polarization filter, subwavelength gratings, wire grid polarizer
We have stacked subwavelength gratings (SWGs) on a single substrate to create a compact, integrated circular polarization filter. The SWGs consist of a wire grid polarizer and a broadband form-birefringent quarter-wave plate (QWP). Rigorous coupled-wave analysis was used to design the QWP for operation over the 3.5-5.0 m wavelength range. The fabricated silicon broadband QWP exhibited a phase retardance of 82-97° across this wavelength range. Two stacked structures are presented, each with a different wire grid polarizer fabricated on an organic planarization layer (SU-8) that is deposited on a QWP grating. Transmittance measurements of the first structure when illuminated with nominally right- and left-circularly polarized light indicate a circular extinction ratio (CER) limited by the low linear extinction ratio of the polarizer. Use of a wire grid polarizer with a higher extinct ratio led to a stacked SWG structure that demonstrated CERs of 10-45 across the 3.5-5.0 m wavelength range.
Original Publication Citation
P. C. Deguzman and G. P. Nordin, "Stacked Subwavelength Gratings as Circular Polarization Filters," Appl. Opt. 4(31), pp. 5731-5737 (21)
BYU ScholarsArchive Citation
Nordin, Gregory P. and Deguzman, P. C., "Stacked Subwavelength Gratings as Circular Polarization Filters" (2001). Faculty Publications. 1084.
Optical Society of America
Ira A. Fulton College of Engineering and Technology
Electrical and Computer Engineering
© 2001 Optical Society of America
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