Using a Complex Optical Orbital-Angular-Momentum Spectrum to Measure Object Parameters: A Spatial Domain Approach

Light beams can be characterized by their complex spatial profiles in both intensity and phase. Analogous to time signals, which can be decomposed into multiple orthogonal frequency functions, a light beam can also be decomposed into a set of spatial modes that are taken from an orthogonal basis. Su...

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Bibliographic Details
Published in:arXiv.org 2017-05
Main Authors: Xie, Guodong, Song, Haoqian, Zhao, Zhe, Milione, Giovanni, Ren, Yongxiong, Liu, Cong, Zhang, Runzhou, Bao, Changjing, Long, Li, Wang, Zhe, Pang, Kai, Starodubov, Dmitry, Tur, Moshe, Willner, Alan E
Format: Article
Language:English
Subjects:
Angular momentum
Decomposition
Diodes
Light beams
Noise levels
Spectrum analysis
Time signals
Online Access:Get full text
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Summary:Light beams can be characterized by their complex spatial profiles in both intensity and phase. Analogous to time signals, which can be decomposed into multiple orthogonal frequency functions, a light beam can also be decomposed into a set of spatial modes that are taken from an orthogonal basis. Such a decomposition can provide a tool for spatial spectrum analysis, which may allow the stable, accurate and robust extraction of physical object information that may not be readily achievable using traditional approaches. As an example, we measure the opening angle of an object using the complex spectrum of orbital angular momentum (OAM) modes as the basis, achieving a more than 15 dB signal-to-noise ratio. We find that the dip (i.e., notch) positions of the OAM intensity spectrum are dependent on an object's opening angle but independent of the object opening's angular orientation, whereas the slope of the OAM phase spectrum is dependent on the object opening's orientation but independent on the opening angle.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.09051