Goos-h(?)nchen Shift Of Self-collimated Beam In New Kretschmann Configuration

In recent years, photonic crystals as a novel optical materials, which have beenproven in many unique and dispersion of observed phenomena, such as negativerefraction, super-prism effect, self-collimation effect and other exotic physicalphenomena. Goos-H nchen shift (GH) is a strange phenomenon which waswidespread attention in physics, materials science and other disciplines. Inconventional Kretschmann configuration, GH displacement generally occurs when thelight beam is totally reflected at interface of two dielectric and the Brewster conditionis match. However, the intensity of the reflected light beam is often weak and difficultto measurement due to the absorption loss in the configuration. A Kretschmannconfiguration composed of a dielectric waveguide between a photonic-crystal-madeprism and air was used to study the Goos-H nchen shift.Based on self-collimation effect, we have employed the FDTD simulations andPWM method to analyze a dual-beam-reflection phenomenon for a Gaussian beamilluminating at a Kretschmann configuration composed of a lossless dielectricwaveguide between a photonic-crystal-made prism and air. One reflection beam hasa small positive shift and the other has a large negative shift in thedual-beam-reflection phenomenon. Main contents and conclusions are as follows:1、The finite-difference time-domain shows that the specific phenomenon takesplace just when the corresponding leaky surface mode supported in the Kretschmannconfiguration is excited. Field profile of the surface mode demonstrates a stronglocalized stationary field in the dielectric waveguide. The positive displacement hasbeen reduced constantly with the index of the waveguide increases and the negativedisplacement firstly decreases and then decrease.2、We explore the change of Goos-H nchen shift with the change of dielectricwaveguide parameters in the phenomenon of dual-beam reflect. The series ofprojection energy band and mode distribution were calculate by using the plane waveexpansion method to analysis and interpretation of the physical reasons for thephenomenon of dual-beam reflection and the change Goos-H nchen shift.