Extreme-ultraviolet refractive optics

Drescher, Lorenz; Kornilov, Oleg; Witting, Tobias; Reitsma, Geert; Monserud, Nils C.; Rouzée, Arnaud; Mikosch, Jochen; Vrakking, Marc J. J.; Schütte, Bernd

doi:10.1038/s41586-018-0737-3

Cited by 50 publications

(20 citation statements)

References 53 publications

(58 reference statements)

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“…In the VUV region, however, there are frequent inconsistencies, often not in the position of absorption bands but rather in their strength, as demonstrated above in the case of water. It should be noted that, although it is easy to measure complex dielectric functions of insulators in the visible and near-UV range, the techniques needed to measure optical constants of materials in the VUV range are at their infancy due to the high absorbance of almost all materials in this range ( 36 ). Nonetheless, the optical constants in the VUV region have the largest contribution to Casimir-vdW forces in the most relevant interbody distances, typically ranging from a few nanometers to a fraction of a micrometer ( 30 ).…”

Section: Resultsmentioning

confidence: 99%

Self-consistent dielectric functions of materials: Toward accurate computation of Casimir–van der Waals forces

Gudarzi

Aboutalebi

2021

Sci. Adv.

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Research on theoretical calculation of Casimir–van der Waals (vdW) forces is characterized by a great number of inconsistencies and conflicting reports with widely differing results for many known materials, including water, contradicting experimental measurements. Despite its importance for conceptual advances in both fundamental aspects and practical applications, a universal framework for the accurate determination of Casimir-vdW forces is lacking. Here, we propose a universal theoretical platform for computing Casimir-vdW forces, accounting for the electronic dielectric constant, optical bandgap, density, and chemical composition. Using this methodology, we determine the dielectric function for 55 materials, over a wide range of photon energies, covering an extensive list of common metals, organic and inorganic semiconductors, and insulators. Internal consistency of the compiled data is validated using optical sum rules and Kramers-Kronig relations. We demonstrate that the calculated vdW forces based on these data match remarkably well with the experimentally measured vdW forces.

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Section: Resultsmentioning

confidence: 99%

Self-consistent dielectric functions of materials: Toward accurate computation of Casimir–van der Waals forces

Gudarzi

Aboutalebi

2021

Sci. Adv.

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“…Light-matter interactions can be addressed from two complementary points of view [1]. Just as light can be used as a tool to probe and control matter [2][3][4][5][6][7], atoms can be exploited to probe and control light [8][9][10][11][12][13][14]. The recently demonstrated technique of opto-optical modulation (OOM) [8,9] is an example of this duality in the realm of ultrafast extreme ultraviolet (XUV) sources.…”

Section: Introductionmentioning

confidence: 99%

Probing Stark-induced nonlinear phase variation with opto-optical modulation

Simpson¹,

Labeye

Camp

et al. 2019

Phys. Rev. A

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We extend the recently developed technique of opto-optical modulation (OOM) to probe stateresolved ac-Stark-induced phase variations of a coherently excited ensemble of helium atoms. In a joint experimental and theoretical study, we find that the spatial redirection of the resonant emission from the OOM process is different for the low-lying 1s2p state as compared with the higher-lying Rydberg states, and that this redirection can be controlled through the spatial characteristics of the infrared (IR) probe beam. In particular, we observe that the intensity dependence of the IR-induced Stark phase on the 1s2p emission is nonlinear, and that the phase accumulation changes sign for moderate intensities. Our results suggest that OOM, combined with precise experimental shaping of the probe beam, could allow future measurements of Stark-induced phase shifts of excited states.

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“…An experimental setup previously described in detail [3,21,22] was used to measure RABBITT signals from (near-)resonant two-photon ionization of helium.…”

mentioning

confidence: 99%

Phase-Dependence of Resonant and Antiresonant Two-Photon Excitations

Drescher,

Witting,

Kornilov

et al. 2021

Preprint

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Measurements of the phase of two-photon matrix elements are presented for near-resonant twocolor ionization of helium. A tunable, narrow-bandwidth, near-infrared (NIR) laser source is used for extreme ultra-violet (XUV) high-harmonic generation (HHG). The 15th harmonic of the laser is used within (1+1') XUV+NIR two-photon ionization, and tuned in and out of resonance with members of the 1snp 1 P1 (n = 3, 4, 5) Rydberg series. Rapid changes in the phase of the two-photon matrix elements around resonances and at the mid-way point between two resonances are observed, encoding the relative importance of resonant and near-resonant two-color ionization. Similar effects are observed for (1+2') XUV+NIR three-photon ionization. The experimental results are compared to a perturbative model and numerical solution of the time-dependent Schrödinger equation (TDSE) in the single active electron (SAE) approximation.

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Extreme-ultraviolet refractive optics

Cited by 50 publications

References 53 publications

Self-consistent dielectric functions of materials: Toward accurate computation of Casimir–van der Waals forces

Self-consistent dielectric functions of materials: Toward accurate computation of Casimir–van der Waals forces

Probing Stark-induced nonlinear phase variation with opto-optical modulation

Phase-Dependence of Resonant and Antiresonant Two-Photon Excitations

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