Spectral composition and spatial distribution of thermal fields near a solid surface

Dorofeyev, Illarion; Vinogradov, E. A.

doi:10.1088/1054-660x/23/6/065903

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…Our conclusions can be extended to calculate a distance dependent transition linewidth [12,13] using the imaginary part of the linear susceptibility matrix. Although our treatment was entirely performed in the case of thermal equilibrium, our demonstration that the near field temperature dependence is solely due to the excitation of evanescent surface waves suggests that in the near field our results are also valid in an out of equilibrium case with T being the temperature of the surface [44]. A complete treatment of the out of equilibrium case for excited state atoms or molecules is, however, more challenging.…”

Section: Discussionmentioning

confidence: 94%

Casimir-Polder effect with thermally excited surfaces

Laliotis

Ducloy

2015

Phys. Rev. A

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We take a closer look at the fundamental Casimir-Polder interaction between quantum particles and dispersive dielectric surfaces with surface polariton or plasmon resonances. Linear response theory shows that in the near field, van der Waals, regime the free energy shift of a particle contains a thermal component that depends exclusively on the population/excitation of the evanescent surface polariton/plasmon modes. Our work makes evident the link between particle surface interaction and near field thermal emission and demonstrates how this can be used to engineer Casimir-Polder forces. We also examine how the exotic effects of surface waves are washed out as the distance from the surface increases. In the case of molecules or excited state atoms, far field approximations result in a classical dipole-dipole interaction which depends on the surface reflectivity and the mean number of photons at the frequency of the atomic/molecular transition. Finally we present numerical results for the CP interaction between Cs atoms and various dielectric surfaces with a single polariton resonance and discuss the implications of temperature and retardation effects for specific spectroscopic experiments.The Casimir-Polder (CP) interaction between a polarisable quantum object (atom or molecule) and a surface arises from quantum fluctuations in vacuum. It's an excellent candidate for fundamental tests of cavity quantum electrodynamics and crucial for any experiments attempting to measure non-Newtonian gravity interactions [1,2]. CP forces are also relevant in physical chemistry playing an important role in the interpretation of physical phenomena such as atomic adsorption and desorption from hot surfaces or even surface chemistry and catalysis . The continuous urge for miniaturisation has led to integrated devices, such as atom and molecule chips [3][4][5][6], used for a variety of applications and more recently tapered nano-fibers were used to trap atoms at distances as small as 200 nm away from the surface [7][8][9], where atom-surface forces become exceedingly relevant. Novel trapping schemes that exploit the complexity of the van der Waals (vdW) potential of excited atoms have also been proposed [10].The most basic description of the CP effect is that of a classical dipole interacting with its surface induced image. This approach is mostly valid in the vdW (z −3 law) regime, but QED theory [11] revealed that when distances are larger than the wavelength corresponding to atomic transition, retardation effects scramble the interaction giving a z −4 distance dependence. For excited state atoms or molecules an additional contribution [12,13] resembling the interaction of an antenna with its own reflected field has to be considered [14]. Thermal corrections to the CP force are analogous to the black body radiation induced corrections to the well known Lamb shift [15]. In thermal equilibrium the problem has been * athanasios.laliotis@univ-paris13.fr considered by several authors [16][17][18]. A novel behaviour was predicted when th...

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Section: Discussionmentioning

confidence: 94%

Casimir-Polder effect with thermally excited surfaces

Laliotis

Ducloy

2015

Phys. Rev. A

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“…Previously, we made an assumption [12] that the decomposition of molecules near the surface of an ionic crystal can occur as a result of their tunnel ionization upon the combined action of the electric field of the femtosecond radiation and a thermally stimulated Coulomb field of the dipole type (near field), which fluctuates near the crystal surface [20,21]. Here, we present the results of our calculations of the intensity of such a field as a function of the distance from the surface of the ionic crystals that were used in our experiments (see figure 7).…”

Section: Discussionmentioning

confidence: 99%

IR femtochemistry on the surface of wide-gap ionic crystals

et al. 2018

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We have found and studied a phenomenon of the growth of films resulting from decomposition of some organic and silicon-containing molecules adsorbed on the surface of ionic crystals under the action of IR (1.4-5.4 µm) femtosecond radiation of a moderate intensity, ~10 11 W cm −2 . In the gas phase, these molecules do not decompose. Microstructured films consisting of amorphous carbon, graphite oxide, and silicon dioxide have been obtained. The formation of carbon films was accompanied by the appearance of different hydrocarbons in the gas phase. The extensive films of graphite oxide have been obtained. The decomposition of molecules on the surface is apparently caused by non-resonant ionization and subsequent deep fragmentation. The mechanisms of ionization at relatively low intensities of the femtosecond IR radiation have been discussed.

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“…For instance, the correlation radius of propagating waves of the black body field is on the order of the Wien wavelength [2,14], whereas the corresponding scale of the evanescent field depends on the electrodynamic properties of materials and other parameters of the problem undergoing study, and the energy density in the near field regime can be much larger in magnitude than in the far field regime. Modern development and illustrative examples have been presented [5][6][7][8][9]. The general formulas that describe the spatiotemporal correlations of the thermally stimulated field at any distance from the half space with flat boundary were derived by Rytov [2].…”

Section: Introductionmentioning

confidence: 99%

Anisotropy in spatial correlations of thermal fields of heated samples of ZnSe

Dorofeyev

Vinogradov

2014

Laser Phys.

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Anisotropy in spatial coherence of thermal fields generated by the heated half-space of ZnSe radiating into a vacuum has been studied and is presented here. The frequency and distance dependencies of the coherence tensors of lateral and normal components of thermal fields are shown. Strong anisotropy in the near field zone is exemplified at different frequencies. It was confirmed that the coherence length within the frequency band of surface polariton excitations depends on the slope of the dispersion curve. The spatial coherence reaches the maximum degree at the initial part of dispersion curve and then is effectively suppressed at the frequency of quasistatic or Coulomb surface polariton. We also demonstrated that the smaller the distance from the surface, the smaller the correlation length of the thermal field up to the delta-correlated fields and their sources within the heated body. In the far zone, the anisotropy in the spatial coherences of components is much smaller than in the near field regime. The traces of the corresponding tensors in the far zone are calculated for the equilibrium and nonequilibrium problems.

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Spectral composition and spatial distribution of thermal fields near a solid surface

Cited by 6 publications

References 27 publications

Casimir-Polder effect with thermally excited surfaces

Casimir-Polder effect with thermally excited surfaces

IR femtochemistry on the surface of wide-gap ionic crystals

Anisotropy in spatial correlations of thermal fields of heated samples of ZnSe

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