Using a complex optical orbital-angular-momentum spectrum to measure object parameters

Xie, Guodong; Song, Haoqian; Zhao, Zhe; Milione, Giovanni; Ren, Yongxiong; Liu, Cong; Zhang, Runzhou; Bao, Changjing; Li, Long; Wang, Zhe; Pang, Kai; Starodubov, D.S.; Lynn, Brittany; Tur, Moshe

doi:10.1364/ol.42.004482

Cited by 93 publications

(32 citation statements)

References 46 publications

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“…With recent advances in nanophotonics and nanofabrication, the precision of detection has reached the nanoscale, and VBs can be used for label-free single-molecule detection in metamaterials 287 . Recently, the OAM spectrum, acting as a new powerful tool, was used in optical detection, in which the difference between the OAM spectra of incident and outgoing light revealed the topography of the target 288 , as depicted in Fig. 19h.…”

Section: Advanced Applications Of Tunable Vbsmentioning

confidence: 99%

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Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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Thirty years ago, Coullet et al. proposed that a special optical field exists in laser cavities bearing some analogy with the superfluid vortex. Since then, optical vortices have been widely studied, inspired by the hydrodynamics sharing similar mathematics. Akin to a fluid vortex with a central flow singularity, an optical vortex beam has a phase singularity with a certain topological charge, giving rise to a hollow intensity distribution. Such a beam with helical phase fronts and orbital angular momentum reveals a subtle connection between macroscopic physical optics and microscopic quantum optics. These amazing properties provide a new understanding of a wide range of optical and physical phenomena, including twisting photons, spin–orbital interactions, Bose–Einstein condensates, etc., while the associated technologies for manipulating optical vortices have become increasingly tunable and flexible. Hitherto, owing to these salient properties and optical manipulation technologies, tunable vortex beams have engendered tremendous advanced applications such as optical tweezers, high-order quantum entanglement, and nonlinear optics. This article reviews the recent progress in tunable vortex technologies along with their advanced applications.

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Section: Advanced Applications Of Tunable Vbsmentioning

confidence: 99%

“…g Schematic diagram of the OAM conservation process in the high-harmonic generation of VBs 49 . h Schematic diagram of object detection using the OAM spectrum 288 . a From ref.…”

Section: Advanced Applications Of Tunable Vbsmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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“…OAM has enabled a variety of applications, such as micromanipulation [6], [7], imaging [8], [9], and sensing [10], [11]. The distinguishing feature of an OAM beam is that it has the helical phase front named as exp (ilθ) and discrete value of lη per photon, where θ refers to the azimuthal angle and η is Plank's constant.…”

Section: Introductionmentioning

confidence: 99%

Air-Core Ring Fiber With >1000 Radially Fundamental OAM Modes Across O, E, S, C, and L Bands

et al. 2020

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In this work, an air-core ring fiber is designed with a record high 1322 orbital angular momentum (OAM) modes at 1550 nm while maintaining radially single-mode condition. Moreover, it can support over 1004 OAM modes across all O, E, S, C, and L bands, exploiting to our knowledge the highest number of OAM modes ever supported in the optical fiber within a wide wavelength range. Simulations show that, across the C and L bands, the fiber with 55-µm air-core radius and 0.45-µm ring width can preserve 3.3 × 10 −3 effective refraction index difference between the two highest-order OAM modes HE 340,1 and EH 271,1. This enables efficient mode separation, and thus achieving stable OAM modes transmission. The effective refractive index differences between the even and odd fiber eigenmodes are also analyzed in the elliptical and bent fibers. We note that higher-order OAM modes are more tolerant to the fiber ellipticity and bending. This ring fiber design has the potential to increase the spectral efficiency and the overall capacity in fiber-based communications system. INDEX TERMS Orbital angular momentum, fiber optics, ring fiber, multiplexing.

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“…In general, Fig. 1(a) depicts the common concept of previously demonstrated object identification techniques using SLMs and power monitor [6]. In such systems, complex OAM spectrum analysis is needed to monitor rotation objects by acquiring additional phase information of the interrogated OAM beam.…”

Section: Conceptmentioning

confidence: 99%

Detecting Object Open Angle and Direction Using Machine Learning

et al. 2020

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Nowadays, the object detection techniques have been developed rapidly for different applications, ranging from remote sensing to autonomous vehicles. We demonstrate identification of object open angle and direction using machine learning (ML) algorithms based on received light beam's intensity profiles. Compared with previous optical orbital-angular-momentum (OAM) spectrum system and other related works, our proposed technique only uses a single-shot image, and can efficiently reduce the complexity of hardware implementation. Specifically, we verify the reliability of the simulation results experimentally for 14 open angles and 32 directions. Experimental result shows that convolutional neural network (CNN) outperforms the other traditional ML algorithms, such as decision tree (DT), k-nearest neighbor algorithm (KNN), and support vector machine (SVM). As one of the variant of CNN, MobileNet (MN) has relatively simplified iteration algorithm than VGG-like net. It reduces the computational power, while still maintaining high accuracy for identification issues.

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Using a complex optical orbital-angular-momentum spectrum to measure object parameters

Cited by 93 publications

References 46 publications

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Air-Core Ring Fiber With >1000 Radially Fundamental OAM Modes Across O, E, S, C, and L Bands

Detecting Object Open Angle and Direction Using Machine Learning

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