In this paper we propound a non­destructive and non­invasive technique for measuring the thickness of water penetration in a homogeneous slab. The proposed device consists of a 252 Cf spontaneous fission source and a set of 3 He detectors located on the same side of a concrete slab subject to water infiltration. The effectiveness of this technique has been investigated by Monte Carlo simulation...

We photoexcite slab polymer waveguides doped with J-aggregating dye molecules and measure the leaky emission from strongly coupled waveguide exciton polariton modes at room temperature. We show that the momentum of the waveguide exciton polaritons can be controlled by modifying the thickness of the excitonic waveguide. Nonresonantly pumped excitons in the slab excitonic waveguide decay into tra...

We present a three-dimensional finite-difference time-domain analysis of localized defect modes in an optically thin dielectric slab that is patterned with a two-dimensional array of air holes. The symmetry, quality factor, and radiation pattern of the defect modes and their dependence on the slab thickness are investigated. © 1999 Optical Society of America [S0740-3224(99)01302-8] OCIS codes: ...

where is the angular frequency and F/m is the dielectric constant c of vacuum. The contribution of the bulk conductivity ( ) have been here separated to any other sort of losses ( ). The problem of the electromagnetic scattering due to a dielectric slab is briefly introduced. To this aim the model shown in Fig. 1 is considered: a unit amplitude wave is incident on a dielectric slab of thick...

We introduce a technique to measure transparent glass slab thickness. It employs a very simple setup combining two interferometers: a forward-going beam scheme and a self-mixing readout of the beam reflected back to the laser source. Interestingly, the difference of the two readouts provides a quantity related to thickness measurement, irrespective of refractive index. We demonstrate this metho...

A theoretical analysis of slab motion during camber evolution in unrestricted horizontal rolling is presented. The analysis shows that a linear relationship exists between centre-line deviation (CLD) curvature and outgoing camber, which is a function of ingoing and outgoing slab thickness and ingoing slab camber. An experimental study, undertaken during commercial rolling at the hot stripmill i...

The optical properties of slab waveguides made of indefinite permittivity (ε) materials (IEMs) are considered. In this medium, the real part of the transverse permittivity is negative while that of the longitudinal permittivity is positive. At any given frequency, the IEM waveguide supports an infinite number of transverse magnetic (TM) eigenmodes. For a slab waveguide with a fixed thickness, a...

Negative-index metamaterials (NIMs) exhibit highly unusual optical properties and promise a great variety of unprecedented applications. However, strong optical absorption inherent to such materials imposes severe limitation on such applications. The possibility to overcome this obstacle was proposed based on the coherent energy transfer from the control field to the signal through three-wavemi...