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High-Throughput Continuous Beam Steering Using Rotating Polarization Gratings

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5 Author(s)
Chulwoo Oh ; Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, CA, USA ; Jihwan Kim ; Muth, J. ; Serati, S.
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A new beam steering concept comprising independently rotating, inline polarization gratings (PGs) is experimentally demonstrated. The approach, which we term Risley gratings, achieves high steering throughput within a large field-of-regard (FOR) in a fashion similar to Risley prisms, composed of wedged prisms. However, because PGs are patterned in thin liquid crystal layers, they enable a system with far less thickness, weight, and beam walk-off. Furthermore, large apertures are feasible and wavelengths from visible to infrared can be chosen. Any direction within a solid angle defined by twice the diffraction angle of each PG can be addressed mechanically. Here we demonstrate a Risley grating system with a 62?? FOR and 89%-92% transmittance at 1550-nm wavelength, using two PGs with 6-??m grating period.

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Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 4 )