Back to Search
Start Over
Piezoelectric Field Enhanced Second-Order Nonlinear Optical Susceptibilities in Wurtzite GaN/AlGaN Quantum Wells
- Publication Year :
- 1999
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1999.
-
Abstract
- Second-order nonlinear optical processes including second-harmonic generation, optical rectification, and difference-frequency generation associated with intersubband transitions in wurtzite GaN/AlGaN quantum well (QW) are investigated theoretically. Taking into account the strain-induced piezoelectric (PZ) effects, we solve the electronic structure of the QW from coupled effective-mass Schrodinger equation and Poisson equation including the exchange-correlation effect under the local-density approximation. We show that the large PZ field in the QW breaks the symmetry of the confinement potential profile and leads to large second-order susceptibilities. We also show that the interband optical pump-induced electron-hole plasma results in an enhancement in the maximum value of the nonlinear coefficients and a redshift of the peak position in the nonlinear optical spectrum. By use of the difference-frequency generation, THz radiation can be generated from a GaN/Al(0.75)Ga(0.25)N with a pump laser of 1.55 micron.
- Subjects :
- Physics Of Elementary Particles And Fields
Subjects
Details
- Language :
- English
- Database :
- NASA Technical Reports
- Notes :
- RTOP 519-40-12, , NAS2-14303
- Publication Type :
- Report
- Accession number :
- edsnas.20000090552
- Document Type :
- Report