[2] [2] TEE D C, TAMCHEK N, SHEE Y G, et al. Numerical investigation on cascaded 1×3 photonic crystal power splitter based on asymmetric and symmetric 1×2 photonic crystal splitters designed with flexible structural defects[J]. Optics Express, 2014, 22(20): 24241-24255.

[3] [3] DIN C T, ADIKAN F R M, NIZAM T, et al. Efficient, Wide Angle, Structure Tuned 1×3 Photonic Crystal Power Splitter at 1550, nm for Triple Play Applications[J]. Journal of Lightwave Technology, 2012, 30(17): 2818-2823.

[4] [4] HUANG L, TIAN H, YANG D, et al. Optimization of figure of merit in label-free biochemical sensors by designing a ring defect coupled resonator[J]. Optics Communications, 2014, 332: 42-49.

[5] [5] PARK I, LEE H S, KIM H J, et al. Photonic crystal power-splitter based on directional coupling[J]. Optics Express, 2004, 12(15): 3599-3604.

[6] [6] YU T B, WANG M H, JIANG X Q, et al. Ultracompact and wideband power splitter based on triple photonic crystal waveguides directional coupler[J]. Journal of Optics A Pure & Applied Optics, 2007, 9(1): 37-42.

[9] [9] MAKTOOBI S, BAHADORI-HAGHIGHI S. Investigation and simulation of photonic crystal directional coupler switch[J]. Electronics Letters, 2015, 51(13): 1016-1018.

[10] [10] SHARMA J, SHARMA R, DUSADL K. Review and analysis of photonic crystal beam splitters for optical communication applications[C]// 2015 International Conference on Green Computing and Internet of Things (ICGCIoT), October 8-10, 2015, Greater Noida, Delhi, India. New York: IEEE, 2015: 160-162.