Abstract
Interaction between light and dipole allowed excitons results in coupled propagation modes known as excitonic polaritons.1 Recently, the excitonic polaritons in quantum well waveguides have been investigated by picosecond time-of-flight measurement.2 In this quantum well waveguide, the exciton and light fields are independently confined in the quantum well and core of the waveguide. It is, therefore, particularly interesting that the coupling between the exciton and light fields can be artificially controlled by varying the sizes of the quantum well and core. This inevitably leads to an extended coherence length of the excitonic polariton.
© 1990 Optical Society of America
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