Terahertz gas sensor based on absorption-induced transparency

Rodrigo, Sergio G.

doi:10.1051/epjam/2016013

Cited by 5 publications

(6 citation statements)

References 41 publications

(59 reference statements)

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“…The reflected light is spectrally analyzed for gas signatures. The gas dielectric function is assumed to follow a Lorentzian form with frequency, ω within the spectral window of interest [36,37]:…”

Section: Trapping Moleculesmentioning

confidence: 99%

Plasmonic Gas Sensing with Graphene Nanoribbons

Khaliji

Biswas

et al. 2020

Phys. Rev. Applied

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The main challenge to exploiting plasmons for gas vibrational mode sensing is the extremely weak infrared absorption of gas species. In this work, we explore the possibility of trapping free gas molecules via surface adsorption, optical, or electrostatic fields to enhance gas-plasmon interactions and to increase plasmon sensing ability. We discuss the relative strengths of these trapping forces and found gas adsorption in a typical nanoribbon array plasmonic setup produces measurable dips in optical extinction of magnitude 0.1 % for gas concentration of about parts per thousand level.

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Section: Trapping Moleculesmentioning

confidence: 99%

Plasmonic Gas Sensing with Graphene Nanoribbons

Khaliji

Biswas

et al. 2020

Phys. Rev. Applied

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“…The optical response of graphene is described using the Drude model. [10] The dielectric function of gas is assumed to follow a Lorentzian form, which is the function of frequency ω in the mid-infrared range: [11] , --1…”

Section: Graphene Nanoribbon Device For Gas Sensingmentioning

confidence: 99%

“…Δε=p0C , [6,12] with the proportionality constant p0=10cm 3 /mol. [11] And the representative gas parameters γ=0.025Ω, [6] the representative gas position Ω is dependent on the detected gas molecules. Accordingly, the dielectric function of gas molecular can be tuned by its concentration in the gas chamber.…”

Section: Graphene Nanoribbon Device For Gas Sensingmentioning

confidence: 99%

“…The effective adsorbed gas molecule concentration Ceff = DadC, where Dad depends on the binding energy of the gas molecule-graphene system and Dad is set to 500 in this simulation. [11] In the meanwhile, Fermi level of graphene, which is in direct with gas molecules, is doped through adsorption charge transfer. While the molecules distributed with concentration Ceff in a layer of thickness dgas are effectively assimilated to a surface conductivity:…”

Section: Graphene Nanoribbon Device For Gas Sensingmentioning

confidence: 99%

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The mechanism study of highly sensitive gas sensing based on double-layer graphene plasmons

Chi

Wang

Zhao

2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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The gas sensing based on graphene plasmons enhanced infrared absorption has the advantages of label-free identification of gas molecules, low loss and tunability. However, the optical field confinement of graphene plasmons is much smaller than distribution range of gas molecules, resulting in weak interaction between graphene plasmons and gas molecules. It is difficult to significantly improve the sensitivity of gas sensing. A gas sensor based on double-layer graphene nanoribbons with enhanced plasmons is proposed to improve the near-field coupling between highly confined field and gas molecules. Meanwhile, the influence mechanism of trapping free-gas molecules via surface adsorption is explored on increasing the sensitivity of gas sensing. The results show that the vibrational absorption enhancement of gas molecules based on double-layer graphene nanoribbons is improved by at least an order of magnitude than the single-layer graphene. The surface adsorption by graphene which tunes the gas concentration close to graphene can change the mode weight of vibrational mode to improve the sensitivity further. This study provides an important theoretical basis for designing and preparing gas sensor based on two-dimensional materials plasmons enhanced infrared absorption, and promotes the development of highly sensitive and integrated gas sensing system.

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“…Apart from a few studies focused on fundamental aspects of light-matter interactions [13] or on the detection of gases in the THz regime [14], AIT has been elusive in many experiments. Let us say that only a few experiments in strong coupling found effects ascribed to AIT [15], while many others did not do, although they were conducted for similar conditions of filling/covering [16,17].…”

Section: Introductionmentioning

confidence: 99%

Amplification of light scattering in arrays of nanoholes by plasmonic absorption-induced transparency

Rodrigo

2021

Preprint

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Absorption induced transparency is an optical phenomenon that occurs in metallic arrays of nanoholes when materials featuring narrow lines in their absorption spectra are deposited on top of it. First reported in the visible range, using dye lasers as cover materials, it has been described as transmission peaks unexpectedly close to the absorption energies of the dye laser. In this work, amplification of light is demonstrated in the active regime of absorption induced transparency. Amplification of stimulated emission can be achieved when the dye laser behaves as a gain material. Intense illumination can modify the dielectric constant of the gain material, which in turn, changes the propagation properties of the plasmonic modes excited in the hole arrays, providing both less damping to light and further feedback, enhancing the stimulated emission process.

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Terahertz gas sensor based on absorption-induced transparency

Cited by 5 publications

References 41 publications

Plasmonic Gas Sensing with Graphene Nanoribbons

Plasmonic Gas Sensing with Graphene Nanoribbons

The mechanism study of highly sensitive gas sensing based on double-layer graphene plasmons

Amplification of light scattering in arrays of nanoholes by plasmonic absorption-induced transparency

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