Dynamic nonlinear optical processes in some oxygen-octahedra ferroelectrics: first principle calculations
Yükleniyor...
Tarih
2015-10-29
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The nonlinear optical properties and electro-optic effects of some oxygen-octahedra ferroelectrics are studied by the density functional theory (DFT) in the local density approximation (LDA) expressions based on first principle calculations without the scissor approximation. We present calculations of the frequency- dependent complex dielectric function ? ? v and the second harmonic generation response coefficient x? ?2 ? ? ¡ 2v; v; v over a large frequency range in tetragonal and rhombohedral phases. The electronic linear electro-optic susceptibility x? ?2 ? ? ¡ v; v; 0 is also evaluated below the band gap. These results are based on a series of the LDA calculation using DFT. The results for x? ?2 ? ? ¡ v; v; 0 are in agreement with the experiment below the band gap and those for x? ?2 ? ? ¡ 2v; v; v are compared with the experimental data where available.
Açıklama
Anahtar Kelimeler
ABO3; ferroelectrics; nonlinear optic processes
Kaynak
WoS Q Değeri
Q4
Scopus Q Değeri
Q4
