Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2003-08-26
2008-09-02
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S571000
Reexamination Certificate
active
07420734
ABSTRACT:
Diffraction gratings are formed from grooves each having a reflective facet and a non-reflective facet. The net reflection of TE (Transverse Electric) and TM (Transverse Magnetic) polarizations from the grating structure is traded off against the polarization dependent reflection, by controlling the degree of metallization of the reflective facet and by ensuring that there is no metallization of non-reflective sidewalls. other diffraction gratings are manufactured from trenches etched perpendicular to a waveguide. The trenches are metallized and back-filled with a filling material having a refractive index matched to that of the waveguide. The gratings essentially have no non-reflecting sidewalls with insignificant polarization influence from side walls.
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Balakrishnan Ashok
Dossou Kokou
Packirisamy Muthukumaran
Amari Alessandro
Senniger Powers LLP
Valorbec Societe En Commandite
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