A new achromatic phase retarder based on a metal-multilayer dielectric grating structure is designed using the rigorous coupled wave analysis method and the genetic algorithm. The optimized phase retarder can maintain...A new achromatic phase retarder based on a metal-multilayer dielectric grating structure is designed using the rigorous coupled wave analysis method and the genetic algorithm. The optimized phase retarder can maintain phase retardation around 90°from 900 nm to 1200 nm, and the maximum deviation is less than 4.5% while the diffraction efficiencies of TE and TM waves are both higher than 95%. Numerical analysis shows the designed phase retarder has a high fabrication tolerance of groove depth, duty cycle and incident angle. This achromatic phase retarder is simple in design and stable in performance, and can be widely used in optical systems.展开更多
A compact tunable guided-mode resonant filter （GMRF） in the telecommunication region near the 1550 nm wave-length is proposed in this paper. Particle swarm optimization （PSO） is used to design the GMRF. The tunabi...A compact tunable guided-mode resonant filter （GMRF） in the telecommunication region near the 1550 nm wave-length is proposed in this paper. Particle swarm optimization （PSO） is used to design the GMRF. The tunability of the GMRF is achieved by an MEMS-based physical movement （in the horizontal or vertical direction） combined with an incident angle in a certain range. The results show that the resonant wavelength tuning of 110 nm （140mm） is obtained by horizontal movement of 168 nm （vertical movement of 435 nm） combined with an about 11° variation of incident angle.展开更多
基金the National Natural Science Foundation of China(Grant No.11274188)
文摘A new achromatic phase retarder based on a metal-multilayer dielectric grating structure is designed using the rigorous coupled wave analysis method and the genetic algorithm. The optimized phase retarder can maintain phase retardation around 90°from 900 nm to 1200 nm, and the maximum deviation is less than 4.5% while the diffraction efficiencies of TE and TM waves are both higher than 95%. Numerical analysis shows the designed phase retarder has a high fabrication tolerance of groove depth, duty cycle and incident angle. This achromatic phase retarder is simple in design and stable in performance, and can be widely used in optical systems.
基金Project supported by the National High-Tech Research and Development Program of China(Grant No.2011 AA050518)
文摘A compact tunable guided-mode resonant filter （GMRF） in the telecommunication region near the 1550 nm wave-length is proposed in this paper. Particle swarm optimization （PSO） is used to design the GMRF. The tunability of the GMRF is achieved by an MEMS-based physical movement （in the horizontal or vertical direction） combined with an incident angle in a certain range. The results show that the resonant wavelength tuning of 110 nm （140mm） is obtained by horizontal movement of 168 nm （vertical movement of 435 nm） combined with an about 11° variation of incident angle.
