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On the spin-to-orbit momentum conversion operated by electric field in optically active Bi12GeO20 crystals

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Vasylkiv Yu., Krupych O., Skab I. and Vlokh R.

Abstract. An optical conversion of spin angular momentum to orbital angular momentum (SAM-to-OAM) that appears in Bi12GeO20 crystals under the effect of conically shaped external electric field due to a Pockels effect has been studied both experimentally and theoretically. We have revealed the appearance of a doughnut mode and an optical vortex in the system consisting of a right-handed circular polariser, a sample subjected to conical electric field, and a left-handed circular analyser. It has been found that the presence of natural optical activity leads to notable decrease in the efficiency of the SAM-to-OAM conversion.

Keywords: optical vortex, natural optical activity, Pockels effect, Bi12GeO20 crystals

PACS: 78.20.Jq, 42.50.Tx, 78.20.Ek
UDC: 535.542, 535.56
Ukr. J. Phys. Opt. 12 171-179
doi: 10.3116/16091833/12/4/171/2011
Received:  07.10.2011

Анотація.  В роботі експериментально та теоретично досліджено перетворення оптичного спінового кутового моменту в орбітальний кутовий момент (СКМ-ОКМ), яке виникало в кристалах Bi12GeO20 під дією зовнішнього конічного електричного поля, завдяки ефекту Покельса. Виявлено виникнення „бубликової” моди і оптичного вихора в системі, яка складалась з право обертаючого циркулярного поляризатора, зразка підданого дії конічного електричного поля і ліво обертаючого циркулярного аналізатора. Виявлено, що присутність природної оптичної активності приводить до суттєвого зменшення ефективності СКМ-ОКМ перетворення.
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