@article{Volpe2023,

title = {Roadmap for optical tweezers},

author = {Giovanni Volpe and Onofrio M Maragò and Halina Rubinsztein-Dunlop and Giuseppe Pesce and Alexander B Stilgoe and Giorgio Volpe and Georgiy Tkachenko and Viet Giang Truong and Síle Nic Chormaic and Fatemeh Kalantarifard and Parviz Elahi and Mikael Käll and Agnese Callegari and Manuel I Marqués and Antonio A. R. Neves and Wendel L Moreira and Adriana Fontes and Carlos L Cesar and Rosalba Saija and Abir Saidi and Paul Beck and Jörg S Eismann and Peter Banzer and Thales F D Fernandes and Francesco Pedaci and Warwick P Bowen and Rahul Vaippully and Muruga Lokesh and Basudev Roy and Gregor Thalhammer-Thurner and Monika Ritsch-Marte and Laura Pérez García and Alejandro V Arzola and Isaac Pérez Castillo and Aykut Argun and Till M Muenker and Bart E Vos and Timo Betz and Ilaria Cristiani and Paolo Minzioni and Peter J Reece and Fan Wang and David McGloin and Justus C Ndukaife and Romain Quidant and Reece P Roberts and Cyril Laplane and Thomas Volz and Reuven Gordon and Dag Hanstorp and Javier Tello Marmolejo and Graham D Bruce and Kishan Dholakia and Tongcang Li and Oto Brzobohatý and Stephen H Simpson and Pavel Zemánek and Felix Ritort and Yael Roichman and Valeriia Bobkova and Raphael Wittkowski and Cornelia Denz and G V Pavan Kumar and Antonino Foti and Maria Grazia Donato and Pietro G Gucciardi and Lucia Gardini and Giulio Bianchi and Anatolii V Kashchuk and Marco Capitanio and Lynn Paterson and Philip H Jones and Kirstine Berg-Sørensen and Younes F Barooji and Lene B Oddershede and Pegah Pouladian and Daryl Preece and Caroline Beck Adiels and Anna Chiara De Luca and Alessandro Magazzù and David Bronte Ciriza and Maria Antonia Iatì and Grover A Swartzlander},

url = {https://iopscience.iop.org/article/10.1088/2515-7647/acb57b/meta},

doi = {10.1088/2515-7647/acb57b},

issn = {2515-7647},

year  = {2023},

date = {2023-04-01},

urldate = {2023-04-01},

journal = {J. Phys. Photonics},

volume = {5},

number = {2},

publisher = {IOP Publishing},

abstract = {Optical tweezers are tools made of light that enable contactless pushing, trapping, and manipulation of objects, ranging from atoms to space light sails. Since the pioneering work by Arthur Ashkin in the 1970s, optical tweezers have evolved into sophisticated instruments and have been employed in a broad range of applications in the life sciences, physics, and engineering. These include accurate force and torque measurement at the femtonewton level, microrheology of complex fluids, single micro- and nano-particle spectroscopy, single-cell analysis, and statistical-physics experiments. This roadmap provides insights into current investigations involving optical forces and optical tweezers from their theoretical foundations to designs and setups. It also offers perspectives for applications to a wide range of research fields, from biophysics to space exploration.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kincaid2023,

title = {Methods of Mode Generation Inside Hollow Core Photonic Crystal Fibers},

author = {Peter Seigo Kincaid and Alessandro Porcelli and Ennio Arimondo and Antonio A. R. Neves and Andrea Camposeo and Dario Pisignano and Donatella Ciampini},

url = {https://www.ingentaconnect.com/content/ince/incecp/2023/00000265/00000002/art00024},

doi = {10.3397/in_2022_0755},

issn = {0736-2935},

year  = {2023},

date = {2023-02-01},

urldate = {2023-02-01},

journal = {inter noise},

volume = {265},

number = {2},

pages = {5186--5192},

publisher = {Institute of Noise Control Engineering (INCE)},

abstract = {Microspheres trapped inside Hollow Core Photonic Crystal Fibers (HCPCF) could provide a way to monitor the temperature in hydrogen combustors, thereby helping to provide a warning system for flashback and thermoacoustic oscillations that can lead to expensive combustor damage. The temperature of a particle trapped in a HCPCF may be extracted by the analysis of the particles' motion, which can be in turn controlled by opportune manipulation of the spatial intensity profile of the light in HCPCF. To this aim, an intermodal beating intensity pattern may be created inside the HCPCF using a mixture of LP01 and LP11 modes. In this work, methods of generating the optical modes, which involve the use of spatial light shaping techniques, are presented and analysed. This is an important step to producing a controllable intermodal beating pattern.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Suarez2023,

title = {Optical trapping with higher-order frozen waves},

author = {Rafael A. B. Suarez and Antonio A. R. Neves and Marcos R. R. Gesualdi},

url = {https://opg.optica.org/josab/abstract.cfm?uri=josab-40-3-631},

doi = {10.1364/josab.473922},

issn = {1520-8540},

year  = {2023},

date = {2023-00-00},

urldate = {2023-00-00},

journal = {J. Opt. Soc. Am. B},

volume = {40},

number = {3},

publisher = {Optica Publishing Group},

abstract = {In this work, we optically trap micro-particles with higher-order frozen waves using holographic optical tweezers. Frozen waves are diffraction-resistant optical beams obtained by superposing co-propagating Bessel beams with the same frequency and order, obtaining efficient modeling of its shape. Based on this, we developed a holographic optical tweezers system for the generation of frozen waves, and with this, it was possible to create traps in a stable way for the trapping and guiding of micro-particles in the transverse plane. The experimental results show that it is possible to obtain an excellent stability condition for optical trapping using higher-order frozen waves. These results indicate that frozen waves are promising for optical trapping and guiding of particles, which may be useful in various applications such as biological research, atomic physics, and optical manipulations using structured light with orbital angular momentum.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{BronteCiriza2022,

title = {Faster and More Accurate Geometrical-Optics Optical Force Calculation Using Neural Networks},

author = {David Bronte Ciriza and Alessandro Magazzù and Agnese Callegari and Gunther Barbosa and Antonio A. R. Neves and Maria Antonia Iatì and Giovanni Volpe and Onofrio M. Maragò},

url = {https://pubs.acs.org/doi/full/10.1021/acsphotonics.2c01565},

doi = {10.1021/acsphotonics.2c01565},

issn = {2330-4022},

year  = {2022},

date = {2022-12-19},

urldate = {2023-01-18},

journal = {ACS Photonics},

volume = {10},

number = {1},

pages = {234--241},

publisher = {American Chemical Society (ACS)},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kincaid2022,

title = {Size-dependent optical forces on dielectric microspheres in hollow core photonic crystal fibers},

author = {Peter Seigo Kincaid and Alessandro Porcelli and Antonio A. R. Neves and Ennio Arimondo and Andrea Camposeo and Dario Pisignano and Donatella Ciampini},

url = {https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-14-24407&id=477144},

doi = {10.1364/oe.458674},

issn = {1094-4087},

year  = {2022},

date = {2022-00-00},

urldate = {2022-00-00},

journal = {Opt. Express},

volume = {30},

number = {14},

publisher = {Optica Publishing Group},

abstract = {Optical forces on microspheres inside hollow core photonic crystal fibers (HC-PCFs) are often predicted using a ray optics model, which constrains its validity based on wavelength and microsphere sizes. Here, we introduce a rigorous treatment of the electromagnetic forces based on the Lorenz-Mie theory, which involves analytical determination of beam shape coefficients for the optical modes of a HC-PCF. The method is more practicable than numerical approaches and, in contrast with ray optics models, it is not limited by system size parameters. Time of flight measurements of microspheres flying through the HC-PCF lead to results consistent with the Lorenz-Mie predictions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Suarez2021,

title = {Optical trapping with non-diffracting Airy beams array using a holographic optical tweezers},

author = {Rafael A.B. Suarez and Antonio A. R. Neves and Marcos R.R. Gesualdi},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0030399220313116},

doi = {10.1016/j.optlastec.2020.106678},

issn = {0030-3992},

year  = {2021},

date = {2021-03-00},

urldate = {2021-03-00},

journal = {Optics & Laser Technology},

volume = {135},

publisher = {Elsevier BV},

abstract = {In this work, we present the experimental optical trap of microparticles with an Airy beams array using holographic optical tweezers. The Airy beams array is attractive for optical manipulation of particles owing to their non–diffracting and autofocusing properties. An Airy beams array is composed of N Airy beams which accelerate mutually and symmetrically in opposite direction, for different ballistic trajectories, that is, with different initial launch angles. Based on this, we developed a holographic optical tweezers system for the generation of non–diffracting beams and with it, we investigate the distribution of optical forces acting on microparticles of an Airy beams array. The results show that the gradient and scattering force on microparticles can be controlled through a launch angle parameter of Airy beams. In addition, it is possible to obtain greater stability for optical trap using an Airy beams array, with interesting possibilities for trapping and guiding of microparticles in a controllable way that can be applied in optical, biological, and atmospheric sciences.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Neves2021,

title = {Toward Waveguide-Based Optical Chromatography},

author = {Antonio A. R. Neves and Wendel L. Moreira and Adriana Fontes and Tijmen G. Euser and Carlos L. Cesar},

url = {https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2020.603641/full},

doi = {10.3389/fphy.2020.603641},

issn = {2296-424X},

year  = {2021},

date = {2021-02-08},

urldate = {2021-02-10},

journal = {Front. Phys.},

volume = {8},

publisher = {Frontiers Media SA},

abstract = {We report analytical expressions for optical forces acting on particles inside waveguides. The analysis builds on our previously reported Fourier Transform method to obtain Beam Shape Coefficients for any beam. Here we develop analytical expressions for the Beam Shape Coefficients in cylindrical and rectangular metallic waveguides. The theory is valid for particle radius a ranging from the Rayleigh regime to large microparticles, such as aerosols like virus loaded droplets. The theory is used to investigate how optical forces within hollow waveguides can be used to sort particles in “optical chromatography” experiments in which particles are optically propelled along a hollow-core waveguide. For Rayleigh particles, the axial force is found to scale with a6, while the radial force, which prevents particles from crashing into the waveguide walls, scales with a3. For microparticles, narrow Mie resonances create a strong wavelength dependence of the optical force, enabling more selective sorting. Several beam parameters, such as power, wavelength, polarization state and waveguide modes can be tuned to optimize the sorting performance. The analysis focuses on cylindrical waveguides, where meter-long liquid waveguides in the form of hollow-core photonic crystal fibers are readily available. The modes of such fibers are well-approximated by the cylindrical waveguide modes considered in the theory.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pessôa2021,

title = {A Física de um Desinfector com Radiação UV–C},

author = {M. A. S. Pessôa and F. M. e Silva and M. P. Lima Jr. and G. Galhardo and P. H. M. Olyntho and Antonio A. R. Neves},

url = {https://www.scielo.br/j/rbef/a/gcZ9sF5PQvm93WZys7467Rc/abstract/?format=html&lang=en},

doi = {10.1590/1806-9126-rbef-2021-0217},

issn = {1806-9126},

year  = {2021},

date = {2021-00-00},

urldate = {2021-00-00},

journal = {Rev. Bras. Ensino Fís.},

volume = {43},

publisher = {FapUNIFESP (SciELO)},

abstract = {In this article, we discuss the physics involved in a ultraviolet–C (UV–C) radiation chamber used for disinfection of surfaces and objects, in the context of the COVID–19 pandemic. When exposed to UV–C radiation, viral RNA change its molecular structure, a process caused by a rearrangement in the nitrogenous basis, inactivating the virus, and preventing reproduction. We propose the construction of a UV–C chamber using materials that are accessible to the population, with security features. We also discuss the design process in determining the distance and exposition time needed for the appropriate UV–C dose. Theoretical correction factors are also used, in order to account for factors that make our approximations more realistic in terms of the geometry of the system. Experimentally, the lamp used for the prototype was tested, obtaining a power in UV–C range of Puv = 171μ W, after corrections. Exposition times were then defined, ranging from 20–90 minutes, considering distances from 5–36 cm from the objects to the lamp.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}