• Diversos trabalhos futuros ainda s˜ao necess´arios para a conclus˜ao deste trabalho com a finalidade de caracterizar redes de Bragg volum´etricas. Entre elas:
• Investigar a condic¸˜oes necess´arias para as estruturas operarem como guias de onda de Bragg;
• Realizar gravac¸˜oes com outros valores de gravac¸˜ao, m´ascaras de fase;
• Ampliar a an´alise da relac¸˜ao dos dados de gravac¸˜ao com o comportamento dos CCs na VBG;
• Utilizar as VBGs em LiF em aplicac¸˜oes como seletor de comprimento de onda, de forma a verificar a longevidade e outros usos.
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ANEXO A -- TABELAS DE GRUPOS DE SIMETRIA
Tabela 14: Grupo de ponto D2hreferente ao CC F2. D2h E C2(z) C2(y) C2(x) i σ(xy) σ(xz) σ(yz) Func¸˜oes
lineares, rotac¸˜oes Func¸˜oes quadr´aticas Func¸˜oes c´ubicas Ag 1 1 1 1 1 1 1 1 - x2, y2, z2 - B1g 1 1 -1 -1 1 1 -1 -1 Rz xy - B2g 1 -1 1 -1 1 -1 1 -1 Ry xz - B3g 1 -1 -1 1 1 -1 -1 1 Rx yz - Au 1 1 1 1 -1 -1 -1 -1 - - xyz B1u 1 1 -1 -1 -1 -1 1 1 z - z3, y2z, x2z B2u 1 -1 1 -1 -1 1 -1 1 y - yz2, y3, x2y B3u 1 -1 -1 1 -1 1 1 -1 x - xz2, xy2, x3
Fonte: Gelessus et al. (1995)
Tabela 15: Grupo de ponto C3v referente ao CC F3+. C3v E 2C3(z) σ3v Func¸˜oes lineares, rotac¸˜oes Func¸˜oes quadr´aticas Func¸˜oes c´ubicas A1 1 1 1 z x2+ y2, z2 z3, x(x2− 3y2), z(x2+ y2) A2 1 1 -1 Rz - y(3x2− y2)
E +2 -1 0 (x, y)(Rx, Ry) (x2− y2, xy)(xz, yz) (xz2, yz2) [xyz, z(x2− y2)]
[x(x2+ y2), y(x2+ y2)]