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Journals >Chinese Optics Letters >Volume 19 >Issue 12 >Page 123603 > Article

Chinese Optics Letters
Vol. 19, Issue 12, 123603 (2021)

Metallic nanoparticles/graphene-molecules hybrid system-based active biosensor

Walid Aroua^*

Author Affiliations

National Institute of Applied Sciences and Technology, Carthage University, 1080 Tunis, Tunisia

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DOI: 10.3788/COL202119.123603 Cite this Article Set citation alerts

Walid Aroua. Metallic nanoparticles/graphene-molecules hybrid system-based active biosensor[J]. Chinese Optics Letters, 2021, 19(12): 123603 Copy Citation Text

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Abstract

The strong coupling between vibrational modes of molecules and surface plasmon resonance (SPR) modes in graphene makes them an ideal platform for biosensor techniques. In this paper, a new optical biosensor for molecule detection based on silver metallic nanoparticles (MNPs) and graphene/gold MNPs in a terahertz frequency range is achieved. It is established that the nonlinear electrical properties of graphene can play a major role in realizing a biosensor for molecule detection. The performance parameters of the proposed device are reported with respect to the chemical potential

μ

of graphene, noting that the sensitivity of our device passes from 255 nm/RIU (nanometers/refractive index unit) for

μ = 1.21 eV

to 2753 nm/RIU for

μ = 0.21 eV

. Finally, this structure exhibits an optical sensing region that can be adjusted to meet the requirements of optical detection.

Keywords

biosensor graphene plasmon resonance vibrational modes of molecules

σ = \frac{e^{2}}{4 ℏ} (\frac{1}{2} + \frac{1}{π} \arctan (\frac{ℏ ω - 2 μ}{2 K_{B} T}) - \frac{i}{2 π} \ln (\frac{{(ℏ ω + 2 μ)}^{2}}{{(ℏ ω - 2 μ)}^{2} + {(2 K_{B} T)}^{2}})) + \frac{2 i e^{2} K_{B} T}{π ℏ^{2} (ω + \frac{i}{τ})} \ln (2 \cosh (\frac{μ}{2 K_{B} T})) - \frac{i 9 v_{f}^{2} e^{4}}{8 μ π ℏ^{2} ω^{3}} {| E |}^{2},

(1)

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ε = 1 + i \frac{σ}{ε_{0} ω d},

(2)

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ε_{h s} = ε^{'} + i ε^{″} = ε + δ ε,

(3)

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δ ε = \frac{12 α_{m} S}{3 - 4 π α_{m} S},

(4)

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α_{m} = \frac{β}{{(ℏ ω_{m})}^{2} - {(ℏ ω)}^{2} - i ℏ^{2} ω γ_{m}},

(5)

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P_{i} = α_{i} E_{i} + α_{i} \sum G_{i j} P_{j},

(6)

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G_{i j} = \frac{(k^{2} + ε_{h s}^{- 1} \nabla \nabla) e^{(i k | r_{i} - r_{j} |)}}{| r_{i} - r_{j} |} .

(7)

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P (ω) = P_{l} (ω) + P_{nl} (ω),

(8)

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P_{nl} (ω) = ε_{h s} χ^{3} | E_{ω} | {| E_{ω} |}^{2},

(9)

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P_{i} (ω : ω, ω, ω) = α_{i} E_{i} (ω) + ε_{h s} χ^{3} | E_{i} (ω) | {| E_{i} (ω) |}^{2} + α_{i} \sum G_{i j} P_{j} .

(10)

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E_{end} = \frac{k^{2}}{ε_{h s}} G_{i j} P_{end},

(11)

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P_{i} (ω : ω, ω, ω) = ε_{h s} χ^{3} | E_{A} (ω) | {| E_{A} (ω) |}^{2} + α_{i} \sum (G_{i j} + G_{int}) P_{j},

(12)

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References (34)

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Walid Aroua. Metallic nanoparticles/graphene-molecules hybrid system-based active biosensor[J]. Chinese Optics Letters, 2021, 19(12): 123603

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