Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide
Xue Fen Kan,
Zhi Xin Zou,
Cheng Yin,
Hui Ping Xu,
Xian Ping Wang,
Qing Bang Han,
Zhuang Qi Cao
Affiliations
Xue Fen Kan
College of Internet of Things Engineering, Hohai University, Changzhou 213022, China
Zhi Xin Zou
Changsha Lubang Photoelectric Technology Co., Ltd., Changsha 410023, China
Cheng Yin
College of Internet of Things Engineering, Hohai University, Changzhou 213022, China
Hui Ping Xu
National Electrical and Electronic Experimental Teaching Demonstration Center, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xian Ping Wang
Department of Physics, Jiangxi Normal University, Nanchang 330022, China
Qing Bang Han
College of Internet of Things Engineering, Hohai University, Changzhou 213022, China
Zhuang Qi Cao
Department of Physics and Astronomy, Shanghai JiaoTong University, Shanghai 200240, China
Goos-Hänchen shift provides a way to manipulate the transverse shift of an optical beam with sub-wavelength accuracy. Among various enhancement schemes, millimeter-scale shift at near-infrared range has been realized by a simple symmetrical metal-cladding waveguide structure owing to its unique ultrahigh-order modes. However, the interpretation of the shift depends crucially on its definition. This paper shows that the shift of a Gaussian beam is discrete if we follow the light peak based on the stationary phase approach, where the M-lines are fixed to specific directions and the beam profile is separated near resonance. On the contrary, continuous shift can be obtained if the waveguide is illuminated by a vortex beam, and the physical cause can be attributed to the position-dependent phase-match condition of the ultrahigh-order modes due to the spatial phase distribution.
