Manipulating ellipsoidal micro-particles by femtosecond vortex tweezers

Liu, Changxia; Guo, Zhongyi; Li, Yan; Wang, Xinshun; Qu, Shiliang

doi:10.1088/2040-8978/17/3/035402

Cited by 37 publications

(19 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…And previous researches fully exploited the amplitude, phase [1], wavelength [2], polarization [3] and spatially distribution of light fields in FSO communication systems [4]. Since Allen et al discovered Laguerre-Gaussian (LG) beams with helical phase carrying orbital angular momentum (OAM) [5], which has attracted great researching attentions in generations [6], [7] and applications [8]- [10] of OAM beams. The LG beams…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Wang

Guo

2019

IEEE Access

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 99%

Section: B Performance Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Wang

Guo

2019

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…An optical vortex beam is a structured beam with a spiral phase e −ilϕ in the azimuthal direction ϕ perpendicular to the propagation direction [1][2][3]. These beams carrying an orbital angular momentum (OAM) of lℏ per photon have opened a route to many promising applications, such as optical communication [4][5][6][7][8], laser ablation [9][10][11][12] and micromanipulation [13][14][15]. These applications can benefit from technologies of optical vortex generation which can be divided into external modulation outside the cavity [16][17][18][19][20] and direct generation within the cavity [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

High-gain amplification for femtosecond optical vortex with mode-control regenerative cavity

et al. 2020

View full text Add to dashboard Cite

Ultra-intense femtosecond vortex pulses can provide an opportunity to investigate the new phenomena with orbital angular momentum (OAM) involved in extreme cases. This paper reports a high gain optical vortex amplifier for intense femtosecond vortex pulses generation. Traditional regeneration amplifiers can offer high gain for Gaussian mode pulses but cannot amplify optical vortex pulses while maintaining the phase singularity because of mode competition. Here, we present a regeneration amplifier with a ringshaped pump. By controlling the radius of the pump, the system can realize the motivation of LG0,1(-1) mode and the suppression of Gaussian mode. Without seeds, the amplifier has a donut-shaped output containing two opposite OAM states simultaneously, as our prediction by simulation. If seeded a pulse of a topologic charge of 1 or-1, the system will output an amplified LG0,1(-1) mode pulse with the same topologic charge as the seed. To our knowledge, this amplifier can offer the highest gain as 1.45×10 6 for optical vortex amplification. Finally, we obtain a 1.8 mJ, 51 fs compressed optical vortex seeded from a 2 nJ optical vortex.

show abstract

“…Electromagnetic waves scattered by nanoparticles has gained great attention because of its immense applications, including optical communications [1, 2], optical manipulations [3, 4], material science [5, 6], and so on. In general, scattering ordinarily relies on shape, size, and composition of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Forward Scattering of Ellipsoidal Dielectric Nanoparticles

Wang

Shen

et al. 2017

Nanoscale Res Lett

Self Cite

View full text Add to dashboard Cite

Dielectric nanoparticles can demonstrate a strong forward scattering at visible and near-infrared wavelengths due to the interaction of optically induced electric and magnetic dipolar resonances. For a spherical nanoparticle, the first Kerker’s condition within dipole approximation can be realized, where backward scattering can reach zero. However, for this type of dielectric sphere, maximum forward scattering without backward scattering cannot be realized by modulating the refractive index and particle size of this nanoparticle. In this paper, we have demonstrated that a larger directional forward scattering than the traditional spherical nanoparticle can be obtained by using the ellipsoidal nanoparticle, due to the overlapping electric and magnetic dipolar modes. For the oblate ellipsoid with a determined refractive index, there is an optimum shape for generating the suppressed backward scattering along with the enhanced forward scattering at the resonant wavelength, where the electric and magnetic dipolar modes overlap with each other. For the prolate ellipsoid, there also exist the overlapping electric and magnetic dipolar modes at the resonant wavelength of total scattering, which have much higher forward scattering than those for both oblate ellipsoid and sphere, due to the existence of the higher multipolar modes. Furthermore, we have also demonstrated the realization of the dimensional tailoring in order to make the strong forward scattering shift to the desired wavelength.

show abstract

Manipulating ellipsoidal micro-particles by femtosecond vortex tweezers

Cited by 37 publications

References 25 publications

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

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

High-gain amplification for femtosecond optical vortex with mode-control regenerative cavity

Enhanced Forward Scattering of Ellipsoidal Dielectric Nanoparticles

Contact Info

Product

Resources

About