Athanasios Laliotis
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Multipole expansion for dispersion forces Open
Light-matter interaction models invariably rely on the multipole expansion of the electromagnetic potentials generated by complex charge distributions. These multipoles are typically taken to be traceless; however, for a correct evaluation…
Selective reflection Casimir-Polder spectroscopy in vapor cells: The influence of the thermal velocity distribution Open
International audience
Sub-Doppler spectroscopy of Rydberg atoms via velocity selection memory in a hot vapor cell Open
We study resonance redistribution mechanisms inside a hot vapor cell. This is achieved by pumping atoms on the first cesium resonance, 6S1/2-->6P1/2, and subsequently probing the velocity distribution of the 6P1/2 population by a linear ab…
Near-Field Thermal and Vacuum Fluctuations at an Interface: Experimental Attempts for a Precise Determination of Surface Resonances Open
Oral presentation 25 mn by D. Bloch, audience ~50 participants
Doppler-free selective reflection spectroscopy of electric-quadrupole transitions Open
Electric-dipole-forbidden transitions play an important role as in quantum sensing, quantum information, and fundamental test in physics. As such, the development of novel and sensitive spectroscopic methods is of major interest. Here, we …
Cooperative atomic emission from a line of atoms interacting with a resonant plane surface Open
Cooperative effects such as super- and subradiance can be observed in the\nfluorescence emitted by a system of N atoms in vacuum, after interaction with a\nlaser beam. In the vicinity of a dielectric or metallic surface, Casimir-Polder\nef…
Effects of higher-order Casimir-Polder interactions on Rydberg atom spectroscopy Open
In the extreme near field, when the spatial extension of the atomic wavefunction is no longer negligible compared to the atom-surface distance, the dipole approximation is no longer sufficient to describe Casimir-Polder interactions. Here …
Effects of higher-order Casimir-Polder interactions on Rydberg atom spectroscopy Open
In the extreme near-field, when the spatial extension of the atomic wavefunction is no longer negligible compared to the atom-surface distance, the dipole approximation is no longer sufficient to describe Casimir-Polder interactions. Here …
Probing atoms and molecules close to macroscopic bodies Open
In this habilitation thesis, I briefly present my work at Imperial College London on trapping atomic clouds in micro-pyramids fabricated on silicon chips, which led to the fabrication of an on-chip integrated atom source. Next, I describe …
Spectrally Sharp Near-Field Thermal Emission: Revealing Some Disagreements between a Casimir-Polder Sensor and Predictions from Far-Field Emittance Open
Near-field thermal emission largely exceed blackbody radiation, owing to spectrally sharp emission in surface polaritons. We turn Casimir-Polder interaction between Cs(7P1/2) and a sapphire interface, into a sensor sharply filtering, at 24…
Thin Cell Spectroscopy at Telecommunication Wavelengths: Towards Acetylene based Compact Frequency References Open
International audience
Linear Probing of Molecules at Micrometric Distances from a Surface with Sub-Doppler Frequency Resolution Open
We report on precision spectroscopy of subwavelength confined molecular gases. This was obtained by rovibrational selective reflection of NH_{3} and SF_{6} gases using a quantum cascade laser at λ≈10.6 μm. Our technique probes molecules at…
High-resolution molecular spectroscopy in micrometric thin cells Open
International audience
Velocity preserving transfer between highly excited atomic states: Black Body Radiation and Collisions Open
We study the excitation redistribution from cesium $7\mathrm{P}_{1/2}$ or $7\mathrm{P}_{3/2}$ to neighboring energy levels by Black Body Radiation (BBR) and inter atomic collisions using pump-probe spectroscopy inside a vapor cell. At low …
Velocity preserving transfer between highly excited atomic states: black body radiation and collisions Open
We study the excitation redistribution from cesium 7P 1/2 or 7P 3/2 to neighboring energy levels by black body radiation (BBR) and inter atomic collisions using pump-probe spectroscopy inside a vapor cell. At low vapor densities we measure…
Search for deviations from the ideal Maxwell-Boltzmann distribution for a gas at an interface Open
The isotropic Maxwell-Boltzmann (M-B) velocity distribution is the accepted standard for a gas at thermal equilibrium, with the Doppler width considered to deliver a very precise measurement of the temperature. Nevertheless, the physical n…
View article: HIGH-RESOLUTION LINEAR SPECTROSCOPY ON A MICROMETRIC LAYER OF MOLECULAR VAPOR
HIGH-RESOLUTION LINEAR SPECTROSCOPY ON A MICROMETRIC LAYER OF MOLECULAR VAPOR Open
The rotational spectrum for the complex formed between sulfur trioxide and sulfur dioxide has been observed by chirped-pulse and cavity Fourier transform microwave spectroscopy. Spectra were recorded for five isotopologues that include sin…
Retardation effects in spectroscopic measurements of the Casimir-Polder interaction Open
Spectroscopy is a unique experimental tool for measuring the fundamental Casimir-Polder interaction between excited state atoms, or other polarizable quantum objects, and a macroscopic surface. Spectroscopic measurements probe atoms at nan…
Tailoring optical metamaterials to tune the atom-surface Casimir-Polder interaction Open
We tailor the atom-surface Casimir-Polder interaction of cesium atoms using near-infrared surface plasmons of a metamaterial.
Retardation effects in spectroscopic measurements of the Casimir-Polder interaction Open
Spectroscopy is a unique experimental tool for measuring the fundamental Casimir-Polder interaction between excited state atoms, or other polarizable quantum objects, and a macroscopic surface. Spectroscopic measurements probe atoms at nan…
Backward-emitted sub-Doppler fluorescence from an optically thick atomic vapor Open
Literature mentions only incidentally a sub-Doppler contribution in the\nexcitation spectrum of the backward fluorescence of a dense vapor. This\ncontribution is here investigated on Cs vapor, both on the first resonance line\n(894 nm) and…
Experimental and Simulation Data and Codes Open
Compilation of the SR data run and analysis done on metamaterial and Caesium vapour.
Tuning Casimir-Polder interactions in atom-metamaterial hybrid devices Open
We report on the coupling of a surface plasmonic mode with a thermal vapor of cesium atoms. The plasmonic resonance is created using a nano-structured metallic surface. By changing the geometrical properties of the metamaterial, we tune th…
Spectroscopy of Atoms Confined to Micrometric Pores in Glass Open
International audience