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Bronte Ciriza D, Magazzù A, Callegari A, Barbosa G, Neves AAR, Iatì MA, Volpe G, Maragò OM. Faster and More Accurate Geometrical-Optics Optical Force Calculation Using Neural Networks. ACS PHOTONICS 2023; 10:234-241. [PMID: 36691426 PMCID: PMC9853855 DOI: 10.1021/acsphotonics.2c01565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Indexed: 06/17/2023]
Abstract
Optical forces are often calculated by discretizing the trapping light beam into a set of rays and using geometrical optics to compute the exchange of momentum. However, the number of rays sets a trade-off between calculation speed and accuracy. Here, we show that using neural networks permits overcoming this limitation, obtaining not only faster but also more accurate simulations. We demonstrate this using an optically trapped spherical particle for which we obtain an analytical solution to use as ground truth. Then, we take advantage of the acceleration provided by neural networks to study the dynamics of ellipsoidal particles in a double trap, which would be computationally impossible otherwise.
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Affiliation(s)
| | | | - Agnese Callegari
- Department
of Physics, University of Gothenburg, SE-41296Gothenburg, Sweden
| | - Gunther Barbosa
- Universidade
Federal do ABC, Av. dos Estados 5001, CEP 09210-580, Santo André, SP, Brazil
| | - Antonio A. R. Neves
- Universidade
Federal do ABC, Av. dos Estados 5001, CEP 09210-580, Santo André, SP, Brazil
| | | | - Giovanni Volpe
- Department
of Physics, University of Gothenburg, SE-41296Gothenburg, Sweden
| | - Onofrio M. Maragò
- CNR-IPCF, Istituto per i Processi Chimico-Fisici, I-98158Messina, Italy
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Vitali V, Nava G, Zanchetta G, Bragheri F, Crespi A, Osellame R, Bellini T, Cristiani I, Minzioni P. Integrated Optofluidic Chip for Oscillatory Microrheology. Sci Rep 2020; 10:5831. [PMID: 32242060 PMCID: PMC7118116 DOI: 10.1038/s41598-020-62628-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 03/05/2020] [Indexed: 11/24/2022] Open
Abstract
We propose and demonstrate an on-chip optofluidic device allowing active oscillatory microrheological measurements with sub-μL sample volume, low cost and high flexibility. Thanks to the use of this optofluidic microrheometer it is possible to measure the viscoelastic properties of complex fluids in the frequency range 0.01-10 Hz at different temperatures. The system is based on the optical forces exerted on a microbead by two counterpropagating infrared laser beams. The core elements of the optical part, integrated waveguides and an optical modulator, are fabricated by fs-laser writing on a glass substrate. The system performance is validated by measuring viscoelastic solutions of aqueous worm-like micelles composed by Cetylpyridinium Chloride (CPyCl) and Sodium Salicylate (NaSal).
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Affiliation(s)
- Valerio Vitali
- University of Pavia, Dept. of Electrical, Computer and Biomedical Engineering, Pavia, 27100, Italy
| | - Giovanni Nava
- University of Milano, Dept. of Medical Biotechnology and Translational Medicine, Milano, 20129, Italy
| | - Giuliano Zanchetta
- University of Milano, Dept. of Medical Biotechnology and Translational Medicine, Milano, 20129, Italy
| | - Francesca Bragheri
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR), Milano, 20133, Italy
| | - Andrea Crespi
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR), Milano, 20133, Italy
- Dipartimento di Fisica, Politecnico di Milano, Milano, 20133, Italy
| | - Roberto Osellame
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR), Milano, 20133, Italy
- Dipartimento di Fisica, Politecnico di Milano, Milano, 20133, Italy
| | - Tommaso Bellini
- University of Milano, Dept. of Medical Biotechnology and Translational Medicine, Milano, 20129, Italy
| | - Ilaria Cristiani
- University of Pavia, Dept. of Electrical, Computer and Biomedical Engineering, Pavia, 27100, Italy
| | - Paolo Minzioni
- University of Pavia, Dept. of Electrical, Computer and Biomedical Engineering, Pavia, 27100, Italy.
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Yang M, Wu Y, Ren KF, Sheng X. Computation of radiation pressure force exerted on arbitrary shaped homogeneous particles by high-order Bessel vortex beams using MLFMA. OPTICS EXPRESS 2016; 24:27979-27992. [PMID: 27906365 DOI: 10.1364/oe.24.027979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Due to special characteristics of nondiffraction and self reconstruction, the Bessel beams have attracted wide attention in optical trapping and appear to be a dramatic alternative to Gaussian beams. We present in this paper an efficient approach based on the surface integral equations (SIE) to compute the radiation pressure force (RPF) exerted on arbitrary shaped homogeneous particles by high-order Bessel vortex beam (HOBVB). The incident beam is described by vector expressions perfectly satisfy Maxwell's equations. The problem is formulated with the combined tangential formulation (CTF) and solved iteratively with the aid of the multilevel fast multipole algorithm (MLFMA). Then RPF is computed by vector flux of the Maxwell's stress tensor over a spherical surface tightly enclosing the particle and analytical expression for electromagnetic fields of incident beam in near region are used. The numerical predictions are compared with the results of the rigorous method for spherical particle to validate the accuracy of the approach. Some numerical results on relative large particles of complex shape, such as biconcave cell-like particles with different geometry parameters are given, showing powerful capability of our approach. These results are expected to provide useful insights into the RPF exerted on complex shaped particles by HOBVB.
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Palima D, Bañas AR, Vizsnyiczai G, Kelemen L, Aabo T, Ormos P, Glückstad J. Optical forces through guided light deflections. OPTICS EXPRESS 2013; 21:581-593. [PMID: 23388951 DOI: 10.1364/oe.21.000581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Optical trapping and manipulation typically relies on shaping focused light to control the optical force, usually on spherical objects. However, one can also shape the object to control the light deflection arising from the light-matter interaction and, hence, achieve desired optomechanical effects. In this work we look into the object shaping aspect and its potential for controlled optical manipulation. Using a simple bent waveguide as example, our numerical simulations show that the guided deflection of light efficiently converts incident light momentum into optical force with one order-of-magnitude improvement in the efficiency factor relative to a microbead, which is comparable to the improvement expected from orthogonal deflection with a perfect mirror. This improvement is illustrated in proof-of-principle experiments demonstrating the optical manipulation of two-photon polymerized waveguides. Results show that the force on the waveguide exceeds the combined forces on spherical trapping handles. Furthermore, it shows that static illumination can exert a constant force on a moving structure, unlike the position-dependent forces from harmonic potentials in conventional trapping.
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Affiliation(s)
- Darwin Palima
- DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark.
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Ambrosio LA, Hernández-Figueroa HE. Radiation pressure cross sections and optical forces over negative refractive index spherical particles by ordinary Bessel beams. APPLIED OPTICS 2011; 50:4489-4498. [PMID: 21833125 DOI: 10.1364/ao.50.004489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
When impinged by an arbitrary laser beam, lossless and homogeneous negative refractive index (NRI) spherical particles refract and reflect light in an unusual way, giving rise to different scattered and internal fields when compared to their equivalent positive refractive index particles. In the generalized Lorenz-Mie theory, the scattered fields are dependent upon the Mie scattering coefficients, whose values must reflect the metamaterial behavior of an NRI scatterer, thus leading to new optical properties such as force and torque. In this way, this work is devoted to the analysis of both radial and longitudinal optical forces exerted on lossless and simple NRI particles by zero-order Bessel beams, revealing how the force profiles are changed whenever the refractive index becomes negative.
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Affiliation(s)
- Leonardo A Ambrosio
- Department of Microwave and Optics, School of Electrical and Computer Engineering, University of Campinas (Unicamp), Campinas, São Paulo, Brazil.
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Ambrosio LA, Hernández-Figueroa HE. Gradient forces on double-negative particles in optical tweezers using Bessel beams in the ray optics regime. OPTICS EXPRESS 2010; 18:24287-24292. [PMID: 21164774 DOI: 10.1364/oe.18.024287] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Gradient forces on double negative (DNG) spherical dielectric particles are theoretically evaluated for v-th Bessel beams supposing geometrical optics approximations based on momentum transfer. For the first time in the literature, comparisons between these forces for double positive (DPS) and DNG particles are reported. We conclude that, contrary to the conventional case of positive refractive index, the gradient forces acting on a DNG particle may not reverse sign when the relative refractive index n goes from |n|>1 to |n|<1, thus revealing new and interesting trapping properties.
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Affiliation(s)
- Leonardo A Ambrosio
- School of Electrical and Computer Engineering (FEEC), University of Campinas (Unicamp), Department of Microwave and Optics (DMO), 13083-970–Campinas/SP, Brazil.
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Ambrosio LA, Hernández-Figueroa HE. Fundamentals of negative refractive index optical trapping: forces and radiation pressures exerted by focused Gaussian beams using the generalized Lorenz-Mie theory. BIOMEDICAL OPTICS EXPRESS 2010; 1:1284-1301. [PMID: 21258549 PMCID: PMC3018122 DOI: 10.1364/boe.1.001284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 10/13/2010] [Accepted: 10/17/2010] [Indexed: 05/30/2023]
Abstract
Based on the generalized Lorenz-Mie theory (GLMT), this paper reveals, for the first time in the literature, the principal characteristics of the optical forces and radiation pressure cross-sections exerted on homogeneous, linear, isotropic and spherical hypothetical negative refractive index (NRI) particles under the influence of focused Gaussian beams in the Mie regime. Starting with ray optics considerations, the analysis is then extended through calculating the Mie coefficients and the beam-shape coefficients for incident focused Gaussian beams. Results reveal new and interesting trapping properties which are not observed for commonly positive refractive index particles and, in this way, new potential applications in biomedical optics can be devised.
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