Optical manipulations utilizing the mechanical effect of light have been indispensable in various disciplines. Among those manipulations, optical pulling has emerged recently as an attractive notion and captivated popular imagination, not only because it constitutes a rich family counterintuitive phenomena compared with traditional but also due to profound physics underneath potential applications. Beginning general introduction forces, related theories, methods, we review progresses...

We achieve long-range and continuous optical pulling in a periodic photonic crystal background, which supports unique Bloch mode with the self-collimation effect. Most interestingly, force reported here is mainly contributed by intensity gradient originating from self-induced backaction of object to mode. This sharply distinguished widely held conception tractor beams based on scattering force. Also, this insensitive angle incidence can pull multiple objects simultaneously.

We report an ingenious mechanism to obtain robust optical pulling force by a single plane wave via engineering the topology of light momentum in background. The underlying physics is found be topological transition from usual convex shape starlike concave carefully designed background, such as photonic crystal structure. principle and results reported here shed insightful concepts concerning pulling, pave way for new class advanced manipulation technique, with potential applications drug...

We propose a wide-angle, polarization independent and fabrication-tolerant perfect absorber, which is based on one-dimensional stacked array consisted of vertically cascaded two pairs metal-dielectric bilayers. The results show that the absorption peaks are over 99% at wavelength 5.25 μm for different angles, remain very high within wide ranges incident azimuthal angles. attribute those excellent performances to excitation magnetic resonance (MR) guided mode (GMR) TM TE polarization,...

Abstract Hybrid‐order Poincaré beams (HyOPBs) with complex transverse polarization states hold significant potential in optical communication and quantum information. Fully characterizing the parameters of HyOPBs is a key task to accelerate applications. Conventional methods typically require mapping multiple reconstructing point by point, creating fundamental bottleneck for fast measurement real‐time monitoring parameters. In this work, single‐shot characterization scheme demonstrated...

We propose a robust scheme to achieve optical pulling force using the guiding modes supported in hollow core double-mode photonic crystal waveguide instead of structured beams free space investigated earlier. The under consideration supports both 0th order mode with larger forward momentum and 1st smaller momentum. When is launched, scattering by object inside results conversion from mode, thus creating according conservation linear present quantitative agreement between derived analysis...

Optical evanescent wave in total internal reflection has been widely used efficient optical manipulation, where the object is trapped by intrinsic intensity gradient of while transported scattering force along orthogonal direction. Here, we propose a distinct manipulation scheme using attenuated modes subwavelength channels, both trapping and transportation forces are channel We create such mode sub-wavelength photonic crystal waveguide quantitatively obtain net pushing pulling forces, which...

Abstract The equipartition theorem is an elegant cornerstone theory of thermal and statistical physics. However, it fails to address some contemporary problems, such as those associated with optical acoustic trapping, due the non-Hermitian nature external wave-induced force. We use stochastic calculus solve Langevin equation thereby analytically generalize a that we denote non-equipartition theory. calculate relevant statistics, which reveal averaged kinetic potential energies are no longer...

Dynamic simulation is a powerful tool to observe the behavior of arbitrary shaped particles trapped in focused laser beam. Here we develop method find equilibrium positions and orientations using dynamic simulation. This general applied micro- nano-cylinders as demonstration its predictive power. Orientation landscapes for with beams differing polarisation are presented. The torque efficiency micro-cylinders at plane also calculated function tilt angle. systematic investigation elucidates...

Abstract Color tuning is a fascinating and indispensable property in various applications. Thus far, variety of reconfigurable approaches have been implemented to achieve color change. However, it still challenge enable continuous over the entire hue range simple, stable, rapid manner without changes configuration material properties. Here, an all‐optical continuously tunable plasmonic pixel scheme demonstrated via modular design approach realize polarization‐controlled full by breaking...

Aside from optical pushing and trapping that have been implemented successfully, the transportation of objects backward to source by pulling forces (OPFs) has attracted tremendous attention, which was usually achieved increasing forward momentum light. However, limited transfer between light object greatly constrains amplitudes OPFs. Here, we present a mechanism generate strong interactions background through bound states in continuums, can large OPFs without The underlying physics is...

We design and numerically investigate an omnidirectional polarization insensitive nearly perfect absorber in the mid-infrared regime, which is just a one dimensional metallic grating with pair of metal–dielectric bilayer on ridge. Absorption peaks over 99% are simultaneously achieved around wavelength 5.73 μm for both TM TE polarizations, they also remain very high wide range incident angle polarizations. According to analysis electromagnetic field distributions, we attribute absorption...

Abstract Polarization ( P ), angular index l and radius p ) are three independent degrees of freedom (DoFs) vector vortex beams, which have found extensive applications in various domains. While efficient sorting a single DoF has been achieved successfully, simultaneous all these DoFs compact manner remains challenge. In this study, we propose beam sorter that simultaneously handles the using diffractive deep neural network (D 2 NN), demonstrate robust 120 Laguerre–Gaussian (LG) modes...

Spin angular momentum can contribute to both optical force and torque exerted on spheres. Orbit rate of spheres located in tightly focused LG beams with the same azimuthal mode index l is spin-controlled due spin-orbit coupling. Laguerre-Gaussian high-order are used here study orbit dielectric rates varying sizes refravtive indices investigated as well forces acting different modes. These results would be much helpful investigation rotation transfer spin orbital momentum.

Vortex beams, carrying orbital angular momentum (OAM), have great potential to increase the information capacity of optical communication systems for orthogonality and infinite mode number. For OAM beams propagating in free space, however, atmospheric turbulence may cause distortions hinder their utilization practice. In this work, we propose a kind diffractive deep neural network (D2NN) compensate distorted beams. Different from those D2NNs reported before, here is dissipative, rather than...

Based on a hybrid discrete dipole approximation (DDA) and T-matrix method, powerful dynamic simulation model is used to find plausible equilibrium orientation landscapes of micro- nano-spheroids varying size aspect ratio. Orientation spheroids are described in both linearly circularly polarized Gaussian beams. It's demonstrated that the orientations prolate oblate have different performances. Effect beam polarization revealed as well new spheroids. The torque efficiencies at also studied...

Vector structured beams (VSBs) offer infinite eigenstates and open up new possibilities for high-capacity optical quantum communications by the multiplexing of states. Therefore, sorting measuring VSBs are extremely important. However, efficient manipulations a large number have simultaneously remained challenging to now, especially in integrated systems. Here, we propose compact spin-multiplexed diffractive metasurface capable continuously detecting arbitrary through spatial intensity...

Mode converter (MC) is an indispensable element in the mode multiplexing and demultiplexing system. Most previously reported converters have been of transmission type, while reflective are significantly lacking. In this paper, we propose ultra-compact (RMC) structure, which comprises a slanted waveguide surface coated with metallic film subwavelength metamaterial refractive index modulation region. The results demonstrate that RMC can achieve high-performance conversion within extremely...

Optical trapping of nano-objects (i.e., the nano-tweezers) has been investigated intensively. Most those nano-tweezers, however, were focused on a single nanoparticle, while interactions between them seldom considered. In this work, we propose nano-tweezers in slot photonic crystal cavity supporting multiple modes, where relative positions two trapped nanoparticles can be tuned by selective excitation different resonant mode. Results show that both are at center when first order mode is...

Through rigorous simulations, the light scattering induced optical binding of one-dimensional (1D) dielectric photonic crystals is studied. The forces corresponding to pass band, band gap, and edge are qualitatively different. It shown that can induce self-organization slabs into stable crystals, with its lower coinciding incident frequency. Incident at normal oblique incidence parity-time symmetry also considered.

Laguerre–Gaussian (LG) mode is widely adopted in various applications due to carrying orbital angular momentum (OAM). In practice, it challenging sort according features. Traditional fork grating and optical geometric transformations are regarded as convenient methods for sorting LG mode. However, these have destroy the OAM carried by beam during process. Here, we demonstrate a nondestructive mechanism momentums based on translation operator. The numerically solved operator can input beams...

Resonance between light and object is highly desired in optical manipulation because the forces reach maximum values this case. However, traditional waveguide structures, resonant interaction also greatly perturbs incident field weakens or completely destroys on subsequent particles. In order to avoid dilemma, we propose perform a topological photonic structure. Owing protection, mode can almost keep its original form when an being manipulated. Therefore, sorting be achieved multiple high...