Sensing with toroidal metamaterial

Gupta, Manoj; Srivastava, Yogesh Kumar; Manjappa, Manukumara; Singh, Ranjan

doi:10.1063/1.4978672

Cited by 214 publications

(124 citation statements)

References 50 publications

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“…As a final step, the comparison of selected works is shown in Table 1. As it can be observed, the three most recent reports [54,55,57] are the ones with higher values of FOM. If we compare the two works in which the amplitude sensitivity is used, we can observe that the AS achieved by Jáuregui-López et al in ref.…”

Section: Wwwadvopticalmatdementioning

confidence: 54%

“…[46] Copyright 2010, AIP Publishing. [54] (center); SRR used in ref. [50] and corresponding amplitude reflection spectra (bottom) of the bare sample (black) and the coated sample with an 11 µm thick photoresist (red).…”

Section: From Meta-atoms To Metageometriesmentioning

confidence: 99%

“…[54] Originally, toroidal resonances are related with currents flowing on a torus surface. Concretely, Gupta et al presented in 2017 a metamaterial device based on a planar toroidal dipole.…”

Section: From Meta-atoms To Metageometriesmentioning

confidence: 99%

“…Concretely, Gupta et al presented in 2017 a metamaterial device based on a planar toroidal dipole. [54] Originally, toroidal resonances are related with currents flowing on a torus surface. To implement the toroidal characteristic in two dimensions, Gupta et al proposed a 2D metasurface made of mirrored asymmetric split ring resonators coupled through a toroidal moment due to an anti-aligned set of magnetic dipoles (see a schematic in the central panel of Figure 2c).…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

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Terahertz Sensing Based on Metasurfaces

Beruete

Jáuregui-López

2019

Advanced Optical Materials

281

113

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The terahertz (THz) band has very attractive characteristics for sensing and biosensing applications, due to some interesting features such as being a non‐ionizing radiation, very sensitive to weak interactions, thus, complementing typical spectroscopy systems in the infrared. However, a fundamental drawback is its relatively long wavelength (10–1000 µm) which makes it blind to small features, hindering seriously both thin‐film and biological sensing. Recently, new ways to overcome this limitation have become possible thanks to the advent of metasurfaces. These artificial structures are planar screens usually made of periodic metallic resonators and whose electromagnetic response can be controlled at will by design. This design freedom allows metasurfaces to surpass the restrictions of classical THz spectroscopy, by creating fine details comparable to the size of the thin films or microorganisms under test. The strong field concentration near these small metasurface details at resonance makes them highly sensitive to tiny variations in the nearby environment, allowing for an enhanced detection more accurate than classical THz spectroscopy. The main advances in THz metasurface sensors from a historical as well as application‐oriented perspective are summarized. The focus is put mainly on thin‐film and biological sensors, with an aim to cover the most recent advances in the topic.

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Section: Wwwadvopticalmatdementioning

confidence: 54%

Section: From Meta-atoms To Metageometriesmentioning

confidence: 99%

Section: From Meta-atoms To Metageometriesmentioning

confidence: 99%

Section: Wwwadvopticalmatdementioning

confidence: 99%

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Terahertz Sensing Based on Metasurfaces

Beruete

Jáuregui-López

2019

Advanced Optical Materials

281

113

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“…This sensitivity is comparable to a standard commercial fluorescence-based systems and it can be improved by further optimization of the structure and the periodic arrangement of meta-atoms such as Fano or toroidal resonant types. 43,44 As for the measurement of solutions having larger THz absorption coefficient, shallowing the channel depth or the reflective arrangement system for reducing the THz absorption into water will be effective. We could also confirm the quantitative measurement of trace amount of liquid solutions by comparing a simple small hole type THz chip.…”

mentioning

confidence: 99%

Invited Article: Terahertz microfluidic chips sensitivity-enhanced with a few arrays of meta-atoms

et al. 2018

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We present a nonlinear optical crystal (NLOC)-based terahertz (THz) microfluidic chip with a few arrays of split ring resonators (SRRs) for ultra-trace and quantitative measurements of liquid solutions. The proposed chip operates on the basis of near-field coupling between the SRRs and a local emission of point like THz source that is generated in the process of optical rectification in NLOCs on a sub-wavelength scale. The liquid solutions flowing inside the microchannel modify the resonance frequency and peak attenuation in the THz transmission spectra. In contrast to conventional bio-sensing with far/near-field THz waves, our technique can be expected to compactify the chip design as well as realize high sensitive near-field measurement of liquid solutions without any high-power optical/THz source, near-field probes, and prisms. Using this chip, we have succeeded in observing the 31.8 fmol of ion concentration in actual amount of 318 pl water solutions from the shift of the resonance frequency. The technique opens the door to microanalysis of biological samples with THz waves and accelerates development of THz lab-on-chip devices.

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Wide‐Angled Pragmatic Dielectric Chiral Meta‐Platform for Spin‐ and Wavelength‐Multiplexed Holography in the Ultraviolet and Visible

Asad,

Seong,

Khaliq

et al. 2024

Adv Funct Materials

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A chiral meta‐optics platform that incorporates hologram‐multiplexing with low phase distortion and wide‐incident angle tolerance over the broad spectral range of the ultraviolet‐visible (UV–vis) regimes holds great potential for photonic‐encryption‐based applications, particularly in next‐generation 3D displays, high‐resolution biomedical imaging, holographic anti‐counterfeiting labeling, and multi‐channel optical communication. However, the design incorporating giant chirality from UV–vis wavelengths coupled with wide‐incident‐angle tolerance and cost‐effective fabrication is still challenging. Here, the study introduces a pragmatic multifunctional dielectric chiral meta‐platform designed for simultaneous spin‐ and wavelength‐multiplexing of optical information in the UV–vis spectrum. The unit cell comprises a dimer structure based on wide‐bandgap silicon nitride (SiNx), ensuring substantial dual‐spectrum chiro‐optical effects. The meticulously engineered chiral meta‐platform offers an incident angle tolerance of up to 40 degrees, coupled with significant chiro‐optical transmission. To demonstrate the concept, two distinct phase profiles are embedded in the meta‐platform, utilizing the spin and wavelength of incident light as keys to unlock the specific holographic information. The chiral meta‐platform is experimentally validated for oblique illumination angles, showcasing its adaptability across the UV–vis spectrum. The demonstrated meta‐device with dual‐spectrum visual encryption can be applied in various anti‐counterfeiting and security applications.

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Sensing with toroidal metamaterial

Cited by 214 publications

References 50 publications

Terahertz Sensing Based on Metasurfaces

Terahertz Sensing Based on Metasurfaces

Invited Article: Terahertz microfluidic chips sensitivity-enhanced with a few arrays of meta-atoms

Wide‐Angled Pragmatic Dielectric Chiral Meta‐Platform for Spin‐ and Wavelength‐Multiplexed Holography in the Ultraviolet and Visible

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