141 citations · 254 across the 14 of their papers we have counts for
14 papers
Power flow in a small electromagnetic energy harvesting system excited by mechanical motion
Lars Egil Helseth
In this study the power flow in a coupled mechanical and electromagnetic harvesting system in presence of both positional and electrical fluctuations is analyzed. Explicit expressi…
Under which conditions is quantum brownian motion observable in a microscope?
Lars Egil Helseth
We investigate under which conditions we can expect to observe quantum brownian motion in a microscope. Using the fluctuation-dissipation theorem, we investigate quantum brownian m…
General method for focusing of waves using phase and amplitude compensation
Lars Egil Helseth
A general method for focusing of waves, based on phase and amplitude compensation, is applied to monochromatic, polychromatic and diffusive waves. Monochromatic waves may form spat…
Tight focusing of polychromatic waves using angular spectrum compensation in spatially dispersive media
Lars Egil Helseth
A general method for tight focusing of waves, based on compensation of the angular spectrum, is established. We apply the method to monochromatic, polychromatic and diffusive waves…
Anomalous interaction between vortices and nanomagnets
Lars Egil Helseth
We study a thin film system consisting of a superconducting and a magnetic film, where the superconductor contains a vortex and the magnetic film a nanomagnet. We find that if the…
Vortex interactions in presence of a soft magnetic film
Lars Egil Helseth
We study theoretically the behavior of vortices in a thin film superconductor placed close to a soft magnetic film. It is shown that the field from the vortex induces a magnetizati…