Optical manipulation of small particles on the surface of a material

Paul, N. K.; Kemp, Brandon A.

doi:10.1088/2040-8978/18/8/085402

Cited by 5 publications

(4 citation statements)

References 49 publications

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“…В ЕВАНЕСЦЕНТНОМУ ПОЛІ Для створення теоретичних моделей розрахунку оптичних сил, що діють на частинки в еванесцентному полі [40][41][42][43][44][45][46], дослідження яких починається з 1995 року, обирали діелектричні сфери [23,24], частинки Мі [25], магнітно-діелектричні частинки [26]. Для металічних частинок теоретичний аналіз наводиться в [27][28][29]; також існує певний набір робіт, де наводяться результати досліджень впливу оптичних сил на металічні частинки в плазмонних оптичних пінцетах та маніпуляторах [30][31][32][33].…”

Section: дія оптичних сил та обертальних моментів на об'єктиunclassified

“…В [46] наводиться теоретичний аналіз дії такої поперечної компоненти оптичної сили, пов'язаної зі спіновим імпульсом, на хіральні частинки в залежності від розміру та форми останніх. Поперечні оптичні сили, що діють на металічні частинки, які локалізовані на поверхнях, досліджуються також в [43,47,48].…”

Section: дія оптичних сил та обертальних моментів на об'єктиunclassified

“…Слід зазначити, що деякі роботи присвячені оптичному захопленню [28][29][30]33] та маніпулюванню частинками еванесцентними хвилями [31,43], інші розглядають безпосередній рух частинок в еванесцентному полі [22,32,34,35,41].…”

Section: дія оптичних сил та обертальних моментів на об'єктиunclassified

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Influence of components of optical momentum and spin of evanescent waves on micro- and nanoobjects (Review)

2020

Biophysical Bulletin

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Background: Mechanical properties of light are widely used in applied areas, such as optical trapping and manipulation, sorting, deformation of biological cells and molecules. In general, the evanescent field may exhibit three components of optical momentum and spin angular momentum (spin), which manifest themselves in the occurrence of corresponding components of optical force and torque. Such extraordinary properties of evanescent waves open up new possibilities for manipulating of micro- and nanoobjects, in comparing with classical optical tweezers and manipulators, which can be used for solving the applied problems, in particular, of biomedicine. Objectives: Aim of this work is to analyze and summarize recent studies regarding to the mechanical influence of evanescent field on micro- and nanoobjects, in particular, related to the influence of transverse components of optical momentum and spin. Materials and methods: Method of momenta allows one to distinguish in an evanescent field the action of optical forces and torques, associated with the components of optical momentum and angular momentum of different nature and action direction, depending on the polarization of the incident wave. Experimental methods of particle manipulation in the near field allow visualizing such an influence, which makes it possible for solving the applied problems. Results: Recent studies demonstrate the action on nano- and microobjects of such "extraordinary" optical momentum and spin components, as transverse spin momentum, transverse spin, transverse imaginary optical momentum component, and vertical spin. Using, in particular, the latter, to solve the applied problems of biomedicine is proposed, such as transporting of therapeutic agents to pathological areas or restoring vascular patency and tissue blood supply. Conclusions: Obtained results of theoretical and experimental investigation of the mechanical action of the optical momentum and spin components of evanescent field allow us to extend the approaches of optical manipulation of micro- and nanoobjects, with the possibility of applications, in particular, for the problems of biomedicine.

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Section: дія оптичних сил та обертальних моментів на об'єктиunclassified

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Influence of components of optical momentum and spin of evanescent waves on micro- and nanoobjects (Review)

2020

Biophysical Bulletin

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“…Since Ashkin's seminal work on trapping a particle through the use of radiation forces exerted by a Gaussian laser beam [1], optical trapping techniques have been extensively used in physics, biophysics, micro-chemistry and micro-mechanics to allow trapping and manipulation of neutral atoms, nanoparticles, cells, biological substances, DNA and RNA molecules, as well as microsized dielectric particles [2][3][4][5][6][7][8][9][10][11]. However, as these techniques are based on the optical gradient force, which is dependent on the size of the particle [12], smaller particles are much more difficult to trap [13,14].…”

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Trap split with Laguerre-Gaussian beams

Kazemi

Ghanbari

Mahmoudi

2017

J. Opt.

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The optical trapping techniques have been extensively used in physics, biophysics, micro-chemistry, and micromechanics to allow trapping and manipulation of materials ranging from particles, cells, biological substances, and polymers to DNA and RNA molecules. In this Letter, we present a convenient and effective way to generate a novel phenomenon of trapping, named trap split, in a conventional four-level double- atomic system driven by four femtosecond Laguerre-Gaussian laser pulses. We find that trap split can be always achieved when atoms are trapped by such laser pulses, as compared to Gaussian ones. This work would greatly facilitate the trapping and manipulating the particles and generation of trap split. It may also suggest the possibility of extension into new research fields, such as micro-machining and biophysics. Since Ashkin's seminal work on trapping a particle through the use of radiation forces exerted by a Gaussian laser beam [1], the technique of optical trapping has been developed rapidly, becoming an integral tool in variety of different fields to manipulate neutral atoms, nanoparticles, cells, DNA and RNA molecules as well as microsized dielectric particles [2][3][4][5][6][7][8][9][10]. However, as these techniques are based on the optical gradient force which is dependent on the size of the particle [11], smaller particles are much more difficult to trap [12,13], Enhancement of the gradient force by using the femtosecond (fs) pulses could provide an efficient method to address the issue. During recent years, due to the tremendous technological advancement in the generation of fs lasers, there has been a resurgence of interest in this field [14,15] and the optical trapping technologies have been further developed [16][17][18][19][20]. Tamai et al. reported the feasibility of achieving stable laser trapping of water-soluble CdTe quantum dots by using a high repetition-rate picosecond Nd:YLF laser with two orders of magnitude lower than that used in continuous wave laser trapping [17]. Not only does fs laser lead to efficient trapping [16,17], but also it results in discoveries of novel physical phenomena including the deposition of nanostructured CdS films [18] and controlling the direction of the scattered nanoparticles [20].Recently, Okamoto's group observed the stable trapping of 60-nm gold nanoparticles when they are trapped by the fs laser pulses. They have discovered a new trapping phenomenon due to the nonlinear optical effect in which the stable trap site splits into two positions, as the incident peak-laser power approaches a threshold level, named trap split [9]. More recently, Chakraborty and Sarma have shown how to control optical trap potential (OTP) in an N-type four level atomic system by tuning the beam waist of the chirped fs Gaussian pulses and the detuning frequency [21]. They have shown that the potential splits with increasing the Rabi frequency, a behaviour analogous to that in trapping of nonparticles with fs pulses observed in Okamoto's study. In a recent paper by two ...

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Radiation forces on a Mie particle in the evanescent field of a resonance waveguide structure

rezae¹,

Azami²,

Kheirandish³

et al. 2022

J. Opt. Soc. Am. A

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Evanescent waves of a guided mode carry both momentum and energy, which enables them to move small objects located on a waveguide surface. This optical force can be used for optical near-field manipulation, arrangement, and acceleration of particles. In this paper, using arbitrary beam theory, the optical force on a dielectric particle in the evanescent wave of a resonance waveguiding structure is investigated. Using Maxwell’s equations and applying the boundary conditions, all the field components and a generalized dispersion relation are obtained. An expression for the evanescent field is derived in terms of the spherical wave functions. Cartesian components of the radiation force are analytically formulated and numerically evaluated by ignoring the multiple scattering that occurs between the sphere and plane surface of the structure. Our numerical data show that both the horizontal and vertical force components and the forward particle velocity are enhanced significantly in the proposed resonance structure compared to those reported for three-layer conventional waveguides. Exerting stronger force on macro- and nanoparticles can be very useful to perform advanced experiments in solutions with high viscosity and experiments on biological cells. In addition, this resonance planar structure can be mounted on an inverted optical microscope stage for imaging the motion of nanoparticles especially when the particle collides and interacts with objects.

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Optical manipulation of small particles on the surface of a material

Cited by 5 publications

References 49 publications

Influence of components of optical momentum and spin of evanescent waves on micro- and nanoobjects (Review)

Influence of components of optical momentum and spin of evanescent waves on micro- and nanoobjects (Review)

Trap split with Laguerre-Gaussian beams

Radiation forces on a Mie particle in the evanescent field of a resonance waveguide structure

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