Bistability and gap soliton in one-dimensional photonic crystal containing single-negative materials

• Published in: Physics letters. A Vol. 348; no. 3; pp. 424 - 431
• Main Authors: Wang, S.M., Tang, C.J., Pan, T., Gao, L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 02.01.2006
• Subjects: 61.72.-y; 42.65.Pc; 42.65.Tg
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2005.08.037

We study the nonlinear responses of the defect structure made up of the one-dimensional photonic crystal containing alternate single-negative layers with a nonlinear defect layer centered in the structure. The output intensity curves and transmission spectra with different nonlinear coefficients α and different incident angles are observed. To one's interest, it is found that the position of the transmission peak is almost invariant with the incident angle changing from 0° to 30°. The spatial distribution and the relative phase shift of the electric field in the defect structure are also studied. Solitons are founded in the electric field distribution. With different incident angles, the locations of the peaks and the maxima and minima of the solitons do not move. The only difference introduced from different incident angles is the amplitudes of the electric field at the same position. Similarly, we find the curves of the phase shift of the electric fields with different incident angles have the same shape, only the values at the same position are different from each other. At last, we also investigate the asymmetric nonlinear defect structure formed by changing the position of the defect layer. The similar insensitive characteristic to the incident angle in the transmission property, electric field distribution and relative phase shift are found.