1,651 research outputs found
Transformation Optics Approach to Plasmon-Exciton Strong Coupling in Nanocavities
We investigate the conditions yielding plasmon-exciton strong coupling at the
single emitter level in the gap between two metal nanoparticles. A
quasi-analytical transformation optics approach is developed that makes
possible a thorough exploration of this hybrid system incorporating the full
richness of its plasmonic spectrum. This allows us to reveal that by placing
the emitter away from the cavity center, its coupling to multipolar dark modes
of both even and odd parity increases remarkably. This way, reversible dynamics
in the population of the quantum emitter takes place in feasible
implementations of this archetypal nanocavity.Comment: 5 pages, 4 figure
High-order localized spoof surface plasmon resonances and experimental verifications
We theoretically demonstrated and experimentally verified high-order radial
spoof localized surface plasmon resonances supported by textured metal
particles. Through an effective medium theory and exact numerical simulations,
we show the emergence of these geometrically-originated electromagnetic modes
at microwave frequencies. The occurrence of high-order radial spoof plasmon
resonances is experimentally verified in ultrathin disks. Their spectral and
near-field properties are characterized experimentally, showing an excellent
agreement with theoretical predictions. Our findings shed light into the nature
of spoof localized surface plasmons, and open the way to the design of
broadband plasmonic devices able to operate at very different frequency
regimes.Comment: 29 pages, 10 figure
Comment on “Surface Plasmons and Nonlocality: A Simple Model”
In the Comment [1], Schaich calculated the mode dispersion of surface plasmons supported by a planar metal-dielectric-metal (MIM) structure, and concluded that our model [2] fails to mimic the effect of nonlocality at high frequencies. Here, we shall clarify the difference between our calculations and that in Schaich’s Comment, and highlight the validity of our model for a general class of plasmonic structures.Published versio
Super-Planckian far-field radiative heat transfer
We present here a theoretical analysis that demonstrates that the far-field radiative heat transfer between objects with dimensions smaller than the thermal wavelength can overcome the Planckian limit by orders of magnitude. To guide the search for super-Planckian far-field radiative heat transfer, we make use of the theory of fluctuational electrodynamics and derive a relation between the far-field radiative heat transfer and the directional absorption efficiency of the objects involved. Guided by this relation, and making use of state-of-the-art numerical simulations, we show that the far-field radiative heat transfer between highly anisotropic objects can largely overcome the black-body limit when some of their dimensions are smaller than the thermal wavelength. In particular, we illustrate this phenomenon in the case of suspended pads made of polar dielectrics like SiN or SiO2. These structures are widely used to measure the thermal transport through nanowires and low-dimensional systems and can be employed to test our predictions. Our work illustrates the dramatic failure of the classical theory to predict the far-field radiative heat transfer between micro- and nanodevicesWe acknowledge funding from
the Spanish MINECO (FIS2015-64951-R, MAT2014-53432-
C5-5-R, FIS2014-53488-P, FIS2017-84057-P), the Comunidad
de Madrid (S2013/MIT-2740), the European Union
Seventh Framework Programme (FP7-PEOPLE-2013-CIG-
630996, FP7-PEOPLE-2013-CIG-618229), and the European
Research Council (ERC-2011-AdG-290981 and ERC-2016-
STG-714870). V.F.-H. acknowledges support from “la Caixa”
Foundation and J.C.C. thanks the DFG and SFB767 for
sponsoring his stay at the University of Konstanz as Mercator Fello
Transformation optics for plasmonics: from metasurfaces to excitonic strong coupling
We review the latest theoretical advances in the application of the framework
of Transformation Optics for the analytical description of deeply
sub-wavelength electromagnetic phenomena. First, we present a general
description of the technique, together with its usual exploitation for
metamaterial conception and optimization in different areas of wave physics.
Next, we discuss in detail the design of plasmonic metasurfaces, including the
description of singular geometries which allow for broadband absorption in
ultrathin platforms. Finally, we discuss the quasi-analytical treatment of
plasmon-exciton strong coupling in nanocavities at the single emitter level
Photon statistics in collective strong coupling: Nanocavities and microcavities
There exists a growing interest in the properties of the light generated by hybrid systems involving a mesoscopic number of emitters as a means of providing macroscopic quantum light sources. In this work, the quantum correlations of the light emitted by a collection of emitters coupled to a generic optical cavity are studied theoretically using an effective Hamiltonian approach. Starting from the single-emitter level, we analyze the persistence of photon antibunching as the ensemble size increases. Not only is the photon blockade effect identifiable, but photon antibunching originated from destructive interference processes, the so-called unconventional antibunching, is also present. We study the dependence of these two types of negative correlations on the spectral detuning between cavity and emitters, as well as its evolution as the time delay between photon detections increases. Throughout this work, the performance of plasmonic nanocavities and dielectric microcavities is compared: despite the distinct energy scales and the differences introduced by their respectively open and closed character, the bunching and antibunching phenomenology presents remarkable similarities in both types of cavitiesThis work has been funded by the European Research
Council under Grant Agreements No. ERC-2011-AdG 290981
and No. ERC-2016-STG-714870, the EU Seventh Framework
Programme (Grants No. FP7-PEOPLE-2013-CIG-630996
and No. FP7-PEOPLE-2013-CIG-618229), and the Spanish
MINECO under Contracts No. MAT2014-53432-C5-5-R and
No. FIS2015-64951-R, as well as through the “MarĂa de
Maeztu” programme for Units of Excellence in R&D (Grant
No. MDM-2014-0377)
Organic polaritons enable local vibrations to drive long-range energy transfer
Long-range energy transfer in organic molecules has been experimentally obtained by strongly coupling their electronic excitations to a confined electromagnetic cavity mode. Here, we shed light into the polariton-mediated mechanism behind this process for different configurations: donor and acceptor molecules either intermixed or physically separated. We numerically address the phenomenon by means of Bloch-Redfield theory, which allows us to reproduce the effect of complex vibrational reservoirs characteristic of organic molecules. Our findings reveal the key role played by the middle polariton as the nonlocal intermediary in the transmission of excitations from donor to acceptor molecules. We also provide analytical insights on the key physical magnitudes that help to optimize the efficiency of the long-range energy transferThis work has been funded by the European Research Council under
Grant Agreements No. ERC-2011-AdG 290981 and No. ERC-
2016-STG-714870, the EU Seventh Framework Programme
(FP7-PEOPLE-2013-CIG-630996 and FP7-PEOPLE-2013-
CIG-618229), and the Spanish MINECO under Contracts No.
MAT2014-53432-C5-5-R and No. FIS2015-64951-R, as well
as through the “MarĂa de Maeztu” programme for Units of
Excellence in R&D (MDM-2014-0377)
Enhancing photon correlations through plasmonic strong coupling
© 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibitedThere is an increasing scientific and technological interest in the design and implementation of nanoscale sources of quantum light. Here, we investigate the quantum statistics of the light scattered from a plasmonic nanocavity coupled to a mesoscopic ensemble of emitters under low coherent pumping. We present an analytical description of the intensity correlations taking place in these systems and unveil the fingerprint of plasmon-exciton-polaritons in them. Our findings reveal that plasmonic cavities are able to retain and enhance excitonic nonlinearities, even when the number of emitters is large. This makes plasmonic strong coupling a promising route for generating nonclassical light beyond the single-emitter levelFP7 Ideas: European Research Council (IDEASERC)
(ERC-2011-AdG 290981, ERC-2016-STG-714870,
FP7-PEOPLE-2013-CIG-618229, FP7-PEOPLE-2013-CIG630996);
Ministerio de EconomĂa y Competitividad
(MINECO) (FIS2015-64951-R, MAT2014-53432-C5-5-R,
MDM-2014-0377
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