3391 Periodic structures with linear defects have been traditionally analyzed with the ω(ï¿¿ k) methods with the supercell approximation. The presence of the linear defect introduces guided modes at frequencies in the band gap of the complete structure. This methodology only considers the propagating properties of the periodic system. In this work we report both theoretical predictions and expe...

Time dependent experiments with evanescent modes (photonic tunneling) can be performed with high precision and at a macroscopic scale with microwaves in the range of meters or in the infrared regime in the range of centimeters. The infrared technology is the present day digital signal processing and transmission. Superluminal (faster than light) signal transmission by evanescent modes was shown...

Compact, reusable chemical sensors are highly desirable for on-site detection in the field, including the identification of water contaminants, hazardous biochemical compounds, or blood serum content. Ideally, such a sensing platform should be portable, and employ several complementary sensing modalities that allow quantitative chemical identification of extremely small sample volumes. Optical ...

This article presents the concept of storing optical energy using a metallic air gap microcavity. Evanescent waves are stored in the air gap of a dielectric/metal/air gap/metal planar microcavity. For an air gap with a micron scale distance between the two metals, incident light excites the optical interface modes on the two metal-air interfaces simultaneously, being accompanied by enhanced eva...

Forces arising from overlap between the guided waves of parallel, microphotonic waveguides are calculated. Both attractive and repulsive forces, determined by the choice of relative input phase, are found. Using realistic parameters for a silicon-on-insulator material system, we estimate that the forces are large enough to cause observable displacements. Our results illustrate the potential for...

In several recent articles, we have investigated in some detail one-dimensional electrostatic potentials by means of both the Schrödinger [1–3] and the Dirac equation [4–6]. Several original phenomena have been observed, such as the transition from resonance phenomena to multiple (infinite) peak formation [5] equivalent to a shift from wave-like to particle behavior in the barrier diffusion zon...

In an evanescent wave magnetometer the Zeeman polarization is probed at micrometer to submicrometer distances from the cell surface. The electron paramagnetic resonance lines of an evanescent wave magnetometer in the presence of a magnetic field gradient exhibit edge enhancement seen previously in nuclear magnetic resonance lines. We present a theoretical model that describes quantitatively the...

We present the first photoelectron spectroscopy measurements of quantum dots (semiconductor nanocrystals) in the gas phase. By coupling a nanoparticle aerosol source to a femtosecond velocity map imaging photoelectron spectrometer, we apply robust gas-phase photoelectron spectroscopy techniques to colloidal quantum dots, which typically must be studied in a liquid solvent or while bound to a su...

Fresnel's theory of the evanescent wave in total reflection entails that the propagation vector k and the momentum quanta hk have an imaginary component and, thus, a projection on the reflecting plane that is larger (in units such that c = 1) than the angular frequency ~o and the energy quanta ho). We discuss the 'tachyon properties' of these energy-momentum quanta and propose an experimental t...

We quantize the angular momentum of the electromagnetic field in a linear medium. We consider the interaction of an atom with an evanescent wave. We discuss the transfer of angular momentum in such a wave in relation to some recent experiments.