Slow light in metal–insulator–metal waveguide by negative Goos–Hänchen shift

We demonstrated group velocity delay using a metal–insulator–metal structure for slow light that would be very simple to fabricate. A negative Goos–Hänchen shift of the surface plasmon resonance can be caused by incident radiation while reflecting, resulting in a general group delay. Using this phenomenon, we induced a group delay of 70 fs using a very simple 20-μm-long waveguide.