Abstract

We have studied room-temperature optical gating of ~5 ps pulses in GaAs/AlAs microresonators with diameters ranging from <0.5 μm to 1.5 μm by using a high-refractive-index lens system having a numerical aperture of 1.3. The larger devices show well-defined transverse modes and waveguide dispersion having fair agreement with calculations. The former effect causes decreased modulation of the probe beam. The smallest-diameter devices (<0.5 μm) show higher modulation, fully recover in <30 ps, and have their peak transmission wavelengths shifted by >500 Å compared to a large ~ 10 μm region.

© 1989 Optical Society of America