A Hybrid Terahertz Metamaterial Sensor Using a Hexagonal Ring Resonator with Bio-medical Applications

Appasani, Bhargav

doi:10.1007/s11468-021-01546-y

Cited by 19 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first type is the refractive index sensor, which infers the refractive index of the analyte attached to the sensor surface based on the change of the sensor’s resonant frequency. − The second type is the biosensor, capable of detecting DNA short sequences, thrombin, carcinoembryonic antigen (CEA) biomarkers, glucose, − microorganisms, and corneal tissues, ensuring food security, and identifying viruses , and cancer cells, , while some other biosensors have been achieved through on-chip design. , Furthermore, the pesticide sensor is also a hot topic, aiming to detect pesticide concentration through variations in resonant peaks (frequency or amplitude shifts). Some recent works have focused on detecting pesticides like 2,4-dichlorophenoxyacetic acid (2,4-D), chlorpyrifos-methyl, and phosalone. − In addition, other types of THz sensors include temperature metamaterial sensors for low-loss amplitude modulators and temperature-controlled THz devices, − as well as photonic sensors for ultrafast all-optical switching and precise label-free immunosensing. , …”

Section: Introductionmentioning

confidence: 99%

A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection

Wang,

Luo,

2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Terahertz (THz) waves have garnered significant interest across various fields, particularly in high-sensitivity sensing applications. Metamaterials can be employed in THz sensors, specifically for refractive index sensing and pesticide detection due to their highsensitivity characteristics. In this Article, a dual-band flexible THz metamaterial sensor based on polyimide is proposed for refractive index and pesticide sensing, which is fabricated using ultraviolet (UV) lithography technology and measured by a THz time-domain spectroscope (TDS) system. The resonant frequencies of the sensor are at 0.37 and 1.13 THz, with transmission rates of 2.9% and 0.3%, respectively. With an analyte layer attached to the sensor's surface, the sensitivity of refractive index sensing can be calculated as 0.09 and 0.28 THz/RIU (refractive index unit) at the two resonant frequencies. In order to validate the exceptional pesticide sensing performance of the sensor, chlorpyrifos-methyl acetone solutions with various concentrations are added on it. Furthermore, a monolayer of graphene is coated on the sensor's surface, which is proved capable of improving pesticide sensing sensitivity at low concentrations due to strong π−π stacking interactions with π-electrons in chlorpyrifos-methyl solutions. Therefore, the graphene-coated sensor can be utilized in detecting pesticide solutions with low concentrations, and the sensor without graphene is preferred for high concentration detection. This work provides a novel option for the THz metamaterial sensor with high sensitivity covering a wide pesticide concentration range.

show abstract

Section: Introductionmentioning

confidence: 99%

A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection

Wang,

Luo,

2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…It is also possible to obtain tunable metamaterial i.e., frequency reconfigurable by using materials like Graphene where the chemical potential decides the electrical conductivity. [9], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

High-Q and FOM Dual-Band Polarization Dependent Ultra-Narrowband Terahertz Metamaterial Sensor

et al. 2023

View full text Add to dashboard Cite

Polarization-dependent dual-band THz metamaterial using a modified Trishul structure is proposed in this paper. The absorber has three layers namely, a conducting ground plane, a dielectric substrate, and a structure top metallic patch. The top and bottom metallic is made up of gold material and the dielectric substrate is polyimide. The characteristics are obtained using the finite element method. The structure has obtained two resonant peaks at 0.78 THz(f1) and 1.65 THz(f2) for the X-polarized wave and at 0.81 THz(f3) and 1.53 THz(f4) for the Y-polarized wave respectively. The simulation result reveals that the absorber has obtained ultra-narrow band absorption with a full width half maximum(FWHM) of 4.8 GHz, 10 GHz, 5 GHz, and 10 GHz for f1, f2, f3, and f4 respectively. In addition, the underlying physical mechanism of the multi-band characteristics is analyzed using electric field and surface current distributions. The proposed absorber design has importance in the emerging THz system for polarization imaging and sensing applications. Also, flexible metamaterials could be useful for soft robotics applications also.

show abstract

“…Thus, refractive index sensors, temperature sensors, hybrid sensors, etc. have been proposed based on terahertz metamaterials [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

A Novel Terahertz Metamaterial Absorber Based on Split-Relief Design for the Application of Refractive Index Sensing

Abdulkarim

Muhammadsharif

Appasani³

et al. 2023

Preprint

View full text Add to dashboard Cite

A Hybrid Terahertz Metamaterial Sensor Using a Hexagonal Ring Resonator with Bio-medical Applications

Cited by 19 publications

References 25 publications

A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection

A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection

High-Q and FOM Dual-Band Polarization Dependent Ultra-Narrowband Terahertz Metamaterial Sensor

A Novel Terahertz Metamaterial Absorber Based on Split-Relief Design for the Application of Refractive Index Sensing

Contact Info

Product

Resources

About