Estudo das propriedades de transmissão de canais acoplados através do Método de Contorno de Paredes

Abstract

In the last few decades, quantum engineering has experienced substantial progresses. One of the biggest challenges is not only to fabricate micro and nanosized systems, but also to develop new designs that allow them to performe predefined tasks. Among these systems, the couplers play an important role in electronics, in particular as energy switching devices. In the present work, we provide a numerical study of a structure composed of coupled waveguides, which are structures that direct wave propagation and switch energy pulses. Among the various theoretical methods by which the transmission characteristics of couplers can be investigated, there are those based on the scattering technique. Here, we study the behavior of the proposed system by the boundary wall method (BWM) to calculate the quantum scattering state by barriers with arbitrary boundary conditions. The study of the behavior of the system was carried out by the analysis of the matrix T, the main object of the BWM. It possesses the characteristic of capturing information regarding the energy and geometry of the problem, and thus can provide us with a simple way to probe indirectly the energy distribution as a function of the coupler geometry. We determined the transmission spectrum for the case of input power through a single channel. We found that the transmission resonance wavelengths depend mainly on the width of the input and output channels. Finally, we explore the geometric properties of the coupler (slope and size of the channels). We unveil that the switching of the resonant transmission modes to different output channels can be controlled by tunning the geometry of the coupler.