棱镜-薄膜耦合结构中光束Goos-H(a)nchen位移的增强

棱镜-薄膜耦合结构是单侧镀电介质膜的双棱镜结构中的一种,在光信号传输方面具有十分重要的作用.利用稳态相位法分析了这种结构中反射和透射光束的Goos-Hanchen位移,研究结果表明,反射和透射光束的Goos-Hanchen位移随薄膜厚度或入射角的增大除出现共振峰外,还存在反射光束的Goos-Hanchen位移共振峰为负值的新现象.在共振点处透射和反射光束的正向或负向位移量最大可达百余波长.这一结构中薄膜和入射角.对光束Goos-Hanchen位移的调制在设计新型光位移调制和光传感器件中具有潜在的应用.

Enhancement of Goos-H(a)nchen Shift in Prism-Film Coupling Configuration

Prism-film coupling configuration is a two-prism configuration with one prisms coated with a thin dielectric film. This structure plays an important role in the field of optical signal transmission. The Goos-Hnchen (G-H) shift of reflected and transmitted light beams in this configuration is theoretically investigated by stationary-phase approach. The result shows that the G-H shifts of both the reflected and transmitted light beams oscillate with the increase of the thickness of the thin dielectric film and the angle of incidence. The resonant peaks of reflection G-H shift can be negative as well as positive. The magnitude of the resonant G-H shifts can reach two orders of the wavelength. The above property of the G-H shift modulation may lead to potential applications in new types of optical sensors and devices.