Biomedical subjects
Publications and source records attributed to van Tiggelen BA.
A theory is presented for propagation of waves in bounded media near the mobility edge, based on the self-consistent theory for localization. It predicts a spatially inhomogeneous diffusion constant that leads to scale dependence in enhanced backscattering and transmission.
This paper describes how coherent backscattering is altered by an external magnetic field. In the theory presented, magneto-optical effects occur inside Mie scatterers embedded in a nonmagnetic medium. Unlike previous theories based on pointlike scatterers, the decrease of coherent backscattering is obtained in a leading order of the magnetic field using rigorous Mie theory. This decrease is strongly enhanced in the proximity of resonances, which cause the path length of the wave inside a scatterer to be increased. Also presented is an analysis of the shape of the backscattering cone in a magnetic field.
We describe an experimental study of the photonic Hall effect in media consisting of a magneto-optically active matrix and magneto-optically inert Mie scatterers. We call such media reversed with respect to the normal media having magneto-optically active Mie scatterers in inert matrices in which the photonic Hall effect has been studied so far. We show the photonic Hall effect in reversed media to be proportional to VBl*, where V is the Verdet constant of the matrix, l(*) the transport mean free path of the liquid, and B the applied magnetic field. We further propose an empirical expression that unifies the results obtained in normal and reversed media and present a simple analytic model to illustrate the photonic Hall effect.
We describe an experimental and theoretical study of the effect of optical absorption on the photonic Hall effect in a passive matrix containing magnetoactive scatterers. We find that for the case of absorbing scatterers, the magnetotransverse light current changes sign and increases with increasing absorption. Good agreement is obtained with numerical calculations. For the case of an absorbing matrix, no effect was observed.
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