Nanoring structure, spacing, and local dielectric sensitivity for plasmonic resonances in Fano resonant square lattices

Forcherio, Gregory T.; Blake, Phillip; DeJarnette, Drew; Roper, D. Keith

doi:10.1364/oe.22.017791

Cited by 31 publications

(30 citation statements)

References 41 publications

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“…Each point dipole within a target was assigned a polarizability, α di , according to the "lattice dispersion relation" described by Gutkowicz-Krusin [48] to permit calculation of its polarization P di in response to E o . DDSCAT was modified to output complex effective polarizability, α ef f , for each AuNS-substrate pair by summing the polarizability of each dipole within the target [7,42], calculated as a function of the inter-dipole spacing (d di ), P di for the i th dipole per unit volume, and E o at the i th dipole:…”

Section: Numerical Modelingmentioning

confidence: 99%

“…Computed polarizabilities were then used to calculate far-field lattice spectra from square 301 Â 301 arrays of AuNS using rsa-CDA [7,42]. The rsa-CDA [20,38,40] reduced computational time by taking advantage of π/2 rotational symmetry in square lattices [40].…”

Section: Numerical Modelingmentioning

confidence: 99%

“…A compact description of localized and coupled resonant modes due to polarization of ordered nanoantennas in complex, discontinuous dielectric environments is needed for energy harvesting [4,5], sensors [6,7], photonic circuits [8,9], and nonlinear optics [10,11]. This calls for a multi-scale, electrodynamic approach beyond dielectric averaging, analytic approximations, or present computational methods.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coupled dipole plasmonics of nanoantennas in discontinuous, complex dielectric environments

Forcherio

Blake

Seeram

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tTwo-dimensional metamaterials support both plasmonic and coupled lattice (Fano) resonant modes that together could enhance optoelectronics. Descriptions for plasmon excitation in Fano resonant lattices in non-vacuum environments typically use idealized, homogeneous matrices due to computational expense and limitations of common approaches. This work described both localized and coupled resonance activity of twodimensional, square lattices of gold (Au) nanospheres (NS) in discontinuous, complex dielectric media using compact synthesis of discrete and coupled dipole approximations. This multi-scale approach supported attribution of experimentally observed spectral resonance energy and bandwidth to interactions between metal and dielectric substrate (s) supporting the lattices. Effective polarizabilities of single AuNS, either in vacuo or supported by glass and/or indium tin oxide (ITO) substrates, were obtained with discrete dipole approximation (DDA). This showed plasmon energy transport varied with type of substrate: glass increased scattering, while ITO increased absorption and energy confinement. Far-field lattice interactions between AuNS with/without substrates were computed by coupled dipole approximation (CDA) using effective polarizabilities. This showed glass enhanced diffractive features (e.g., coupled lattice resonance), while ITO supported plasmon modes. This compact, multiscale approach to describe metasurfaces in complex environments could accelerate their development and application.

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Section: Numerical Modelingmentioning

confidence: 99%

Section: Numerical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupled dipole plasmonics of nanoantennas in discontinuous, complex dielectric environments

Forcherio

Blake

Seeram

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Thus, the near electric field intensity of these LSPR peaks is enhanced for the peaks are modulated by lattice diffraction effect. In this work, though the lattice resonance peaks 25,26 do not appear, the lattice diffraction enhanced LSPR peaks emerge, when the LSPRPW matches the effective lattice constant of the array.…”

Section: Discussion a The Lattice Diffraction Enhanced Lspr Peaksmentioning

confidence: 73%

“…All Simulation results indicate that all considered MENR arrays exhibit a strong bonding mode LSPR peak under both longitudinal and transverse polarizations in the near-infrared region, but lattice resonance peaks stemming from the diffractive coupling Fano resonance 25,26 do not emerge. Fig.…”

Section: Calculation Resultsmentioning

confidence: 92%

The local surface plasmon resonance property and refractive index sensitivity of metal elliptical nano-ring arrays

Lin

Wang

et al. 2014

AIP Advances

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In this paper, we systematically investigate the optical property and refractive index sensitivity (RIS) of metal elliptical nano-ring (MENR) arranged in rectangle lattice by finite-difference time-domain method. Eight kinds of considered MENRs are divided into three classes, namely fixed at the same outer size, at the same inner size, and at the same middle size. All MENR arrays show a bonding mode local surface plasmon resonance (LSPR) peak in the near-infrared region under longitudinal and transverse polarizations, and lattice diffraction enhanced LSPR peaks emerge, when the LSPR peak wavelength (LSPRPW) matches the effective lattice constant of the array. The LSPRPW is determined by the charge moving path length, the parallel and cross interactions induced by the stable distributed charges, and the moving charges inter-attraction. High RIS can be achieved by small particle distance arrays composed of MENRs with big inner size and small ring-width. On the other hand, for a MENR array, the comprehensive RIS (including RIS and figure of merit) under transverse polarization is superior to that under longitudinal polarization. Furthermore, on condition that compared arrays are fixed at the same lattice constant, the phenomenon that the RIS of big ring-width MENR arrays may be higher than that of small ring-width MENR arrays only appears in the case of compared arrays with relatively small lattice constant and composed of MENRs fixed at the same inner size simultaneously. Meanwhile, the LSPRPW of the former MENR arrays is also larger than that of the latter MENR arrays. Our systematic results may help experimentalists work with this type of systems.

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Spectral Characteristics of Noble Metal Nanoparticle–Molybdenum Disulfide Heterostructures

Forcherio

Roper

2016

Advanced Optical Materials

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near-fi elds and optical absorption [29][30][31] to improve light emission from MoS 2 despite plasmon-phonon coupling, [ 32 ] hot electron transport, [ 33 ] and recombination limitations. Gold (Au) nanoparticle-induced electric fi elds were reported to increase photoluminescence (PL) of MoS 2 1.7-to 2-fold [ 16,34 ] and tungsten disulfi de (WS 2 ) 10-fold. [ 35 ] In the latter, plasmon-exciton coupling had been maximized. Quenching of PL from MoS 2 by p-type doping was reported to result from smaller MoS 2 electron affi nity than the Au work function. [ 36 ] Development of compact models that attribute plasmon-phonon coupling and hot electron transport to heterostructure composition, geometry, and arrangement has, to date, lagged experimental characterization.This work introduced use of the discrete dipole approximation (DDA) to Maxwell's equations to characterize excitation and damping of plasmon and exciton modes in near-fi eld maps and far-fi eld transmission UV-vis spectra of MoS 2 decorated with Au nanospheres (AuNS) and silver nanoprisms (AgNP). DDA simulations of heterostructures exhibited features corresponding to localized surface plasmon resonance (LSPR) and to A and B exciton transitions of the semiconductor, and exhibited modulation of these features by a silica substrate. MoS 2 -induced red-shifts of LSPR wavelengths were estimated within 2% of measured spectra. Near-fi eld energy maps at the nanoparticle-MoS 2 interface showed nanoparticle plasmon energy dissipated to the MoS 2 via plasmon damping and direct bandgap excitation. Linewidth analysis of plasmon damping was used to characterize energy transfer, including putative hot electron transfer, enabled by excitation above the ca. 0.9 eV Schottky barrier [ 37 ] for Au-MoS 2 interfaces. Results indicate DDA simulation could guide design of plasmon-exciton interactions in nanoparticle-decorated transition metal dichalcogenides (TMD) beyond MoS 2 , based on an available measured or simulated dielectric function. Results and Discussion Sample Characterization and MethodsAuNS (76 ± 13 nm diameter) and AgNP (53 ± 19 nm edge length) were drop-cast [ 38 ] onto monolayer MoS 2 -covered silica glass and characterized using a bright-fi eld optical microscope (Eclipse LV100; Nikon Instruments, Melville, NY, USA) with Energy and damping of resonances which occur in spectra of monolayer molybdenum disulfi de (MoS 2 ) decorated by noble metal nanospheres and prisms are examined by comparing discrete dipole approximation (DDA) simulations and transmission UV-vis measurements. Localized surface plasmon resonance (LSPR) as well as A and B exciton transitions of the semiconductor are characterized individually and in tandem on a silica substrate. Extinction energies for LSPR and direct bandgap transition of MoS 2 estimated by DDA are within 2% of measured values for gold nanospheres and silver nanoprisms. Resonant near-fi elds mapped at nanoparticle-MoS 2 interfaces show plasmon damping via energy dissipation to the MoS 2 and direct bandgap excitation. Linewidth ana...

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Nanoring structure, spacing, and local dielectric sensitivity for plasmonic resonances in Fano resonant square lattices

Cited by 31 publications

References 41 publications

Coupled dipole plasmonics of nanoantennas in discontinuous, complex dielectric environments

Coupled dipole plasmonics of nanoantennas in discontinuous, complex dielectric environments

The local surface plasmon resonance property and refractive index sensitivity of metal elliptical nano-ring arrays

Spectral Characteristics of Noble Metal Nanoparticle–Molybdenum Disulfide Heterostructures

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