Invited Article: Direct phase mapping of broadband Laguerre-Gaussian metasurfaces

journal article in Web of Science

English

We report on the fabrication of metasurface phase plates consisting of gold nanoantenna arrays that generate Laguerre-Gaussian modes from a circularly polarized Gaussian input beam. The corresponding helical phase profiles with radial discontinuities are encoded in the metasurfaces by the orientation of the nanoantennas. A commonpath interferometer is used to determine the orbital angular momentum of the generated beams. Additionally, we employ digital holography to record the detailed phase profiles of the Laguerre-Gaussian modes. This method allows a simple and direct quantitative comparison of the measured phase profiles of the generated Laguerre-Gaussian beams with the theoretically expected phase profiles. Experiments with different laser sources demonstrate the broadband operation of the metasurfaces

Gaussian distribution, Nanoantennas

FAßBENDER, A.; BABOCKÝ, J.; DVOŘÁK, P.; KŘÁPEK, V.; VAN DER LINDEN, S.

1. 11. 2018

AIP Publishing

2378-0967

APL Photonics

3

11

United States of America

110803-1

110803-7

7

http://dx.doi.org/10.1063/1.5049368

http://hdl.handle.net/11012/85365