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Efficient materials for spin-to-orbit angular momentum conversion using bending technique

Vasylkiv Yu., Smaga I., Skab I. and Vlokh R.

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Abstract. We analyze the efficiency of different materials used for spin-to-orbit angular momentum conversion by applying bending to parallelepiped-shaped bars made of crystals or glasses. It is found that generation of pure screw dislocations of the light wave front with the bending technique is possible only in isotropic materials and crystals belonging to hexagonal and trigonal symmetries, with exception of crystals of the point symmetry groups    and 6/m. We demonstrate that lexan is the most efficient material for generating optical vortex beams that bear orbital angular momentum, using the bending technique. This material reveals the highest figure of merit,  =155.1*10-12m2/N.

Keywords: optical vortex, efficiency of SAM-to-OAM conversion, bending

PACS: 42.50.Tx, 42.70.-a, 78.20.hb
UDC: 535.5+535.012+535.55+539.384+517.951.5
Ukr. J. Phys. Opt. 14 200-209
doi: 10.3116/16091833/14/4/200/2013
Received: 10.09.2013

Анотація. У роботі проаналізовано ефективність різних матеріалів, які можна використовувати для спін-орбітального перетворення оптичного кутового моменту за допомогою згину балок у формі паралелепіпеда. Виявлено, що генерація чистої гвинтової дислокації хвильового фронту за методом згину можлива лише в ізотропних матеріалах і кристалах, що належать до гексагональних і тригональних сингоній, за винятком кристалів симетрійних груп   і 6/m. Показано, що лексан – це найефективніший матеріал для генерації оптичних вихорів, які переносять орбітальний кутовий момент, із застосуванням методу згину. Його коефіцієнт якості найвищий і дорівнює  =155.1*10-12m2/N.
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