Discrimination of orbital angular momentum modes of the terahertz vortex beam using a diffractive mode transformer

We present an efficient method to discriminate orbital angular momentum (OAM) of the terahertz (THz) vortex beam using a diffractive mode transformer. The mode transformer performs a log-polar coordinate transformation of the input THz vortex beam, which consists of two 3D-printed diffractive elemen...

Full description

Saved in:
Bibliographic Details
Published in:Optics express 2016-06, Vol.24 (12), p.12534-12541
Main Authors: Liu, Changming, Wei, Xuli, Niu, Liting, Wang, Kejia, Yang, Zhengang, Liu, Jinsong
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present an efficient method to discriminate orbital angular momentum (OAM) of the terahertz (THz) vortex beam using a diffractive mode transformer. The mode transformer performs a log-polar coordinate transformation of the input THz vortex beam, which consists of two 3D-printed diffractive elements. A following lens separates each transformed OAM mode to a different lateral position in its focal plane. This method enables a simultaneous measurement over multiple OAM modes of the THz vortex beam. We experimentally demonstrate the measurement of seven individual OAM modes and two multiplexed OAM modes, which is in good agreement with simulations.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.012534