A pump–probe optical switching mechanism that uses a nonlinear chiral photonic bandgap structure is proposed. The switching is achieved by shifting the bandgap of the structure; the chirality permits the use of the same frequency for the pump and the probe beam. The pump beam is never transmitted, so there is no discrimination problem. A new extension of the finite-difference time-domain technique is developed to simulate the propagation of an electromagnetic wave in a Kerr nonlinear chiral medium.
© 1999 Optical Society of America
P. Tran, "All-optical switching with a nonlinear chiral photonic bandgap structure," J. Opt. Soc. Am. B 16, 70-73 (1999)