Merge branch 'dev_photonics' into 'master'

logo_amu.jpg

logo_anr.png

logo_fresnel.jpg

photonics/Bloch-modes-in-periodic-waveguides_screenshot1.png

photonics/Bloch-modes-in-periodic-waveguides_screenshot2.png

photonics/Diffraction-gratings_screenshot1.png

photonics/NonLinearEVP.png

photonics/grating3D_skew.png

photonics/grating3D_solar.png

photonics/index.html

photonics/rhombus.png

photonics/scattering_splitring.png