Study on tunable filtering performance of compound defect photonic crystal with magnetic control

• Published in: Optik (Stuttgart) Vol. 126; no. 24; pp. 5353 - 5356
• Main Authors: Ying, Chen, Jing, Dong, Jia, Shi, Qiguang, Zhu, Weihong, Bi
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01.12.2015
• Subjects: Magneto-optic effect; Photonic crystal; Tunable filtering; Tunneling effect; Tunneling effect; Tunable filtering; Magneto-optic effect; Photonic crystal
• ISSN: 0030-4026; 1618-1336
• DOI: 10.1016/j.ijleo.2015.09.094

Based on the total reflection tunneling effect of the one-dimensional (1-D) photonic crystal, the multi-channel filter structure is proposed, in which SiO2–ferrite–TiO2 structure layer is introduced into the photonic crystal as the compound defect. The total reflection tunneling phenomena is analyzed using the transfer matrix method, and the influence on the tunneling mode by the number of compound defect, the number of the periodical structure layer, the optical thickness of the defect layer, and the variation of magnetic intensity are discussed, respectively. The magneto-optical properties of the ferrite defect layer are analyzed and the changing regularity of the transmission spectrum for the photonic crystal is obtained with the modulation of the external magnetic field. The simulation results show that the number of tunneling modes is corresponding to the number of the compound defects, and the full width with half magnitude (FWHM) of the tunneling modes will be narrowed with the increase of the number for the compound defects and the quality factor can attain to 1974.9, which can achieve ultra-narrowband multi-channel filtering. When the external magnetic intensity changes, the transmission spectrum will shift with the sensitivity of 198.7nm/RIU. The photonic crystal filter is compact in structure and has perfect tunability, which can provide some theoretical references for the design of high Q value and tunable multi-channel photonic crystal filters.