Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps

Pérez-González, O.; Zabala, Nerea; Aizpurua, Javier

doi:10.1088/1367-2630/13/8/083013

Cited by 53 publications

(76 citation statements)

References 47 publications

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“…Similarly, because of electron tunneling, the QP mode continuously evolves into a higher order charge transfer plasmon mode C2 before direct contact between the nanowires. Thus, already at positive S the nanowires are conductively connected showing characteristic charge transfer plasmon modes [48,[51][52][53]55,56]. For a dimer with a well established conductive contact at negative S, the C1 and C2 modes experience a blue shift with increasing overlap as also found in classical calculations [48,63].…”

Section: Coupled Nanowiressupporting

confidence: 63%

“…The nanoparticles thus appear conductively connected prior to direct contact, and the transition between the non-touching and conductive contact regimes is continuous. In particular, the charge transfer plasmon associated with interparticle charge transfer [51][52][53][54][55][56][57] progressively emerges in the optical response of the system, as has been fully confirmed in recent experiments [28,29]. These quantum effects can be reproduced with the Quantum Corrected Model (QCM) [33] that treats the junction between the nanoparticles as an effective medium mimicking quantum effects within the classical local Maxwell theory [28,29].…”

Section: Introductionmentioning

confidence: 66%

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Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

et al. 2013

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Abstract:Using a fully quantum mechanical approach we study the optical response of a strongly coupled metallic nanowire dimer for variable separation widths of the junction between the nanowires. The translational invariance of the system allows to apply the time-dependent density functional theory (TDDFT) for nanowires of diameters up to 10 nm which is the largest size considered so far in quantum modeling of plasmonic dimers. By performing a detailed analysis of the optical extinction, induced charge densities, and near fields, we reveal the major nonlocal quantum effects determining the plasmonic modes and field enhancement in the system. These effects consist mainly of electron tunneling between the nanowires at small junction widths and dynamical screening. The TDDFT results are compared with results from classical electromagnetic calculations based on the local Drude and non-local hydrodynamic descriptions of the nanowire permittivity, as well as with results from a recently developed quantum corrected model. The latter provides a way to include quantum mechanical effects such as electron tunneling in standard classical electromagnetic simulations. We show that the TDDFT results can be thus retrieved semi-quantitatively within a classical framework. We also discuss the shortcomings of classical non-local hydrodynamic approaches. Finally, the implications of the actual position of the screening charge density at the gap interfaces are discussed in connection with plasmon ruler applications at subnanometric distances. References and links 1. L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, "The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment," J. Phys. Chem. B 107, 668-667 (2003 B 48, 18178-18188 (1993). 68. P. Apell, and D. R. Penn, "Optical properties of small metal spheres: surface effects," Phys. Rev. Lett. 50, 1316Lett. 50, -1319Lett. 50, (1983. 69. J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, "Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters," Phys. Rev. Lett. 80, 45-48 (1998 B 52, 14219-14234 (1995). 81. L. Serra, and A. Rubio, "Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory," Phys. Rev. Lett. 78, 1428Lett. 78, -1431Lett. 78, (1997. 82. E. Prodan, P. Nordlander, and N. J. Halas, "Electronic structure and optical properties of Gold nanoshells," Nano Lett. 3, 1411Lett. 3, -1415Lett. 3, (2003. 83. E. Prodan, P. Nordlander, and N. J. Halas, "Effects of dielectric screening on the optical properties of metallic nanoshells," Chem. Phys. Lett. 368, 94-101 (2003). 84. K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, "Multipole plasmon modes at a metal surface," Phys. Rev. Lett. 64, 44-47 (1990). 85. A. J. Bennett, "Influence of the electron charge distribution on surface-plasmon dispersion," Phys. 80, 5105-5108 (1998). 88. S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, "Observation of intrinsic si...

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Section: Coupled Nanowiressupporting

confidence: 63%

Section: Introductionmentioning

confidence: 66%

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

et al. 2013

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“…For this reason, this longitudinal D mode has recently been termed the charge transfer plasmon mode in the context of close touching metallic nanoparticles. [20][21][22][23] Importantly, Figure 2 (a) demonstrates that, as predicted theoretically, [ 6 , 16 ] the effect of the D mode is to effectively broaden the ACS, leading to greater absorption at lower frequencies. Figure 2 (c) shows that, similarly to the longitudinal D-D mode, this resonance yields a strong ( ∼ 130 fold) fi eld enhancement in the narrow gap separating the two disks, above the contact point.…”

Section: Doi: 101002/adma201202003supporting

confidence: 61%

Broadband Terahertz Plasmonic Response of Touching InSb Disks

et al. 2012

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The plasmonic behavior of dimers of touching semiconductor disks is studied experimentally in the difficult‐to‐realize regime where the disks are only marginally overlapping. Previous theoretical studies have shown that this geometry exhibits a highly efficient broadband response that may be very promising for light harvesting and sensing applications. By taking advantage of the plasmonic character of InSb in the terahertz regime, we experimentally confirm this broadband response and describe the associated strong field enhancement and sub‐micrometer field confinement between the disks.

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“…This BDP mode presents strongly localised charge densities of opposite sign and enormously enhanced local electromagnetic fields at the cavity. In contrast, when a conductive path is established between both particles of the dimer, a Charge Transfer Plasmon (CTP) mode is allowed, with current density crossing through the cavity, involving an oscillating distribution of net charge at every individual nanoparticle [13,14,17,18]. In most of the studies dealing with these effects, classical electrodynamical approaches have been applied.…”

Section: Introductionmentioning

confidence: 99%

Optical transport and sensing in plexcitonic nanocavities

2013

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We present a theoretical study of the optical properties of a strongly coupled metallic dimer when an ensemble of molecules is placed in the inter-particle cavity. The linking molecules are characterized by an excitonic transition which couples to the Bonding Dimer Plasmon (BDP) and the Bonding Quadrupolar Plasmon (BQP) resonances, arising from the hybridization of the dipolar and quadrupolar modes of the individual nanoparticles, respectively. As a consequence, both modes split into two coupled plasmon-exciton modes, so called plexcitons. The Charge Transfer Plasmon (CTP) resonance, involving plasmonic oscillations of the dimer as a whole, arises when the conductance of the excitonic junction is above a threshold value. The possibility of exploiting plexcitonic resonances for sensing is explored in detail. We find high sensitivity to the environment when different dielectric embedding media are considered. Contrary to standard methods, we propose a new framework for effective sensing based on the relative intensity of plexcitonic peaks.

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Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps

Cited by 53 publications

References 47 publications

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

Broadband Terahertz Plasmonic Response of Touching InSb Disks

Optical transport and sensing in plexcitonic nanocavities

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