AUTHORS:

Nguyen H.T., Switkowski K., Filipkowski A., Kasztelanic R., Pysz D., Lef H.V., Stepien R., Krolikowski W., Buczynski R.

ABSTRACT:

Novel fiber microprobe comprising a nanostructured gradient index optical vortex phase mask and single-mode fiber was investigated numerically and experimentally. The mask which, consists of spatially distributed sub-wavelength nanorods, was fabricated via the modified stack-and-draw fiber drawing technique. The mask has flat input and output surfaces and transverse dimensions of a standard single-mode fiber. The microprobe allows efficient generation of high-quality optical vortex beams in different environments such as air and water.

Optics Communications, 2020, vol. 477, art. 126345, doi: 10.1016/j.optcom.2020.126345