Calculating the torque of the optical vortex tweezer to the ellipsoidal micro-particles

Zhu, Lingling; Guo, Zhongyi; Xu, Qiang; Zhang, Jingran; Zhang, Anjun; Wang, Wei; Yi, Lin; Li, Yudong; Wang, Xinshun; Qu, Shiliang

doi:10.1016/j.optcom.2015.05.062

Cited by 25 publications

(14 citation statements)

References 16 publications

(14 reference statements)

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“…The optical vortex beam has a helical wavefront and carries an orbital angular momentum of lℏ [ 37 , 38 ], which make it show great promises in high-resolution lithography [ 39 , 40 ], optical trapping [ 41 , 42 ], optical communication [ 43 , 44 ], and so on. Here, the topological charge l is the number of twists of the wavefront and ℏ is the reduced Planck constant.…”

Section: Resultsmentioning

confidence: 99%

High-Order Dielectric Metasurfaces for High-Efficiency Polarization Beam Splitters and Optical Vortex Generators

et al. 2017

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In this paper, a high-order dielectric metasurface based on silicon nanobrick array is proposed and investigated. By controlling the length and width of the nanobricks, the metasurfaces could supply two different incremental transmission phases for the X-linear-polarized (XLP) and Y-linear-polarized (YLP) light with extremely high efficiency over 88%. Based on the designed metasurface, two polarization beam splitters working in high-order diffraction modes have been designed successfully, which demonstrated a high transmitted efficiency. In addition, we have also designed two vortex-beam generators working in high-order diffraction modes to create vortex beams with the topological charges of 2 and 3. The employment of dielectric metasurfaces operating in high-order diffraction modes could pave the way for a variety of new ultra-efficient optical devices.

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Section: Resultsmentioning

confidence: 99%

High-Order Dielectric Metasurfaces for High-Efficiency Polarization Beam Splitters and Optical Vortex Generators

et al. 2017

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“…At the transmitter, the computer controlled digital signals to be transmitted is encoded onto the SLM where a series of phase holograms are loaded for modulating continuous incident Gaussian beams into corresponding LG beams carrying diverse OAMs (e.g. signals s = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 are mapped to OAM modes l = 1, 2, 3, 4, 5,6,7,8,9,10 ).…”

Section: The Principle Of Oam-fso Communication With Adaptive Demmentioning

confidence: 99%

“…For 4-ary OAM system, databases are divided into 4 classes with OAM modes l = 1, 4, 7, 10. Correspondingly, 8, 10 and 16 classes are respectively divided for 8-ary with l = 1, 3, 5, 7, 9, 11, 13, 15, 10-ary with l = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 16-ary OAM system with l = 1, 2, 3, 4, 5,6,7,8,9,10,11,12,13,14,15,16. Meanwhile, to compare performance under the same conditions, each of classes contains 200 images for training and 50 images for testing.…”

Section: B Performance Evaluationmentioning

confidence: 99%

Adaptive Demodulation Technique for Efficiently Detecting Orbital Angular Momentum (OAM) Modes Based on the Improved Convolutional Neural Network

Wang

Guo

2019

IEEE Access

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Convolutional neural network (CNN), as a model of deep learning (DL), has been widely applied to the field of computer vision as well as optical communication. In this paper, we focus on the adaptive demodulation technique in orbital angular momentum (OAM) free-space optical (FSO) communication system with the improved CNN. In order to achieve adaptive demodulation under free-space turbulence channel, the traditional CNN with our preliminary optimization methods has been firstly demonstrated. Then, in view of the relatively poor performance of traditional CNN for OAM modes demodulation under strong turbulence environment with long transmission distance, the network was deepened and the residual learning framework was used to solve the degradation problem. We have respectively investigated the performance of this improved CNN by testing the demodulation performance in 4-ary, 8-ary, 10-ary and 16-ary OAM systems, and analyzed the generalization ability of accommodating unknown turbulence environment by training the model with different training sets. The numerical simulation shows that the demodulation accuracy is about 100.0%, 99.5%, 99.2% and 99.0% respectively for 4-ary, 8-ary, 10-ary and 16-ary OAM systems over the 2000m free-space with strong turbulent level. And our improved CNN trained by a hybrid training set with several levels of turbulence can provide the model with stronger ability to accommodate more kinds of unknown turbulence environments. It is anticipated that these results might be helpful for improving the reliability of the OAM-FSO communication system in future. INDEX TERMS Orbital angular momentum, free-space optical communication, atmospheric turbulence, neural networks.

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“…Since orbital angular momentum (OAM)characteristics of the optical vortex beam was proposed by Allen et al in 1992, OAM has been substantially studied [1][2][3][4], which has been also expanded from optical regions to low-frequency radio domain [5,6]. The wavefront of an electromagnetic (EM) wave carrying OAM rotates around the transmission axis.…”

Section: Introductionmentioning

confidence: 99%

An Inner- and Outer-Fed Dual-Arm Archimedean Spiral Antenna for Generating Multiple Orbital Angular Momentum Modes

et al. 2019

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Orbital angular momentum (OAM) beams have attracted great attention owing to their excellent performances in imaging and communication. In this paper, a dual-arm Archimedean spiral antenna (DASA) is proposed to generate multiple OAM states with positive and negative values by feeding at the inner and outer ends, respectively. The topological charge of radiated vortex waves is reconfigurable by tuning the operating frequency. Dual-mode OAM states are generated at different working frequencies (l = ±1 at 3 GHz, l = ±2 at 4 GHz, and l = ±3 at 4.8 GHz). Both the simulation and measurement results demonstrate that OAM beams can be generated effectively by the DASA. In addition, a conical cavity is used to increase the gain of the proposed DASA for more than 5 dBi in comparison to the traditional cylindrical cavity. Furthermore, the qualities of the generated OAM modes by the proposed DASA have been evaluated at different operating frequencies of 3 GHz, 4 GHz, and 4.8 GHz, respectively. The OAM modes purities of l = −1, −2, −3, 1, 2, and 3 are predominate with the proportion of about 81%, 70%, 74%, 78%, 77%, and 75%, respectively. Our results demonstrate that the proposed DASA has great potentials in OAM multiplexing communication systems.

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Calculating the torque of the optical vortex tweezer to the ellipsoidal micro-particles

Cited by 25 publications

References 16 publications

High-Order Dielectric Metasurfaces for High-Efficiency Polarization Beam Splitters and Optical Vortex Generators

High-Order Dielectric Metasurfaces for High-Efficiency Polarization Beam Splitters and Optical Vortex Generators

Adaptive Demodulation Technique for Efficiently Detecting Orbital Angular Momentum (OAM) Modes Based on the Improved Convolutional Neural Network

An Inner- and Outer-Fed Dual-Arm Archimedean Spiral Antenna for Generating Multiple Orbital Angular Momentum Modes

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