Planar polarization transformer
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United States of America Patent
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Jul 12, 2016
Grant Date -
May 29, 2014
app pub date -
May 31, 2012
filing date -
Jun 1, 2011
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Abstract
The planar polarization transformer for a normally incident optical wave or beam having a given vacuum wavelength λ comprises an optical planar grating between a cover medium of refractive index nc and an optical substrate of refractive index ns, this planar grating defining a binary index modulation or corrugation of substantially rectangular profile with periodic ridges. This polarization transformer is characterized in that the ridge refractive index nr is larger than the substrate refractive index ns, the grating period Λ is larger than 0.4·λ/nc, the substrate refractive index ns is smaller than 2.7·nc, and the index modulation or corrugation is designed such that, according to the grating mode dispersion equation, the effective index of the mode TE0 is larger than the substrate index ns and the effective index of the mode TM0 is larger than the cover refractive index and smaller than the substrate index.
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