70 citations · 221 across the 20 of their papers we have counts for
20 papers
Thermal Effects in the Casimir Torque between Birefringent Plates
Benjamin Spreng, Jeremy N. Munday
The Casimir effect, originating from quantum and thermal fluctuations, is well known for inducing forces between closely spaced surfaces. When these surfaces are optically anisotro…
Casimir repulsion with biased semiconductors
Benjamin Spreng, Calum Shelden, Tao Gong +1
Quantum and thermal fluctuations are fundamental to a plethora of phenomena within quantum optics, including the Casimir effect that acts between closely separated surfaces typical…
Universal Casimir attraction between filaments at the cell scale
Benjamin Spreng, Hélène Berthoumieux, Astrid Lambrecht +3
The electromagnetic Casimir interaction between dielectric objects immersed in salted water includes a universal contribution that is not screened by the solvent and therefore long…
A universal attractive interaction between filaments at the cell scale
Anne-Florence Bitbol, Hélène Berthoumieux, Benjamin Spreng +2
Actin filaments and microtubules both often form bundles of parallel filaments within cells. Here, we shed light on a universal attractive interaction between two such parallel fil…
Enhanced repulsive Casimir forces between gold and thin magnetodielectric plates
Calum Shelden, Benjamin Spreng, Jeremy N. Munday
We calculate repulsive Casimir forces between metallic and magnetic plates and quantitatively probe the magnetic plate's properties as tuning knobs for the repulsion. Namely, the p…
Electrically switchable Casimir forces using transparent conductive oxides
Tao Gong, Benjamin Spreng, Miguel Camacho +3
Casimir forces between charge-neutral bodies originate from quantum vacuum fluctuations of electromagnetic fields, which exhibit a critical dependence on material's electromagnetic…
Casimir effect between spherical objects: proximity-force approximation and beyond using plane waves
Tanja Schoger, Benjamin Spreng, Gert-Ludwig Ingold +1
For the Casimir interaction between two nearby objects, the plane-wave basis proves convenient for numerical calculations as well as for analytical considerations leading to an opt…
Universal Casimir interactions in the sphere-sphere geometry
Tanja Schoger, Benjamin Spreng, Gert-Ludwig Ingold +3
We study universal Casimir interactions in two configurations which appear as dual to each other. The first involves spheres described by the Drude model and separated by vacuum wh…
The Effect of Epsilon-Near-Zero (ENZ) Modes on the Casimir Interaction between Ultrathin Films
Tao Gong, Inigo Liberal, Benjamin Spreng +3
Vacuum fluctuation-induced interactions between macroscopic metallic objects result in an attractive force between them, a phenomenon known as the Casimir effect. This force is the…
Radiative energy bandgap of nanostructures coupled with quantum emitters around the epsilon-near-zero (ENZ) frequency
Tao Gong, Inigo Liberal, Miguel Camacho +3
Epsilon-near-zero (ENZ) materials have been demonstrated to exhibit unique electromagnetic properties. Here we propose the concept of radiative energy bandgap for an ENZ nanopartic…
Universal Casimir interaction between two dielectric spheres in salted water
Tanja Schoger, Benjamin Spreng, Gert-Ludwig Ingold +2
We study the Casimir interaction between two dielectric spheres immersed in a salted solution at distances larger than the Debye screening length. The long distance behavior is dom…
Engineering Casimir interactions with epsilon-near-zero materials
Miguel Camacho, Tao Gong, Benjamin Spreng +3
In this paper we theoretically demonstrate the tunability of the Casimir force both in sign and magnitude between parallel plates coated with dispersive materials. We show that thi…
Measurement of the Casimir Force between 0.2 and 8 mum: Experimental Procedures and Comparison with Theory
Giuseppe Bimonte, Benjamin Spreng, Paulo A. Maia Neto +4
We present results on the determination of the differential Casimir force between an Au-coated sapphire sphere and the top and bottom of Au-coated deep silicon trenches performed b…
Probing the screening of the Casimir interaction with optical tweezers
L. B. Pires, D. S. Ether, B. Spreng +13
We measure the colloidal interaction between two silica microspheres in aqueous solution in the distance range from m to m with the help of optical tweezers. When e…
Casimir Interaction Between a Plane and a Sphere: Correction to the Proximity-Force Approximation at Intermediate Temperatures
Vinicius Henning, Benjamin Spreng, Paulo A. Maia Neto +1
We consider the Casimir interaction energy between a plane and a sphere of radius at finite temperature as a function of the distance of closest approach . Typical exper…
Plane-wave approach to the exact van der Waals interaction between colloid particles
Benjamin Spreng, Paulo A. Maia Neto, Gert-Ludwig Ingold
The numerically exact evaluation of the van der Waals interaction, also known as Casimir interaction when including retardation effects, constitutes a challenging task. We present…
The role of diffraction in the Casimir effect beyond the proximity force approximation
Vinicius Henning, Benjamin Spreng, Michael Hartmann +2
We derive the leading-order correction to the proximity force approximation (PFA) result for the electromagnetic Casimir interaction in the plane-sphere geometry by developing the…
Proximity force approximation and specular reflection: Application of the WKB limit of Mie scattering to the Casimir effect
Benjamin Spreng, Michael Hartmann, Vinicius Henning +2
The electromagnetic Casimir interaction between two spheres is studied within the scattering approach using the plane-wave basis. It is demonstrated that the proximity force approx…
Anomalies in the specific heat of a free damped particle: The role of the cutoff in the spectral density of the coupling
Benjamin Spreng, Gert-Ludwig Ingold, Ulrich Weiss
The properties of a dissipative system depend on the spectral density of the coupling to the environment. Mostly, the dependence on the low-frequency behavior is in the focus of in…
Reentrant classicality of a damped system
Benjamin Spreng, Gert-Ludwig Ingold, Ulrich Weiss
For a free particle, the coupling to its environment can be the relevant mechanism to induce quantum behavior as the temperature is lowered. We study general linear environments wi…