The purpose of optical antennas is to convert the energy of free propagating radiation to localized energy, and vice versa. Although this is similar to what radio wave and microwave antennas do, optical antennas exploit the unique properties of metal nanostructures, which behave as strongly coupled plasmas at optical frequencies. It is hoped that optical antennas can increase the efficiency of ...

Gravitational-wave astronomy, together with precise pulsar timing and long baseline interferometry, is changing our ability to perform tests of fundamental physics astrophysical observations. Some these are based on electromagnetic probes or electrically charged bodies, assume an empty universe. However, the cosmos filled plasma, a dilute medium which prevents propagation low-frequency, small-a...

In this work, cobalt/polypyrrole (Co/PPy) nanocomposites were prepared via an in situ oxidation polymerization of pyrrole in an aqueous dispersion of Co nanoparticles (NPs). The Co/PPy nanocomposites showed good electromagnetic properties because of the coexistence of magnetic loss and dielectric loss to electromagnetic waves. The electromagnetic wave absorbing bandwidth (reflection loss < -10 ...

In this work we demonstrate enhancement of the fluorescence collection efficiency for chlorophyll-containing photosynthetic complexes deposited on SiO2 spherical nanoparticles. Microscopic images of fluorescence emission reveal ring-like emission patterns associated with chlorophyll-containing complexes coupled to electromagnetic modes within the silica nanoparticles. The interaction leaves no ...

Progress of clock frequency of digital equipments causes serious undesired emission from a printedcircuit board(PCB). Since a trial-and-error at later procedure spends cost and time, design criterion for low-emission PCB is desired. To establish the design criterion, it is necessary to understand mechanism of emission. For this purpose, many investigations on near-field measurement for estimati...

Transformation optics offers an unconventional approach to the control of electromagnetic fields. The transformation optical structures proposed to date, such as electromagnetic "invisibility" cloaks and concentrators, are inherently reflectionless and leave the transmitted wave undisturbed. Here, we expand the class of transformation optical structures by introducing finite, embedded coordinat...

We describe in detail the method for Particle-in cell/Monte-Carlo simulation of electron cyclotron resonance (ECR) discharges. In the simulation, electric and magnetic fields are obtained by solving Maxwell equations, and electrons and ions are accelerated by solving equations of motion. We consider two different cases: (i) propagation of electromagnetic wave in the presence of a constant exter...

Photonic crystals can affect the behavior of visible light, and other electromagnetic waves, in ways that are not possible by other means. The propagation of photons can be completely forbidden or the the light can be made to follow a welldefined path. Fluorescent emission can be enhanced for some wavelengths or completely shut off for others, and it is possible to do all this simultaneously in...