Dielectric waveguides are the structures that are used to confine and guide the light in the guided-wave devices and circuits of integrated optics. This chapter is devoted to the theory of these waveguides. Other chapters of this book discuss their fabrication by such techniques as sputtering, diffusion, ion implantation or epitaxial growth. A wellknown dielectric waveguide is, of course, the o...

We show time-resolved measurement of Raman gain in Silicon submicron-size planar waveguide using picosecond pump and probe pulses. A net nonlinear gain of 6 dB is obtained in a 7-mm long waveguide with 20.7-W peak pump power. We demonstrate an ultrafast all-optical switch based on the free-carrier dispersion effect in the silicon waveguide, whose transmission is enhanced by more than 13 dB due ...

We present a new approach to fabricate three-dimensional (3D) dye-sensitized solar cells (DSSCs) by integrating planar optical waveguide and nanowires (NWs). The ZnO NWs are grown normally to the quartz slide. The 3D cell is constructed by alternatively stacking a slide and a planar electrode. The slide serves as a planar waveguide for light propagation. The 3D structure effectively increases t...

We present a general approach for coupling a specific mode in a planar photonic crystal (PC) waveguide to a desired free-space mode. We apply this approach to a W1 PC waveguide by introducing small index perturbations to selectively couple a particular transverse mode to an approximately Gaussian, slowly diverging free space mode. This "perturbative photonic crystal waveguide coupler" (PPCWC) e...

The beam deflection of a guided mode in a planar optical waveguide is analyzed. The deflexion is caused by a gradual change in the depth of the waveguide that is transversal to its propagation direction. The beam deflection angle could be modulated by a change in the refractive index at the surface layer of the waveguide. We present numerical results to evaluate the deflexion in the case of a g...

In this paper we outline a simple procedure to obtain an equivalent z-invariant waveguide for a given graded index segmented waveguide. In particular, the proposed model is shown to predict accurately the modal spot size and the effective indices of the fundamental and the first higher order modes of a planar parabolic-index segmented waveguide over the entire range of duty cycles. The result s...

This paper presents a novel planar matching load for travelingwave-fed substrate integrated waveguide (SIW) slot arrays. The load consists of a planar grounded coplanar waveguide (GCPW) matching load and a planar GCPW to SIW transition which makes the GCPW matching load compatible with the SIW. In the GCPW matching load a high frequency resistor is used to dissipate the remaining power. A trave...

We report first observation of net-gain from an optical parametric amplifier in a planar waveguide. This was achieved in a low-loss As(2)S(3) planar waveguide, with a strong nonlinearity (gamma approximately 10 /W/m) and tailored anomalous dispersion yielding efficient Raman-assisted four-wave mixing at telecom wavelengths. The experiments were in good agreement with theory, and indicate a peak...

The basic shape structures are designed at frequency 2.4 GHz based on radiating structure 5 and 5.2 GHz based on radiating structure 3. The frequency bands that have been chosen are based on the IEEE standards. Then both structures are combined to achieve dual band resonant. The techniques that have been used are by designing the 3.5 shaped by using microstrip, planar and coplanar waveguide str...

We argue that the planar optical waveguide is the geometry of choice for observing electromagnetic Stark ladders.