Hybrid polarization grating for mode detection of vector beams

A hybrid polarization grating that can spatially separate orthogonal states of a vector beam with the same polarization topological charge is presented. The hybrid polarization grating is assembled using a fork-shaped polarization grating and a quarter-wave polarization grating and acts as a common...

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Veröffentlicht in:Optics express 2021-08, Vol.29 (17), p.27071-27083
Hauptverfasser: Sakamoto, Moritsugu, Kaneko, Yusuke, Kakedo, Yushi, Noda, Kohei, Sasaki, Tomoyuki, Tanaka, Masayuki, Sakai, Takeya, Hattori, Yukitoshi, Kawatsuki, Nobuhiro, Ono, Hiroshi
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Sprache:eng
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Zusammenfassung:A hybrid polarization grating that can spatially separate orthogonal states of a vector beam with the same polarization topological charge is presented. The hybrid polarization grating is assembled using a fork-shaped polarization grating and a quarter-wave polarization grating and acts as a common pass interferometer for right- and left-circular polarization components of incident vector beams. The hybrid polarization grating can separate two vector beam states that have a 90 ° relative polarization azimuth angle difference. The number of detectable vector beams can be increased by replacing the hybrid polarization grating with a crossed-hybrid polarization grating. Device feasibility was demonstrated experimentally using hybrid polarization grating and crossed-hybrid polarization grating fabricated using the photoalignment method for photoreactive liquid crystals. This approach has the potential to demultiplex several vector beams stably and simultaneously using a compact optical system and should be applicable to vector beam division multiplexing and other applications requiring vector beam detection.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.433998