Nonlinearity induced critical coupling.
We study a critically coupled system [Opt. Lett. 32, 1483 (2007)] with a Kerr nonlinear spacer layer. Nonlinearity is shown to inhibit null scattering in a critically coupled system at low powers. However, a system detuned from critical coupling can exhibit near-complete suppression of scattering by means of nonlinearity-induced changes in refractive index. Our studies reveal clearly an important aspect of critical coupling as a delicate balance in both the amplitude and the phase relations, while a nonlinear resonance in dispersive bistability concerns only the phase.
School of Physics, University of Hyderabad, Hyderabad, India.
K
K
Nireekshan Reddy
Achanta Venu
AV
Gopal
S
S
Dutta Gupta