Tunable Properties of Surface Plasmon Resonance of Metal Nanospheroid: Graphene Plasmon Interaction

Bhardwaj, Shivani; Pathak, Nilesh Kumar; Ji, Alok; Uma, R.; Sharma, R. P.

doi:10.1007/s11468-016-0249-7

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…The optical responses of the graphene are described by the Kubo formula in terms of the complex-valued surface conductivity [21][22][23]. The frequency-dependent surface conductivity of graphene can be quantitatively described by the summation of intra-conductivity (σ intra ) and inter-conductivity (σ inter ) and expressed as [5,6,24]…”

Section: Optical Modeling Of Graphenementioning

confidence: 99%

“…So we have selected ASR = 0.4 to see the enhancement in the number of absorbed photons at AM 1.5 G solar spectrum utilizing the ultra-thin silicon wafer as shown in figure 9(a), which is estimated in equation (11). The number of photon absorption N ab in the presence of the Ag NPs under the influence of a GML surrounding environment can be written as [1,5,28]…”

Section: Spectral Response and J-v Analysismentioning

confidence: 99%

“…The dielectric medium around metal nanoparticles (NPs) can be modified by embedding them in a different medium or by placing them on a substrate or dielectric layer coated substrate. Nowadays, graphene monolayers (GMLs) are widely used as either a spacer layer or as a shell due to their fascinating optical and electrical properties [5][6][7][8]. Graphene can also be used to make a Schottky junction with Si by using proper design architecture.…”

Section: Introductionmentioning

confidence: 99%

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Mediating broadband light into graphene–silicon Schottky photodiodes by asymmetric silver nanospheroids: effect of shape anisotropy

Bhardwaj¹,

Parashar²,

Roopak³

et al. 2018

J. Phys. D: Appl. Phys.

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Designing thinner, more efficient and cost-effective 2D materials/silicon Schottky photodiodes using the plasmonic concept is one of the most recent quests for the photovoltaic research community. This work demonstrates the enhanced performance of graphene–Si Schottky junction solar cells by introducing asymmetric spheroidal shaped Ag nanoparticles (NPs) embedded in a graphene monolayer (GML). The optical signatures of these Ag NPs (oblate, ortho-oblate, prolate and ortho-prolate) have been analyzed by discrete dipole approximation in terms of extinction efficiency and surface plasmon resonance tunability, against the quasi-static approximation. The spatial field distribution is enhanced by optimizing the size (aeff = 100 nm) and aspect ratio (0.4) for all of the utilized Ag NPs with an optimized graphene environment (t = 0.1 nm). An improvement of photon absorption in the thin Si wafer for the polychromatic spectral region (λ ~ 300–1100 nm) under an AM 1.5 G solar spectrum has been observed. This resulted in a photocurrent enhancement from 7.98 mA cm−2 to 10.0 mA cm−2 for oblate-shaped NPs integrated into GML/Si Schottky junction solar cells as compared to the bare cell. The structure used in this study to improve the graphene–Si Schottky junction’s performance is also advantageous for other graphene-like 2D material-based Schottky devices.

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Section: Optical Modeling Of Graphenementioning

confidence: 99%

Section: Spectral Response and J-v Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mediating broadband light into graphene–silicon Schottky photodiodes by asymmetric silver nanospheroids: effect of shape anisotropy

Bhardwaj¹,

Parashar²,

Roopak³

et al. 2018

J. Phys. D: Appl. Phys.

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“…The frequency-dependent complex-valued surface conductivity of graphene depends on its intra-conductivity σ intra and inter-conductivity σ inter . The dynamic surface conductivity can be quantitatively described as [17,18,21] σ…”

Section: Optical Response Of Graphenementioning

confidence: 99%

“…To increase the efficiency of the photovoltaic devices, many of the researchers have used different surrounding environments of MNPs. Nowadays, graphene monolayer (GML) is widely used as a spacer, substrate, coating material and surrounding environment in the solar cell devices due to its fascinating optical and electrical properties [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Improving range of SPR tunability and extinction efficiency of spheroidal silver nanostructures in graphene environment

Bhardwaj

Sharma

2018

Bull Mater Sci

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In photovoltaics, the materials having ability to manipulate the optical fields and coupling of energy flow inside the device play a crucial role. In this article, we report the role of graphene environment on spheroid-shaped Ag nanoparticles (NPs) with various shapes and sizes. This study confirms the tunability of surface plasmon resonances (SPRs) and an enhancement in extinction efficiency, derived numerically using discrete dipole approximation (DDA). We have chosen oblate-and prolate-shaped Ag NPs for the numerical experiment and analysed their optical signatures in terms of extinction efficiency and SPR tunability against the quasi-static approximation. The excitation of longitudinal and transversal resonances was also observed because of the asymmetric shape of Ag NPs. All optical responses have been analysed by varying the effective radii and aspect ratio of Ag NPs, and the thickness of graphene monolayer (from 0.1 to 0.5 nm). Tunability of longitudinal resonances has been observed in the 600-833 nm wavelength region, while for transversal resonances, the tunability is in the 450-505 nm wavelength range. The results represent the effect of graphene environment on the tunability of SPRs with enhanced extinction efficiency. This study could lead to the development of a photovoltaic device with wide range of tunability and enhanced efficiency.

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Optical Sensitive Detection of Cervical Cancer Based on Surface Plasmon Resonance Nanostructure

Daher,

Trabelsi,

Rashed

et al. 2024

Physica Status Solidi (a)

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Cervical cancer is a disease that affects a lot of people all over the world. The success of treatment is significantly increased by early detection. The new surface plasmon resonance sensor (SPRS) described in this article is constructed from layers of silver, BaTiO3, and graphene, as well as a coupling prism. The transfer matrix (TM) approach is used to evaluate the SPRS structure. To obtain the highest sensitivity of the suggested SPRS, the thicknesses of the Ag and BaTiO3 and the number of Gr sheets are evaluated. Investigations are done on all factors of performance of the proposed device. Exemplary efficiency is achieved using 4 nm (BaTiO3) and 60 nm (Ag) materials. Three layers are chosen as the optimal amount of graphene after investigation. When the optimal thicknesses are employed, the suggested SPRS's greatest sensitivity of 300° RIU−1 has been attained. The suggested SPRS displays better sensitivity when compared to SPRS structures that have already been published in the literature. This SPRS is promising to be used in different biosensing applications due to its high performance.

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Tunable Properties of Surface Plasmon Resonance of Metal Nanospheroid: Graphene Plasmon Interaction

Cited by 9 publications

References 38 publications

Mediating broadband light into graphene–silicon Schottky photodiodes by asymmetric silver nanospheroids: effect of shape anisotropy

Mediating broadband light into graphene–silicon Schottky photodiodes by asymmetric silver nanospheroids: effect of shape anisotropy

Improving range of SPR tunability and extinction efficiency of spheroidal silver nanostructures in graphene environment

Optical Sensitive Detection of Cervical Cancer Based on Surface Plasmon Resonance Nanostructure

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