Enhanced sensitivity in THz plasmonic sensors with silver nanowires

Hong, J. T.; Jun, Seung Won; H., S.; Park, J. Y.; Lee, S.; Shin, Gwy-Am; Ahn, Y. H.

doi:10.1038/s41598-018-33617-2

Cited by 49 publications

(32 citation statements)

References 31 publications

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“…Metamaterials consist of arrays of resonant elements designed to resonate with incident electromagnetic waves at specific frequencies [ 10 , 11 , 12 ]. Terahertz metamaterials have received significant attention in the field of biosensors, where they can overcome problems of low-scattering cross section by their highly confined electric fields when on-resonance [ 13 , 14 , 15 , 16 , 17 ], while also affording a degree of tunability [ 18 , 19 , 20 , 21 , 22 , 23 ]. We recently demonstrated that THz metamaterials can be used to measure the permittivity of thin films and liquids at the resonant frequency of metamaterials using free-space THz-TDS measurements [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Determination of Permittivity of Dielectric Analytes in the Terahertz Frequency Range Using Split Ring Resonator Elements Integrated with On-Chip Waveguide

Park

Cunningham

2020

Sensors

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We investigate the use of finite-element simulations as a novel method for determining the dielectric property of target materials in the terahertz (THz) frequency range using split-ring resonator (SRR) sensing elements integrated into a planar Goubau line (PGL) waveguide. Five such SRRs were designed to support resonances at specific target frequencies. The origin of resonance modes was identified by investigating the electric field distribution and surface current modes in each SRR. Red-shifts were found in the resonances upon deposition of overlaid test dielectric layers that saturated for thicknesses above 10 µm. We also confirmed that the SRRs can work as independent sensors by depositing the analyte onto each individually. The relation between the permittivity of the target material and the saturated resonant frequency was obtained in each case, and was used to extract the permittivity of a test dielectric layer at six different frequencies in the range of 200–700 GHz as an example application. Our approach enables the permittivity of small volumes of analytes to be determined at a series of discrete frequencies up to ~1 THz.

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Section: Introductionmentioning

confidence: 99%

Determination of Permittivity of Dielectric Analytes in the Terahertz Frequency Range Using Split Ring Resonator Elements Integrated with On-Chip Waveguide

Park

Cunningham

2020

Sensors

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“…The sensitivity increased upon the introduction of AgNWs with an enhancement factor of more than four times. They tested the devices using PRD1 viruses, and obtained an enhancement factor of 2.5 for a slot antenna width of 3 μm [39]. 2019, Keshavarz et al demonstrated a metamaterial surface composed of an H-shaped graphene resonator located on a semiconductor film.…”

Section: Treatment Of Biomedical Samplementioning

confidence: 99%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

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“…The conductivity of the metal defines the antenna performance, such as radiation efficiency. 22 In metal nanowire networks, adjusting the length, diameter, and concentration of wires allows adjustment of the optical/THz properties that may lead to improvement of the efficiency of nanowire-based antennas. 14,18,23,24 Metal nanowires, especially silver nanowires (AgNWs), are a perspective material for nanoelectronic circuits, transparent and conductive coatings, printable antennas, and other applications.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Conductivity of Silver Nanowire Layers

Przewłoka

Smirnov

Nefedova

et al. 2021

Preprint

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We present the study of the influence of different thin silver nanowire layers on electrical and optical properties in the Terahertz (THz) frequency range. We demonstrate that the absorbance, transmittance and reflectance of the metal nanowire layers in the frequency range of 0.2~THz to 1.2~THz is non-monotonic and depends on the nanowire dimensions and density. We present and validate also a theoretical approach describing well the experimental results and allowing to model the THz response as function the nanowire layer structure. Our results pave the way toward the application of silver nanowires as a perspective material for transparent and conductive coatings, and printable antennas operating in the terahertz range – significant for future wireless communication devices.

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Enhanced sensitivity in THz plasmonic sensors with silver nanowires

Cited by 49 publications

References 31 publications

Determination of Permittivity of Dielectric Analytes in the Terahertz Frequency Range Using Split Ring Resonator Elements Integrated with On-Chip Waveguide

Determination of Permittivity of Dielectric Analytes in the Terahertz Frequency Range Using Split Ring Resonator Elements Integrated with On-Chip Waveguide

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Terahertz Conductivity of Silver Nanowire Layers

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