A Study of Metal@Graphene Core–Shell Spherical Nano-Geometry to Enhance the SPR Tunability: Influence of Graphene Monolayer Shell Thickness

Bhardwaj, Shivani; Uma, R.; Sharma, R. P.

doi:10.1007/s11468-016-0347-6

Cited by 18 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…where ω is the frequency of the incident light, is relaxation process rate having ≤ 1 meV, μ c is the chemical potential of graphene that lies in approximately 50-1000 meV range and h is reduced Planck's constant. Further, relative permittivity of graphene ε g (ω) can be obtained by coupling of Ohm's law and Maxwell's equation, which is proportional to its complexvalued surface conductivity as follows [18,30]:…”

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%

See 2 more Smart Citations

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

Bhardwaj

Sharma

2018

Bull Mater Sci

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Optical Response Of Graphenementioning

confidence: 99%

Section: Optical Response Of Graphenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Bhardwaj

Sharma

2018

Bull Mater Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…An analogy can be drawn between metal nanoparticles in the optical regime and SiC phonon polariton response within the Reststrahlen band at the MIR range. A few initial studies on SiC-graphene nanoparticles have been published [ 43 , 44 ], but only limited theoretical research was conducted on curved multilayer metal-graphene [ 45 , 46 ] or more general SiC-graphene nanostructures [ 47 , 48 ]. Hence there is a need for further research to investigate MIR characteristics of core-shell SiC-graphene nanoparticles and nanowires, particularly now that a clear path exists to obtain such structures experimentally.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

et al. 2021

View full text Add to dashboard Cite

The mid-infrared (MIR) is an exciting spectral range that also hosts useful molecular vibrational fingerprints. There is a growing interest in nanophotonics operating in this spectral range, and recent advances in plasmonic research are aimed at enhancing MIR infrared nanophotonics. In particular, the design of hybrid plasmonic metasurfaces has emerged as a promising route to realize novel MIR applications. Here we demonstrate a hybrid nanostructure combining graphene and silicon carbide to extend the spectral phonon response of silicon carbide and enable absorption and field enhancement of the MIR photon via the excitation and hybridization of surface plasmon polaritons and surface phonon polaritons. We combine experimental methods and finite element simulations to demonstrate enhanced absorption of MIR photons and the broadening of the spectral resonance of graphene-coated silicon carbide nanowires. We also indicate subwavelength confinement of the MIR photons within a thin oxide layer a few nanometers thick, sandwiched between the graphene and silicon carbide. This intermediate shell layer is characteristically obtained using our graphitization approach and acts as a coupling medium between the core and outer shell of the nanowires.

show abstract

“…The morphology, composition, and structure of the assynthesized graphene@Al spheres were veried by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. In addition, considering that the thickness of the graphene shell can inuence the function of the composite spheres, [20][21][22][23] we also characterized the thickness of the graphene shell on the graphene@Al spheres by creatively using a self-developed non-destructive terahertz wave (THz)-based spectroscopic technique (see the ESI † for details). THz generally refers to the electromagnetic band in the frequency range from 0.1 THz to 10 THz (wavelength from 3 mm to 30 mm), and THz-based material characterization is an emerging eld that has been attracting increasing attention in the material science eld.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel rambutan-like graphene@aluminum composite spheres and non-destructive terahertz characterization

et al. 2019

View full text Add to dashboard Cite

show abstract

A Study of Metal@Graphene Core–Shell Spherical Nano-Geometry to Enhance the SPR Tunability: Influence of Graphene Monolayer Shell Thickness

Cited by 18 publications

References 30 publications

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

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

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

Synthesis of novel rambutan-like graphene@aluminum composite spheres and non-destructive terahertz characterization

Contact Info

Product

Resources

About