A compact T-branch beam splitter based on anomalous reflection in two-dimensional photonic crystals

• 作 者: 沈义峰 孙建 沈晓鹏 王娟 孙露露 韩奎 王国中
• 机 构: Department of Physics,China University of Mining and Technology,Department of Physics,China Universi
• 出 处: Chinese Optics Letters
• 发表日期: 2008年10期
• 关键词: splitter photonic branch anomalous vertex directions normalized unchanged split

We project a compact T-branch beam splitter with a micron scale using a two-dimensional(2D)photonic crystal(PC).For TE polarization,one light beam can be split into two sub-beams along opposite directions. The propagating directions of the two splitting beams remain unchanged when the incident angle varies in a certain range.Coupled-mode theory is used to analyze the truncating interface structure in order to investigate the energy loss of the splitter.Simulation results and theoretical analysis show that choosing an appropriate location of the truncating interface(PC-air interface)is very important for obtaining high efficiency due to the effect of defect modes.The most advantage of this kind of beam splitter is being fabricated and integrated easily.

We project a compact T-branch beam splitter with a micron scale using a two-dimensional (2D) photonic crystal (PC) .For TE polarization, one light beam can be split into two sub-beams along opposite directions. The propagating directions of the two splitting beams remain unchanged when the incident angle varies in a certain range. Coupled-mode theory is used to analyze the truncating interface structure in order to investigate the energy loss of the splitter. Simulation results and theoretical analysis show that that choose an appropriate location of the truncating interface (PC-air interface) is very important for obtaining high efficiency due to the effect of defect modes.The most advantage of this kind of beam splitter is being fabricated and integrated easily.