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Plasmonic Metamaterials for Sensing Applications

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Biosensors".

Deadline for manuscript submissions: closed (10 September 2021) | Viewed by 7230

Special Issue Editor


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Guest Editor
Department of Electrical and Computer Engineering, Rice University, 6100 Main St, Houston, TX 77005, USA
Interests: nanoplasmonics; nanophotonics; metamaterials; biological and biochemical sensing; computational electromagnetics
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Special Issue Information

Dear Colleagues,

The hype-cycle profile of plasmonics technology shows that this promising counterpart of photonics has entered a new phase in recent years owing to its intriguing properties in the development of modern applications in diverse fields, including but not limited to medical diagnostics and label-free genetic analysis, cellular level imaging, astronomy, security and defense industries, nondestructive quality control, high-bandwidth communication, and computing. This extensive range of applications has thrust plasmonics research from relative obscurity into the limelight. Pioneering efforts in plasmonic devices and platforms date back to the turn of the century with the demonstration of lasers, filters, and biosensors. The recent advancements in artificial materials research have enabled the emergence of novel and high-power sources, and the potential of plasmonics for advanced physics research and commercial purposes has been validated. Driven by the ongoing race to boost both responsivity and efficiency of plasmonic tools, researchers are now able to tailor and fabricate plasmonic instruments in exquisite architectures. In modern clinical applications, plasmonic metastructures provide nondestructive, nonpoisonous, noncontact, label-free, and fast detection of biomarkers’ fingerprints at ultralow densities with high precision. In spite of remarkable advancements in plasmonic technologies for pharmacological purposes, efforts are being continuously made to implement high-responsive, low-cost, on-chip, and accurate coming generation plasmonic biological sensors.

Keeping the progresses, challenges, and future prospects in mind, this Special Issue of Sensors entitled “Plasmonic Metamaterials for Sensing Applications” focuses on fundamental and applied research in order to devise and develop ultraprecise plasmonic sensors and metasensors.

Dr. Arash Ahmadivand
Guest Editor

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Published Papers (2 papers)

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8 pages, 1749 KiB  
Letter
Determination of Permittivity of Dielectric Analytes in the Terahertz Frequency Range Using Split Ring Resonator Elements Integrated with On-Chip Waveguide
by Sae June Park and John Cunningham
Sensors 2020, 20(15), 4264; https://doi.org/10.3390/s20154264 - 30 Jul 2020
Cited by 7 | Viewed by 3315
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Plasmonic Metamaterials for Sensing Applications)
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7 pages, 1126 KiB  
Letter
Effect of Substrate Etching on Terahertz Metamaterial Resonances and Its Liquid Sensing Applications
by Sae June Park and John Cunningham
Sensors 2020, 20(11), 3133; https://doi.org/10.3390/s20113133 - 01 Jun 2020
Cited by 9 | Viewed by 3237
Abstract
We investigate the effect of substrate etching on terahertz frequency range metamaterials using finite-element method simulations. A blue shift was found in the metamaterial resonance with increasing substrate etch depth, caused by a decrease in the effective refractive index. The relative contribution of [...] Read more.
We investigate the effect of substrate etching on terahertz frequency range metamaterials using finite-element method simulations. A blue shift was found in the metamaterial resonance with increasing substrate etch depth, caused by a decrease in the effective refractive index. The relative contribution of the substrate’s refractive index to the effective refractive index was obtained as a function of the etch depth, finding that the decay length of the electric field magnitude below the LC gap is larger for the etched metamaterials due to their lower effective refractive index. We suggest designs for a terahertz metamaterial liquid sensor utilizing substrate etching which shows a significant enhancement in sensitivity compared to unetched sensors using ethanol as an example analyte. The sensitivity of the liquid sensor was enhanced by up to ~6.7-fold, from 76.4 to 514.5 GHz/RIU, for an ethanol liquid layer with a thickness of 60 μm by the incorporation of a substrate etch depth of 30 µm. Since the region of space close to the metamaterial is the most sensitive, however, we find that for small liquid thicknesses, larger etch depths can act to decrease sensitivity, and provide quantitative estimates of this effect. Full article
(This article belongs to the Special Issue Plasmonic Metamaterials for Sensing Applications)
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