industry include detection of harmful compounds, antibiotics, and microorganisms. THz spectroscopy is a great tool for characterization of carbohydrates, amino acids, fatty acids, and vitamins. Despite its potential applications, THz technology has some limitations, such as limited penetration, scattering effect, limited sensitivity, and low limit of detection. THz technology is still expensive, and there is no available THz database library for food compounds. The scanning speed needs to be improved in the future generations of THz systems. Although many technological aspects need to be improved, THz technology has already been established in the food industry as a powerful tool with great detection and quantification ability. This paper reviews various applications of THz spectroscopy and imaging in the food industry.

show abstract

Design of a terahertz metamaterial sensor based on split ring resonator nested square ring resonator

Chen

Zhang

Huang

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

A terahertz (THz) sensor based on the metamaterial structure, split ring resonator with four-gaps relied on centrosymmetric nested square ring resonator, is presented. The two resonant elements of the metamaterial structure generate a corresponding resonant valley on the transmission spectrum curve in the frequency range from 0.1 to 1.9 THz respectively, and both of these resonant valleys show different redshifts when the surface permittivity of the structure changes. This feature is very suitable for THz sensing, especially the quantum interference effect between the two resonant elements, which results in the formation of an electromagnetically induced transparency (EIT)-like resonance peak on the transmission spectrum curve. The sensing performances are simulated by using commercialized full-wave electromagnetic simulation software. The results demonstrated that the proposed sensor is polarization-insensitive and has a highly boosted sensitivity, which has a promising application prospect in the fields of biomedical science and drug industry.

show abstract

Free-standing guided-mode resonance humidity sensor in terahertz

Cited by 12 publications

References 25 publications

Terahertz Guided Mode Resonance Sensing Platform Based on Freestanding Dielectric Materials: High Q-Factor and Tunable Spectrum

Terahertz Guided Mode Resonance Sensing Platform Based on Freestanding Dielectric Materials: High Q-Factor and Tunable Spectrum

A Comprehensive Review on Food Applications of Terahertz Spectroscopy and Imaging

Design of a terahertz metamaterial sensor based on split ring resonator nested square ring resonator

Contact Info

Product

Resources

About