Abstract

We study analytically, within a continuous field model, and numerically, on lattices containing ${10}^{5}$ spins, the integral absorption of microwaves by random-anisotropy magnet, $\ensuremath{\int}d\ensuremath{\omega}P(\ensuremath{\omega})$. It scales as ${D}_{R}^{2}/J$ strength ${D}_{R}$ ferromagnetic exchange $J$ in low-anisotropy amorphous magnetic materials. At high anisotropy materials s...

Emission linewidths of quantum dot photonic-crystal-slab nanocavities are measured as a function of temperature and fabrication parameters with low-power and high-power, cw and pulsed, nonresonant excitation. The cavity linewidth is dominated by the absorption of the ensemble of quantum dots having a density of 400/ m2; above the absorption edge, the cavity linewidth broadens considerably compa...

In this proceeding, we use optical modeling and detailed balance analysis to predict the limiting efficiency of nanostructured silicon solar cells based on vertically-aligned nanowire and nanohole arrays. We first use the scattering matrix method to study broadband optical absorption. By incorporating the calculated optical absorption into a detailed balance analysis, we obtain the limiting sho...

In a superconductor, absorption of photons with an energy below the superconducting gap leads to redistribution of quasiparticles over energy and thus induces a strong nonequilibrium quasiparticle energy distribution. We have measured the electrodynamic response, quality factor, and resonant frequency of a superconducting aluminium microwave resonator as a function of microwave power and temper...