Antenna–Cavity Hybrids: Matching Polar Opposites for Purcell Enhancements at Any Linewidth

Doeleman, Hugo M.; Verhagen, Ewold; Koenderink, A. Femius

doi:10.1021/acsphotonics.6b00453

Cited by 120 publications

(176 citation statements)

References 65 publications

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“…Despite of these efforts, the nonradiative decay from the dipolar plasmonic modes remains serious for small metallic nanostructures which are advantageous for stronger light-matter interaction due to more confined fields [11]. Here we provide the perspective of microcavity-engineered metallic nanostructure system, which is not revealed in previous studies of the hybrid photonic-plasmonic modes [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. The microcavity engineers electromagnetic environment of dipolar plasmonic mode, enhancing its radiation rate and further reducing the Ohmic absorption.…”

mentioning

confidence: 99%

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Peng

Liu²,

et al. 2017

Phys. Rev. Lett.

130

129

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Localized-surface plasmon resonance is of importance in both fundamental and applied physics for the subwavelength confinement of optical field, but realization of quantum coherent processes is confronted with challenges due to strong dissipation. Here we propose to engineer the electromagnetic environment of metallic nanoparticles (MNPs) using optical microcavities. An analytical quantum model is built to describe the MNP-microcavity interaction, revealing the significantly enhanced dipolar radiation and consequentially reduced Ohmic dissipation of the plasmonic modes. As a result, when interacting with a quantum emitter, the microcavity-engineered MNP enhances the quantum yield over 40 folds and the radiative power over one order of magnitude. Moreover, the system can enter the strong coupling regime of cavity quantum electrodynamics, providing a promising platform for the study of plasmonic quantum electrodynamics, quantum information processing, precise sensing and spectroscopy.Metallic nanostructures confine light on the subwavelength scale due to the collective excitation of electrons known as localized-surface plasmon resonances (LSPRs). Ultrasmall mode volumes of the plasmonic resonances down to cubic nanometers make them a powerful platform for fundamental studies and novel applications, such as spaser [1,2], superlens [3] and quantum plasmonics [4,5]. An emerging field is to study the nanoscale light-matter interaction between plasmonic mode and few or even single quantum emitters (e.g., atoms, molecules or quantum dots, etc). For example, in the weak coupling regime LSPRs are widely used to enhance fluorescence [6][7][8] and Raman scattering [9][10][11] and to achieve unidirectional emission [12]; in the strong coupling regime the coherent hybridizations between plasmonic resonances and quantum emitters have also been investigated both theoretically [13][14][15][16][17][18] and experimentally [19][20][21][22][23][24][25].Two approaches have been taken to achieve singleemitter strong coupling -lowering the mode volumes and suppressing the dissipation. The former typically requires ultra-fine geometries with nanometer or even subnanometer precision [20,25], posing challenges on fabricating metallic structures and positioning individual quantum emitters. For the latter, the dipolar plasmonic modes dissipates through both radiation and Ohmic absorption, while the multipole modes are purely absorptive [26]. A better coherence can be achieved by reducing the excitation of multipole modes or enhancing the excitation of dipolar modes. Thus, efforts have been made to tailor the geometry of the metallic nanostructures, for example, elongating a metallic nanoparticle (MNP) to separate the dipolar and multipole resonances [27], and forming dimer or arrays to obtain stronger coupling of a certain dipolar mode [28]. An alternative approach is cancelling the coupling between the emitters and the multipole modes with emitters homogeneously distributed around the metallic structure [29]. Despite of these efforts, the ...

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mentioning

confidence: 99%

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Peng

Liu²,

et al. 2017

Phys. Rev. Lett.

130

129

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“…Such interactions may allow one to study optomechanics in the regime of cavity-quantum electrodynamics (cavity-QED), which requires both the cavity mode and the vibrational mode to be treated quantum mechanically, and without adiabatic elimination. On the other hand, hybrid plasmonic devices, consisting of dielectric and metal parts, can offer extra design flexibility in terms of the resonance line shapes and cavity mode properties [24][25][26][27][28] . Although these hybrid systems involve a more complex coupling than simple MNPs or dielectric cavities, they can be advantageous for quantum plasmonics, as we will demonstrate below.…”

Section: Introductionmentioning

confidence: 99%

Molecular Optomechanics in the Anharmonic Cavity-QED Regime Using Hybrid Metal–Dielectric Cavity Modes

2019

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Using carefully designed hybrid metal-dielectric resonators, we study molecular optomechanics in the strong coupling regime (g 2 /ωm>κ), which manifests in anharmonic emission lines in the sideband-resolved region of the cavity-emitted spectrum (κ<ωm). This optomechanical strong coupling regime is enabled through a metal-dielectric cavity system that yields not only deep subwavelength plasmonic confinement, but also dielectric-like confinement rates that are more than two orders of magnitude smaller than those from typical plasmonic modes. The classical mode parameters are quantified using quasinormal mode theory, and the quantum dynamics are computed using both standard and generalized quantum master equations. These hybrid metal-dielectic cavity modes enables one to study new avenues of multi-photon quantum plasmonics through surface enhanced Raman spectroscopy, and is also well into the ultrastrong coupling regime (g/ωm>0.1). arXiv:1805.10153v2 [cond-mat.mes-hall]

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“…Plasmonic or highindex dielectric nanoparticles are frequently used for this purpose 1,2 . The multipole expansion provides insight into several optical phenomena, such as Fano resonances 3,4 , electromagnetically-induced-transparency 5 , directional light emission [6][7][8][9] , manipulating and controlling spontaneous emission [10][11][12] , light perfect absorption [13][14][15] , electromagnetic cloaking 16,17 , and optical (pulling, pushing, and lateral) forces [18][19][20][21][22] . In all these cases, an external field induces displacement or conductive currents into the samples.…”

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confidence: 99%

An electromagnetic multipole expansion beyond the long-wavelength approximation

Alaee

Rockstuhl

Fernandez‐Corbaton

2018

Optics Communications

348

313

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The multipole expansion is a key tool in the study of light-matter interactions. All the information about the radiation of and coupling to electromagnetic fields of a given charge-density distribution is condensed into few numbers: The multipole moments of the source. These numbers are frequently computed with expressions obtained after the long-wavelength approximation. Here, we derive exact expressions for the multipole moments of dynamic sources that resemble in their simplicity their approximate counterparts. We validate our new expressions against analytical results for a spherical source, and then use them to calculate the induced moments for some selected sources with a nontrivial shape. The comparison of the results to those obtained with approximate expressions shows a considerable disagreement even for sources of subwavelength size. Our expressions are relevant for any scientific area dealing with the interaction between the electromagnetic field and material systems.PACS numbers: 78.67. Pt, 13.40.Em,78.67.Bf, 03.50.De The multipolar decomposition of a given chargecurrent distribution is taught in every undergraduate course in physics. The resulting set of numbers are called the multipolar moments. They are classified according to their order, i.e. dipoles, quadrupoles etc... For each order, there are electric and magnetic multipolar moments. Each multipolar moment is uniquely connected to a corresponding multipolar field. Their importance stems from the fact that the multipolar moments of a charge-current distribution completely characterize both the radiation of electromagnetic fields by the source, and the coupling of external fields onto it. The multipolar decomposition is important in any scientific area dealing with the interaction between the electromagnetic field and material systems. In particle physics, the multipole moments of the nuclei provide information on the distribution of charges inside the nucleus. In chemistry, the dipole and quadrupolar polarizabilities of a molecule determine most of its properties. In electrical engineering, the multipole expansion is used to quantify the radiation from antennas. And the list goes on.In this Letter, we present new exact expressions for the multipolar decomposition of an electric charge-current distribution. They provide a straightforward path for upgrading analytical and numerical models currently using the long-wavelength approximation. After the upgrade, the models become exact. The expressions that we provide are directly applicable to the many areas where the multipole decomposition of electrical current density distributions is used. For the sake of concreteness, in this article we apply them to a specific field: Nanophotonics.In nanophotonics, one purpose is to control and manipulate light on the nanoscale. Plasmonic or highindex dielectric nanoparticles are frequently used for this purpose 1,2 . The multipole expansion provides insight into several optical phenomena, such as Fano resonances 3,4 , electromagnetically-induced-transparen...

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Antenna–Cavity Hybrids: Matching Polar Opposites for Purcell Enhancements at Any Linewidth

Cited by 120 publications

References 65 publications

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Molecular Optomechanics in the Anharmonic Cavity-QED Regime Using Hybrid Metal–Dielectric Cavity Modes

An electromagnetic multipole expansion beyond the long-wavelength approximation

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