A Millimeter-Wave Photonic Crystal Laser
Final rept. 1 Jul 1997-30 Sep 2001
DUKE UNIV DURHAM NC DEPT OF PHYSICS
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Ultrasmall optical pumped far infrared laser cavities were constructed using defect cavities in a purely dielectric photonic crystal. Microwave measurements were performed on scale model photonic crystals to understand the performance of the cavities as a function of cavity size, isolation, and dielectric loss. In addition, continuous wave and ultrafast optical measurements of wide bandgap semiconductors were performed. Refractive indices were measured for AlGaN comprehensively for the first time. Measurements of conduction band offsets of AlGaN were attempted. The electron capture time in InGaN multiple quantum well laser structure was found to be approximately 0.5 Ps when electrons are optically injected near the barrier band edge. Coherent oscillations of zone folded longitudinal acoustic phonons were observed, and the means for their generation were studied. Finally, these phonons were coherently controlled, and complete cancellation of optically generated acoustic phonons was demonstrated for the first time.
- Lasers and Masers