Quadrupole–dipole transform based on optical near-field interactions in engineered nanostructures

Tate, Naoya; Sugiyama, Hiroki; Naruse, Makoto; Nomura, Wataru; Yatsui, Takashi; Kawazoe, Tadashi; Ohtsu, Motoichi

doi:10.1364/oe.17.011113

Cited by 29 publications

(18 citation statements)

References 16 publications

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“…In metamaterials, the near-field coupling between elements supporting different modes, for example, dipole-quadrupole, leads to interesting polarization39 and spectral effects such as electromagnetically induced transparency4041, a situation that resembles the coupling of dipolar QDs to quadrupolar antennas. Similar effects could therefore be explored in the hybrid systems explored here, formed by the combination of quantum-mechanical transitions and plasmon modes.…”

Section: Discussionmentioning

confidence: 99%

Multipolar radiation of quantum emitters with nanowire optical antennas

et al. 2013

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Multipolar transitions other than electric dipoles are generally too weak to be observed at optical frequencies in single quantum emitters. For example, fluorescent molecules and quantum dots have dimensions much smaller than the wavelength of light and therefore emit predominantly as electric dipoles. Here we demonstrate controlled emission of a quantum dot into multipolar radiation through selective coupling to a linear nanowire antenna. The antenna resonance tailors the interaction of the quantum dot with light, effectively creating a hybrid nanoscale source beyond the simple Hertz dipole. Our findings establish a basis for the controlled driving of fundamental modes in nanoantennas and metamaterials, for the understanding of the coupling of quantum emitters to nanophotonic devices such as waveguides and nanolasers, and for the development of innovative quantum nano-optics components with properties not found in nature.

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Section: Discussionmentioning

confidence: 99%

Multipolar radiation of quantum emitters with nanowire optical antennas

et al. 2013

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“…A detailed analysis shows that diamagnetization contribution acquires a position-modified form, and the corresponding rate, as given by Eq. (32), becomes multiplied by a factor of cos 4 kd, where d is the distance from the mirror. In particular, it also emerges that the usually dominant electric-dipole form of interaction (involving the α tensor) is most strongly suppressed at the same location (due to quantum uncertainty the result is not exactly zero).…”

Section: Discussionmentioning

confidence: 99%

“…In consequence, higher-order couplings expressed in multipolar form, such as the light-matter interactions mediated by a magnetic dipole, can usually be disregarded. However, these higher-order terms are important for certain systems, such as chiral discrimination in molecules of low symmetry [1,2], light-harvesting complexes [3], nanomaterials [4][5][6], metamaterials [7,8] and numerous theoretical studies including optical trapping [9][10][11][12][13][14]. Such terms also assume greater significance for systems in which electric-dipole couplings are either very small or vanish altogether-when, for example, a relevant electronic transition is electric-dipole forbidden by symmetry.…”

Section: Introductionmentioning

confidence: 99%

Identifying diamagnetic interactions in scattering and nonlinear optics

Forbes

Andrews

2016

Phys. Rev. A

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In the generic formulation of optical interactions there is, beyond the familiar electric and magnetic multipolar forms of coupling, an additional diamagnetization term that rarely receives attention. In fact it can give rise to effects that should be observable in the general context of nonlinear optical spectroscopy, as well as scattering. A quantum electrodynamical analysis reveals features of special interest in two specific cases: two-photon absorption and Rayleigh scattering. Diamagnetic contributions are seen to be dispersion free with regards to the frequency of input radiation, and can represent unique interactions within optical absorption and emission processes. There is also a configuration in which diamagnetic couplings, which are quadratic in the magnetic field, can supersede those that are dependent linearly on the electric field strength, such as the electric dipole. In this connection the influence of retroreflected circularly polarized light, which leads to a local distance dependence in magnitude of the electromagnetic fields, produces conditions in which the diamagnetization response can become a prominent feature in two-photon absorption.

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“…[1][2][3][4] Recent advances in nanofabrication have further developed plasmonic complexes, allowing for interesting hybridized responses inaccessible by individual elements. [5][6][7][8] In particular, it is well known that a plasmon mode can be either super-or sub-radiant depending on radiative losses, and their coupling gives rise to asymmetric Fano resonance with the steep dispersion. [9][10][11] The quality factor of Fano resonance can be also very high by engineering their coupling strengths, thereby efficiently trapping the incident light into a long-lived sub-radiant mode.…”

Section: Main Textmentioning

confidence: 99%

Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection

Ishikawa

Hara

Tanaka

et al. 2017

Applied Physics Letters

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High-density and long-lived plasmonic hot-spots are an ideal system for high-sensitive surface-enhanced infrared absorption (SEIRA), but these conditions are usually incompatible due to unwanted near-field coupling between the adjacent unit structures. Here, by fully controlling plasmonic interference in a metamaterial lattice, we experimentally demonstrate densely packed long-lived quadrupole plasmons for high-sensitive SEIRA. The metamaterial consists of a strongly coupled array of super- and sub-radiant plasmonic elements to exhibit an electromagnetic transparency mode at 1730 cm−1, which spectrally overlaps with the C=O vibrational mode. In the SEIRA measurement, the C=O mode of poly(methyl methacrylate) molecules is clearly observed as a distinct dip within a transmission peak of the metamaterial. The corresponding numerical simulations reveal that constructive interference uniformly forms coherent quadrupole plasmons over the metamaterial lattice, leading to a stronger molecular signal from the system. Our metamaterial approach provides a robust way to construct ideal hot-spots over the sample, paving the way toward a reliable sensing platform of advanced infrared inspection technologies.

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Quadrupole–dipole transform based on optical near-field interactions in engineered nanostructures

Cited by 29 publications

References 16 publications

Multipolar radiation of quantum emitters with nanowire optical antennas

Multipolar radiation of quantum emitters with nanowire optical antennas

Identifying diamagnetic interactions in scattering and nonlinear optics

Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection

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