首页|Piezoelectric lattice vibrations in GaN at optical frequencies
Piezoelectric lattice vibrations in GaN at optical frequencies
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NSTL
Elsevier
At optical frequency range, lattice vibrations in piezoelectric crystal are associated with ionic polarizations. A relationship is formulated, based on classical dispersion theory, involving the dielectric constant (epsilon(jj)) and the piezoelectric coefficient (d(jj)) of wurtzite GaN. The relation is utilized to investigate the piezoelectric lattice vibrations in GaN at optical frequency, and a close agreement between the computed and the experimental value of d(jj) is found. The study reveals that applications of piezoelectric nature of GaN could be extended to optical frequencies to generate phase coherent acoustic phonons to modulate thermal conduction. At optical frequencies there are no direct experimental methods exist at present for measurement of d(jj); however, the proposed relation can help to determine d(jj) from infrared reflection measurements.