StroCOMP: Strong Coupling of Organic Molecules and Plasmons
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StroCOMP is funded by a Marie Curie Career Integration Grant of the European Union Seventh Framework Programme.

Summary

The improvement of fabrication technology over the last decades enables the accurate creation of almost arbitrarily shaped nanoscale metal structures. In such systems, quasi-bound surface modes (plasmons) provide strong, sub-wavelength confinement of electromagnetic fields. This confinement leads to strongly increased coupling between light and matter, and increases the possible spatial resolution, making it possible to surpass the diffraction limit of conventional optics. These properties make plasmonics a quickly growing and multidisciplinary subject, with applications in physics, chemistry, biology and engineering. A particularly relevant topic is the coupling of quantum emitters (such as atoms, molecules, quantum dots, or color centers in diamond) to plasmons. By concentrating light with the use of plasmons, the mismatch between the absorption cross section of the emitter and the size of the light beam can be circumvented. It is then even possible to reach the strong coupling regime, where the elementary excitations become hybrid states with mixed light-matter character, so called exciton-polaritons. The major aim of StroCOMP is to develop new insights into the strong coupling between plasmons and organic molecule excitation. Due to the complex molecular structure, organic molecule exciton-polaritons are still not fully understood. A further goal of the project is to study the manipulation of chemical structure and reactions through strong coupling, exploiting the modification of the chemical potential energy surface.

People

Johannes Dr. Johannes Feist
Marie Curie CIG Research Fellow
johannes.feist@uam.es

Departamento de Física Teórica de la Materia Condensada
Facultad de Ciencias, Module C-05, 503
Universidad Autónoma de Madrid
Tel.: +34 91497 2662
FJ Prof. Francisco J. García Vidal
Scientific coordinator
fj.garcia@uam.es

Departamento de Física Teórica de la Materia Condensada
Facultad de Ciencias, Module C-05, 401.2
Universidad Autónoma de Madrid
Tel.: +34 91497 8515
Javier Javier Galego Pascual
PhD student
javier.galego@uam.es

Departamento de Física Teórica de la Materia Condensada
Facultad de Ciencias, Module C-05, 305
Universidad Autónoma de Madrid

Publications

Publications financially supported by StroCOMP:

    2017

  1. Study of radiative heat transfer in Ångström- and nanometre-sized gaps (PDF)
    L. Cui, W. Jeong, V. Fernández-Hurtado, J. Feist, F. J. García-Vidal, J. C. Cuevas, E. Meyhofer, and P. Reddy
  2. Enhancing Photon Correlations through Plasmonic Strong Coupling
    R. Sáez-Blázquez, J. Feist, A. I. Fernández-Domínguez, and F. J. García-Vidal
  3. Plasmon-exciton-polariton lasing (PDF)
    M. Ramezani, A. Halpin, A. I. Fernández-Domínguez, J. Feist, S. R.-K. Rodriguez, F. J. Garcia-Vidal, and J. Gómez Rivas
    Abstract: ...Metallic nanostructures provide a toolkit for the generation of coherent light below the diffraction limit. Plasmonic-based lasing relies on the population inversion of emitters (such as organic fluorophores) along with feedback provided by plasmonic resonances. In this regime, known as weak light–matter coupling, the radiative characteristics of the system can be described by the Purcell effect. Strong light–matter coupling between the molecular excitons and electromagnetic field generated by the plasmonic structures leads to the formation of hybrid quasi-particles known as plasmon-exciton-polaritons (PEPs). Due to the bosonic character of these quasi-particles, exciton-polariton condensation can lead to laser-like emission at much lower threshold powers than in conventional photon lasers. Here, we observe PEP lasing through a dark plasmonic mode in an array of metallic nanoparticles with a low threshold in an optically pumped organic system. Interestingly, the threshold power of the lasing is reduced by increasing the degree of light–matter coupling in spite of the degradation of the quantum efficiency of the active material, highlighting the ultrafast dynamic responsible for the lasing, i.e., stimulated scattering. These results demonstrate a unique room-temperature platform for exploring the physics of exciton-polaritons in an open-cavity architecture and pave the road toward the integration of this on-chip lasing device with the current photonics and active metamaterial planar technologies.
  4. 2016

  5. Exploiting vibrational strong coupling to make an optical parametric oscillator out of a Raman laser (PDF)
    J. del Pino, F. J. Garcia-Vidal, and J. Feist
  6. Suppressing photochemical reactions with quantized light fields (PDF)
    J. Galego, F. J. Garcia-Vidal, and J. Feist
  7. When polarons meet polaritons: Exciton-vibration interactions in organic molecules strongly coupled to confined light fields (PDF)
    N. Wu, J. Feist, and F. J. Garcia-Vidal
  8. Uncoupled Dark States Can Inherit Polaritonic Properties (PDF)
    C. Gonzalez-Ballestero, J. Feist, E. Gonzalo Badía, E. Moreno, and F. J. Garcia-Vidal
  9. 2015

  10. Signatures of Vibrational Strong Coupling in Raman Scattering (PDF)
    J. del Pino, J. Feist, and F. J. Garcia-Vidal
  11. Radiative heat transfer in the extreme near field (PDF)
    K. Kim, B. Song, V. Fernández-Hurtado, W. Lee, W. Jeong, L. Cui, D. Thompson, J. Feist, M. T. H. Reid, F. J. García-Vidal, J. C. Cuevas, E. Meyhofer, and P. Reddy
    Abstract: ...Radiative transfer of energy at the nanometre length scale is of great importance to a variety of technologies including heat-assisted magnetic recording, near-field thermophotovoltaics and lithography. Although experimental advances have enabled elucidation of near-field radiative heat transfer in gaps as small as 20-30 nanometres, quantitative analysis in the extreme near field (less than 10 nanometres) has been greatly limited by experimental challenges. Moreover, the results of pioneering measurements differed from theoretical predictions by orders of magnitude. Here we use custom-fabricated scanning probes with embedded thermocouples, in conjunction with new microdevices capable of periodic temperature modulation, to measure radiative heat transfer down to gaps as small as two nanometres. For our experiments we deposited suitably chosen metal or dielectric layers on the scanning probes and microdevices, enabling direct study of extreme near-field radiation between silica-silica, silicon nitride-silicon nitride and gold-gold surfaces to reveal marked, gap-size-dependent enhancements of radiative heat transfer. Furthermore, our state-of-the-art calculations of radiative heat transfer, performed within the theoretical framework of fluctuational electrodynamics, are in excellent agreement with our experimental results, providing unambiguous evidence that confirms the validity of this theory for modelling radiative heat transfer in gaps as small as a few nanometres. This work lays the foundations required for the rational design of novel technologies that leverage nanoscale radiative heat transfer.
  12. Cavity-Induced Modifications of Molecular Structure in the Strong-Coupling Regime (PDF)
    J. Galego, F. J. Garcia-Vidal, and J. Feist
  13. Harvesting excitons through plasmonic strong coupling (PDF)
    C. Gonzalez-Ballestero, J. Feist, E. Moreno, and F. J. Garcia-Vidal
  14. Quantum theory of collective strong coupling of molecular vibrations with a microcavity mode (PDF)
    J. del Pino, J. Feist, and F. J. Garcia-Vidal
  15. Extraordinary Exciton Conductance Induced by Strong Coupling (PDF)
    J. Feist and F. J. Garcia-Vidal