Abstract

Vortex beams carrying orbital angular momentum have attracted a great deal of attention over the past few years. An integrated vortex beam generator with high efficiency is desirable for wide-ranging applications. Here we demonstrate a highly efficient silicon photonic integrated vortex beam generator based on superposed holographic fork gratings. A metal mirror is used to enhance emission efficiency by reflecting the power leaking down to the substrate back to air. Experimental characterization confirms that the emission efficiency of the generator increases by ${\sim} 5\,{\rm dB}$. Moreover, the present device shows preferable features of broadband, polarization diversity, and compact footprint.

© 2020 Optical Society of America

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Corrections

Yuntao Zhu, Heyun Tan, Nan Zhou, Lifeng Chen, Jian Wang, and Xinlun Cai, "Compact high-efficiency four-mode vortex beam generator within the telecom C-band: publisher’s note," Opt. Lett. 45, 2127-2127 (2020)
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-45-7-2127

17 March 2020: A typographical correction was made to the author listing. A typographical correction was made to the funding section.

25 March 2020: A typographical correction was made to the abstract.


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