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Fabrication of a material with a complete photonic bandgap is a huge scientific challenge. For this reason photonic materials are being extensively studied. Many different kinds of systems in which the rate of spontaneous emission is modified by the environment are reported, including cavities, two, [ 10 ] [ 11 ] and three-dimensional [ 12 ...
When the material is introduced at the position of maximum electric field, then the contribution of magnetic field to perturbed frequency shift is very small and can be ignored. In this case, we can use perturbation theory to derive expressions for real and imaginary components of complex material permittivity ϵ r = ϵ r ′ + j ϵ r ...
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The resonant interaction is between free electrons and bound electrons at the surface of a material. Charged particles can be accelerated by resonant interaction with electromagnetic waves. [ 15 ] Scalar particles (neutral atoms) described by the Klein–Gordon equation can be accelerated by gravitational waves ( e.g. those emitted from black ...
However, resonance can also be detrimental, leading to excessive vibrations or even structural failure in some cases. [3] All systems, including molecular systems and particles, tend to vibrate at a natural frequency depending upon their structure; this frequency is known as a resonant frequency or resonance frequency.
It is a classical, phenomenological model for materials with characteristic resonance frequencies (or other characteristic energy scales) for optical absorption, e.g. ionic and molecular vibrations, interband transitions (semiconductors), phonons, and collective excitations. [1] [2]
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Muon Spin Resonance basic principle (Musr) Muon spin spectroscopy, also known as μSR, is an experimental technique based on the implantation of spin-polarized muons in matter and on the detection of the influence of the atomic, molecular or crystalline surroundings on their spin motion.