A microfabricated Fabry-Perot optical resonator has been used for atom detection and photon production with less than 1 on average in the cavity mode. Our design combines intrinsic scalability of microfabrication processes direct coupling field to single-mode waveguides or fibers. The presence is seen through changes both intensity noise characteristics probe light reflected from input mirror. An excitation laser passing transversely triggers emission into mode hence fiber. These are first...

In a thin cell of dilute vapour, the absorption spectrum exhibits sub-Doppler features due to relative enhancement slow atom contribution, with respect transient nature interaction moving atoms. For two-level system in linear regime, narrowest response is predicted be found for λ/2 thickness, as an effect coherent character dipole early described by Romer and Dicke (Phys. Rev., 99 (1955) 532) microwave regime. We report here on direct observation this optical regime ultra-thin vapour cell....

The van der Waals atom-surface attraction, scaling as C3 z-3 for z the distance, is expected to be valid in distance range 1-1000 nm, covering 8-10 orders of magnitudes interaction energy. A Cs vapour nanocell allows us analyze spectroscopic modifications induced by attraction on 6P3/2->6D5/2 transition. measured value found independent thickness explored 40-130 and agreement with an elementary theoretical prediction. We also discuss specific interest exploring short distances large

We present a method utilizing atomic diffraction patterns and statistical analysis tools to infer the Casimir-Polder interaction between argon atoms silicon nitride nanograting. The quantum model that supports data is investigated in detail, as are roles of nanograting geometry, finite-size effects, slit width opening angles, Lennard-Jones potentials, patch potentials. Our findings indicate atom-surface potential strength parameter <a:math...

Transmission spectroscopy in an ultrathin vapor cell, which has been recently demonstrated as a new method of sub-Doppler the optical domain, is revisited. We show that, because unavoidable Fabry–Perot effect, observed signal—in transmission and selective reflection well—is actually interferometric mixture responses provided by long macroscopic cell. After derivation very general solution, we restrict ourselves to case linear interaction with resonant laser. finally discuss application...

At nanometer separation, the dominant interaction between an atom and a material surface is fluctuation-induced Casimir-Polder potential. We demonstrate that slow atoms crossing silicon nitride transmission nanograting are remarkably sensitive probe for A 15% difference nonretarded (van der Waals) retarded potentials discernible at distances smaller than 51 nm. discuss relative influence of various theoretical experimental parameters on potential in detail. Our work paves way to...

We present a theoretical model of matter-wave diffraction through material nanostructure. This is based on the numerical solution time-dependent Schrödinger equation, which goes beyond standard semiclassical approach. In particular, we consider dispersion force interaction between atoms and material, responsible for high energy variations. The effect such forces quantum investigated, along with comparison model. at low velocity close to surface, approach fails, while accurately describes...

We consider the extension of optical metamaterials to matter waves and then down scaling metaoptics nanometric wavelengths. show that generic property pulsed comoving magnetic fields allows us fashion wave-number dependence atomic phase shift. It can be used produce a transient negative group velocity an wave packet, which results into refraction wave. Application slow metastable argon atoms Ar(3P2) shows device is able operate either as efficient beam splitter or metalens.

The distance-dependence of the anisotropic atom-wall interaction is studied. central result 1/z^6 quadrupolar anisotropy decay in retarded Casimir-Polder regime. Analysis transition region between non-retarded van der Waals regime (in 1/z^3) and shows that cross-over occurs at very short distances from surface, on order 0.03 Lambda, where Lambda atom characteristic wavelength. Possible experimental verifications this distance dependence are discussed.

The resonant metastability exchange process in low-energy collinear collisions between metastable argon atoms (Ar* 3P2) polarized spin (M = +2) and ground-state Ar from a nozzle beam is studied by means of time-of-flight technique. A wide range atom velocities the laboratory frame (275 m s−1 down to 50 s−1) obtained use Zeeman slower, counter-propagating laser which locked frequency onto 3P2–3D3 closed transition (λ 811.5 nm). accessible centre-of-mass energy (8–27 meV) has not been explored...

A pulsed beam of metastable argon atoms having a low tunable velocity (10 to 150 m s−1) is produced with very substantial brightness (9 × 108Ar* s−1 sr−1). The present original experimental configuration leads variable dispersion that can be smaller than the standard Brownian one. This behaviour, analysed using Monte Carlo simulations, exhibits momentum stretching (heating) or narrowing (cooling) entirely due subtle combination Doppler and Zeeman effects.

Since the recent realization of extremely thin vapour cells (local thickness: 20-1000 nm), we investigate optical properties these 1-D confined vapours. Aside from their interest for Doppler-free spectroscopy, nanocells offer a new tool to evaluate collisional shift and broadening, yielding an access open problem collisions under confinement. It also allows probing atom-surface interaction in range unusual short distances. The experimental exploration distance dependence, normally evolving...

This paper presents our current measurements in a vapor nanocell aiming at test of the distance-dependence atom-surface interaction, when simple asymptotic descriptions may turn to be not valid. A state-of-the-art interaction is provided as an introduction, along with comparison theory van der Waals (or Casimir-Polder) interaction; it followed by presentation most salient features spectroscopy

van der Waals-Zeeman transitions between magnetic states of metastable rare-gas atoms Ar*, Kr* and Xe* (3P2) induced by a solid surface in the presence field, are investigated theoretically experimentally. By use Zeeman slower, argon with various velocities ranging from 170 to 560 m/s allow us investigate small impact parameter range (3–7 nm) within which these occur, as well effect atom polarisation on sharing out M states.

A promising technique of atom slowing is proposed. It based upon the dispersive interaction atoms with optical potential pulses generated by a far-off-resonance standing wave modulated in time. Each pulse reduces velocity small amount. By repeating process thousands times, can be lowered from several hundreds meters per second down to almost zero, over path as short $20\phantom{\rule{0.28em}{0ex}}\mathrm{c}\mathrm{m}$. In absence any random recoil process, initial characteristics beam are preserved.

We present a method utilizing atomic diffraction patterns and statistical analysis tools to infer the Casimir-Polder interaction between Argon atoms silicon nitride nanograting. The quantum model that supports data is investigated in detail, as are roles of nanograting geometry, finite size effects, slit width opening angles, Lennard-Jones potentials. Our findings indicate atom-surface potential strength parameter C3 = 6.87 $\pm$ 1.18 meV.nm3. This value primarily constrained by knowledge...

The collision between a spin polarized metastable argon atom in Ar* (3p 5 4s, 3 P 2 , M = +2) state slightly decelerated by the Zeeman slower-laser technique and co-propagating thermal ground Ar 6 1 S 0 ), both merged from same supersonic beam, but coming through adjacent slots of rotating disk, is investigated at center-of-mass energies ranging to 10 meV.The duration laser pulse synchronised with disk allows tuning relative velocity thus energy.At these sub-thermal energies, "resonant...

The principle of coherent Dicke narrowing in a thin vapour cell, which sub-Doppler spectral lineshapes are observed under normal irradiation for l/2 thickness, is generalized to two-photon spectroscopy. Only the sum two wave vectors must be making scheme highly versatile. A comparison provided between with copropagating fields, and residual Doppler-broadening occurring counterpropagating geometries. experimental feasibility discussed on basis first observation resonance 300 nm-thick Cs cell....