Optical Field-Enhancement and Subwavelength Field-Confinement Using Excitonic Nanostructures

Gentile, Martin J.; Núñez-Sánchez, Sara; Barnes, William

doi:10.1021/nl404712t

Cited by 77 publications

(122 citation statements)

References 46 publications

(85 reference statements)

Supporting

Mentioning

103

Contrasting

Order By: Relevance

“…Finally, we note that the SLRs might also arise as a result of exciton rather than plasmonic resonances [24].…”

Section: Discussionmentioning

confidence: 90%

“…The optical response of a metallic nanoparticle may be usefully considered from the perspective of the particle's polarizability, in particular the extinction cross section is easily derived from the polarizability [23,24]. The typical size of the particles in the work reported here was too large (size/λ ∼ 0.1) to allow the simplest approximation for the polarizability, i.e., the quasistatic polarizability, to be used.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plasmonic surface lattice resonances on arrays of different lattice symmetry

2014

View full text Add to dashboard Cite

Arrays of metallic particles may exhibit optical collective excitations known as surface lattice resonances (SLRs). These SLRs occur near the diffraction edge of the array and can be sharper than the plasmon resonance associated with the isolated single particle response. We have fabricated and modeled arrays of silver nanoparticles of different geometries. We show that square, hexagonal, and honeycomb arrays show similar SLRs; no one geometry shows a clear advantage over the others in terms of resonance linewidth. We investigate the nature of the coupling between the particles by looking at rectangular arrays. Our results combine experiment and modeling based on a simple coupled-dipole model.

show abstract

“…Finally, we note that the SLRs might also arise as a result of exciton rather than plasmonic resonances [24].…”

Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Plasmonic surface lattice resonances on arrays of different lattice symmetry

2014

View full text Add to dashboard Cite

show abstract

“…Similar effects are expected for compounds including p-block elements in the near-infrared. 55,56 Interband plasmonic properties in the visible have been evidenced early 57 and re-visited in organic materials, [58][59][60] and have been demonstrated very recently for topological insulators. 61…”

Section: Interband Plasmonics: a New Paradigm In Photonics?mentioning

confidence: 99%

Ultraviolet-visible interband plasmonics with p-block elements

Toudert

Serna

2016

Opt. Mater. Express

View full text Add to dashboard Cite

We investigate the origin of the near-ultraviolet -visible plasmonic properties of three elemental materials from the p-block: Bi, Sb and Ga, with the aim to achieve and exploit unconventional plasmonic effects beyond those provided by noble metals. At such aim, we review and analyze a broad range of optically-determined dielectric functions ε = ε 1 +jε 2 of these elemental materials available in the literature, covering a wide photon energy range (from 0.03 to 24 eV). It is shown that the contribution of Drude-like carriers to ε 1 in the near-ultraviolet -visible is negligible for Bi and Sb and moderate for Ga. In contrast, the interband transitions of these elemental materials show a high oscillator strength that yields a strong negative contribution to ε 1 in the nearultraviolet -visible. Therefore in these materials interband transitions are not a mere damping channel detrimental to plasmonic properties. Remarkably, these interband transitions induce fully (partially) the localized surface plasmon-like resonances taking place in Bi and Sb (Ga) nanostructures in the near-ultraviolet -visible. Plasmonic properties achieved through interband transitions, without Drude-like carrier excitation, are very attractive phenomena because they may give rise to a rich and broad class of nanostructures and metamaterials in which plasmonic effects will be tunable through the tailoring of band structure and by the occupancy of electronic states.

show abstract

“…30 Recently, it has been theoretically shown that a nanosphere of TDBC-doped PVA displays enhanced optical fields and subwavelength field confinement analogously to plasmonic nanoparticles. 31 At present, however, spherical nanoparticles of J-aggregates have not been realized and the synthesis of high-quality nanospheres does not seem readily achievable.…”

mentioning

confidence: 99%

Subdiffraction Light Concentration by J-Aggregate Nanostructures

et al. 2015

View full text Add to dashboard Cite

We show, by accurate scattering calculations, that nanostructures obtained from thin films of J-aggregate dyes, despite their insulating behavior, are able to concentrate the electromagnetic field at optical frequencies like metallic nanoparticles. These results promise to widely enlarge the range of plasmonic materials, thus opening new perspectives in nanophotonics. Specifically we investigate ultrathin nanodisks and nanodisk dimers that can be obtained by standard nanolithography and nanopatterning techniques. These molecular aggregates display highly attractive nonlinear optical properties, which can be exploited for the realization of ultracompact devices for switching by light on the nanoscale without the need of additional nonlinear materials. W hen light interacts with metal nanoparticles and nanostructures, it can excite collective oscillations known as localized surface plasmons (LSPs), which provide the opportunity to confine light to very small dimensions below the diffraction limit. 1−4 This high confinement can lead to a striking near-field enhancement, which can significantly enhance weak nonlinear processes 5 and enables a great variety of applications such as optical sensing, 6,7 higher efficiency solar cells, 8 nanophotonics 1,5,9 including ultracompact lasers and amplifiers, 10 and antennas transmitting and receiving light signals at the nanoscale. 4,11,12 The small mode volume of LSP resonances also increases the photonic local density of states (LDOS) close to a plasmonic nanoparticle, enabling the modification of the optical properties (decay rate and quantum efficiency) of emitters placed in its close proximity (see for example ref 13 and Supporting Information Figure S1). The interaction of quantum emitters, as quantum dots or dye molecules, with individual metallic nanostructures carries significant potential for the quantum control of light at the nanoscale. 1,14−22 As first highlighted by Takahara et al., 23 only materials with a negative real part of the dielectric function and moderate losses are able to excite localized surface plasmons and hence to confine light to very small dimensions below the diffraction limit. These collective and confined excitations are efficiently supported, despite dissipative losses, by noble metals where the effective response of the electrons can be described by a Drude−Lorentz dielectric function whose real part is negative for frequencies below the plasma frequency. 2 Also superconductors or graphene has been proposed as a platform for surface plasmon polaritons. 24,25 Collective oscillations of free electrons are not the only way a negative permittivity may arise. It may also occur in the highenergy tail of a strong absorption resonance. For example, it has been shown that lattice vibrations in polar dielectric materials can also originate negative dielectric permittivity in the far-or mid-infrared spectral range, which can support phononpolaritons confined to the surface. 26,27 It has also been shown

show abstract

Optical Field-Enhancement and Subwavelength Field-Confinement Using Excitonic Nanostructures

Cited by 77 publications

References 46 publications

Plasmonic surface lattice resonances on arrays of different lattice symmetry

Plasmonic surface lattice resonances on arrays of different lattice symmetry

Ultraviolet-visible interband plasmonics with p-block elements

Subdiffraction Light Concentration by J-Aggregate Nanostructures

Contact Info

Product

Resources

About