凝聚态光物理学2.ppt

文档介绍：:birefringence2渭似暗压灾忠标冬靡瘦阐绅伤朋鸽触胰池旋帽逛厅配寇泞焊鞍枕蜀握他铂凝聚态光物理学2凝聚态光物理学2Chapter2ClassicalpropagationModel:Light:icwaveAtomandmolecule:classicaldipoleoscillatorn(),()Twopropagationparameters:n,:(atomic);=0,resonantabsorption(Beer’slaw)h=E2-E1re-radiatedphoton–luminesceradiationlesstransitionIf0,non-resonant,transparentTheoscillatorsfollowthedrivingwave,,leadingtosmallervelocitythaninfreespace(v=c/n).--(anionicopticalmedium)InfraredspectralregionInacrystallinesolidformthecondensationofpolarmolecules,theseoscillationsareassociatedwithlatticevibrations(phonons).,Ks=0,0=0Drude-:Solution;Thegives:With:ThemacroscopicpolarizationofmediumP:TheelectricdisplacementD::highfrequency:ThusClosetoresonance:o,半宽=;1的极值位于o,1出现负值;折射率在o区间出现反常色散。-