Negative Refraction, Wave-particle Dualism and “Minkowski-Abraham controversy”
19 Nov 2012 | Online Presentations | Contributor(s): Victor G. Veselago
Professor Veselago was the first to identify that the relationships between energy and linear momentum are significantly different for electromagnetic radiation and material particles. The process of transfer of radiation from the emitter to the receiver will be discussed. It is shown that the mass transferred by radiation is not always associated with portable energy by Einstein's relation E = mc2. A more general relation has the form E = mVphVgr and includes the dependence on the phase and group velocities of the radiation. This relation implies that in case of a negative refractive index, when the phase and group velocities are in opposite directions, the mass is transferred from the receiver to the source, but not vice versa, as usual. It is also shown that the Abraham-Minkowski controversy may be resolved on the basis of the wave-corpuscular duality.
Negative Refraction, Light Pressure and Attraction, Equation E=mc2 and Wave-particle Dualism
24 Feb 2011 | Online Presentations | Contributor(s): Victor G. Veselago
The process of transfer of radiation from the emitter to the receiver is considered. It is shown that the mass transferred by radiation is not always associated with portable energy by Einstein's relation E = mc ^ 2.
Some Remarks to Electrodynamics of Materials with Negative Refraction
26 Jun 2007 | Online Presentations | Contributor(s): Victor G. Veselago
The negative refraction coefficient n < 0 can be introduced for isotropic materials with anti-parallel directions of phase and group velocities. If some of material can be described by negative n it will have also negative values of both (electrical ε and magnetic μ) permeabilities. In materials with negative refraction coefficient, the realization of many physical laws is unusual. For example, in the case n < 0, the refracted beam in Snellius law is situated simmetrically with one for the case of positive n. Some other examples will be discussed among them is the very interesting flat lens, which can be used in so called “optical tweezers”. The discovery of negative refraction materials poses a very important question – to what extent are all the laws and formulas of electrodynamics, optics and related technical sciences valid, when n is negative? Can we always simply change the sign n → - n as, for example, in Snellius law? Generally speaking, the answer to this question is negative. Many laws and equations of electrodynamics and optics correspond to the case of non-magnetic materials with permeability μ = 1. This non-magnetic approach leads to many formulas that drastically change for the case μ ≠ 1, especially for μ < 0. For example, if one substitutes negative n into Fresnel equations, the results will be wrong. Special table, which outlines the situation, will be given in the talk. In the talk, some examples of negative refaction materials will be discussed and their properties and possible applications. The negative refraction phenomena can be observed not only in materials with negative value of n, ε and μ, but in many substances, which cannot be described by these values. So, this sort of refraction presents in anysotropic crystals. These materials are described by tensor, not scalar values of n, ε and μ. The other, very important example of negative-refraction materials are called photonic crystals. The main difference between photonic crystals and materials with negative n, ε and μ, is the relation between wavelength λ and lattice constant a in materials with negative refraction coefficient λ > a, but in photonic crystals a ≥ λ. So, materials with negative refraction coefficient can be described on the base of harmonic oscillation equation, but photonic crystals – on the base of Blokh, or Mattiew equations. The phenomenology of this two sort of materials is in many cases similar, but physics background is different. This talk will include discussion of the problem of estimation of pressure of light in LHM materials.
Victor Veselago Interview on Nanotechnology and Photonics
26 Jun 2007 | Online Presentations | Contributor(s): Victor G. Veselago, Phillip Fiorini
Nanotechnology and photonics interview with Phillip Fiorini.