Open AccessDynamic shaping of orbital-angular-momentum beams for information encoding
Author(s) -
Xinyao Hu,
Qian Zhao,
Panpan Yu,
Xuanling Li,
Ziqiang Wang,
Yinmei Li,
Lei Gong
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.001796
Subject(s) - optics , angular momentum , encoding (memory) , wavefront , physics , multiplexing , holography , binary number , computer science , spatial light modulator , amplitude , modulation (music) , digital micromirror device , telecommunications , acoustics , arithmetic , mathematics , quantum mechanics , artificial intelligence
Shaping complex fields with a digital micromirror device (DMD) has attracted much attention recently due to its potential application in optical communication and microscopy. In this paper, we present an optimized Lee method to achieve dynamic shaping of orbital-angular-momentum (OAM) beams using a binary DMD. An error diffusion algorithm is introduced to enhance the accuracy for binary-amplitude hologram design, making it possible to achieve high fidelity wavefront shaping while retaining a high resolution. As a proof of concept, we apply this method to create different classes of OAM beams. The numerical simulations verify that a fidelity of F > 0.985 can be achieved for all the test OAM fields with fully independent phase and amplitude modulation. Moreover, we experimentally demonstrate the dynamic shaping of different OAM beams including pure modes and mixed modes with a switching rate of up to 17.8 kHz. On this basis, accurate information encoding into the generated multiplexed OAM beams is accomplished, which provides access to high speed classical and quantum communications that employ spatial mode encoding.