Centre d’Élaboration de Matériaux et d’Etudes Structurales

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Nano-Optics & Plasmonics

Dielectric Nano-antennas

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High refractive index dielectric nanostructures have original optical properties related to the presence of optical resonances which depend on their shape and dimensions. These nano-objects are increasingly studied as alternatives to plasmonic nanostructures to enhance and control light-matter interaction at the subwavelength scale.

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Quantum Plasmonics and NanoOptics

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Quantum Plasmonics & NanoOptics aim at transposing at 2D the concepts of Quantum Optics by replacing a high-Q cavity mode by a plasmon polariton sustained by a metallic nanostructure or by a photonic mode in a dielectric nanocavity with appropriate geometry.

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Theory of Complex Nano-optical Systems

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As part of our research work related to nano-optics and nano-photonics, we have developed new concepts and theories together with flexible and reliable numerical codes to describe the complex architectures associated with our current experimental measurements. Among several challenging theoretical objectives related to our activity, we will mention the general theory of Green dyadic functions for electrodynamics computations (field mapping, LDOS, heat dissipation and temperature, far-field and EELS spectra) together with numerical tools for describing plasmon-molecules interactions in the near-field (decay rate, molecule emission pattern, and Maxwell-Bloch equations).

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Ohmic losses in plasmonic structures have always been considered as a major drawback for long-range propagation and the realization of efficient devices. Yet the possibility to control the rise of temperature with illumination parameters (wavelength, polarization) has fostered a strong interest in the NanoOptics community. This active research field, called thermoplasmonics, could potentially lead to breakthroughs in several fields like nanomedicine, nanochemistry or thermo-hydrodynamically assisted plasmonic trapping and manipulation.

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STM & photons

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When the metallic tip of a scanning tunneling microscope (STM) is biased with a few volts and scans the conductive surface of a metallic or semiconductor sample, an STM-induced luminescence can be excited and observed.

This activity is developped in collaboration with the GNS and SINanO groups.

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Hybrid Plasmonics

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Coupled to other elementary excitations, such as phonons and excitons, the surface plasmons open new ways in terms of spatial and spectral control of the local electromagnetic field. Indeed, new hybrid plasphonics and plexitonics excitations come out when the optical resonances are fine tuned to form mixed optical states.

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Owing to their ability to absorb the light and convert it into electron-hole pairs, within few tens of femto-seconds, the surface plasmons act as efficient electromagnetic-to-electric energy converters.

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