Thank you very much Le mer. 5 déc. 2018 à 06:36, Gavin Abo <gs...@crimson.ua.edu> a écrit :
> I believe: > > delta_n=n_zz-n_xx > > However, you may check it for yourself: > > Birefringence := delta_n=n_e-n_o [1,2] > > Orthorhombic ɛ_xx and ɛ_yy perpendicular and ɛ_zz parallel [3] a bit > similar to tetragonal that has ɛ_xx = ɛ_yy and ɛ_zz tensor (Table 1.1) [4] > > n_x = sqrt(ɛ_xx/ɛ_o) and n_z = sqrt(ɛ_zz/ɛ_o) [5,6] > > Section 1.4 of [4]: > > n_e = n_z (or n_zz) and n_o = n_x (or n_xx) > [1] https://en.wikipedia.org/wiki/Birefringence#Uniaxial_materials > [2] > http://shodhganga.inflibnet.ac.in/bitstream/10603/4722/13/13_chapter%203.pdf > (Equation 3.24) > [3] https://pubs.acs.org/doi/abs/10.1021/jp410786w > [4] > http://www.physics.ucc.ie/fpetersweb/FrankWeb/courses/PY4118/Notes/Symmetry%20of%20Tensor%202.pdf > [5] https://www.as-photonics.com/book_page/book-preview.pdf (Equations > 2.13 and 2.15) > [6] > https://nanoed.tul.cz/pluginfile.php/1598/mod_resource/content/1/Optick%C3%A9%20vlastnosti%20krystal%C5%AF.pdf > (slide 5) > > > On 12/4/2018 5:54 PM, Wien2k User wrote: > > Dear Wien2k users; > > for a tetragonal material, the birefringence is given by : > delta_n=n_xx-n_zz > or > delta_n=n_zz-n_xx > > _______________________________________________ > Wien mailing list > Wien@zeus.theochem.tuwien.ac.at > http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien > SEARCH the MAILING-LIST at: > http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html >
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