A new level of anisotropic plasmonic laser printing for aluminum multifunctional metasurfaces.

Thanks to their unique optical and electric properties, 2D materials have attracted a lot of interest for optoelectronic applications. Here, the emerging materials, organic-inorganic hybrid perovskites with van der Waals interlayer interaction (Ruddlesden-Popper perovskites), are synthesized characterized. Photodetectors based on few-layer Ruddlesden-Popper perovskite show good photoresponsivity as well detectivity. In order further improve photoresponse performance, MoS2 is chosen construct...

The principle of optical trapping is conventionally based on the interaction fields with linear-induced polarizations. However, force originating from nonlinear polarization becomes significant when nanoparticles are trapped by femtosecond laser pulses. Herein we develop time-averaged forces a nanoparticle using high-repetition-rate pulses, linear and effects. We investigate dependence magnitudes signs refractive nonlinearities. It found that self-focusing effect enhances ability, whereas...

Spin angular momentum (SAM) is widely used in spin-dependent unidirectional optical interfaces, manipulation, integrated signal processing, laser structuring and other fields, but its physical mechanism has not been fully understood so far. In this work, we investigate the three-dimensional (3D) SAM tightly focused x-polarized first-order vortex beams from perspectives of light field itself, phase distribution, focusing propagation. It shown that distribution three orthogonal components at...

Optical image encryption, especially double-random-phase-based, is of great interest in information security. In this work, we experimentally demonstrate the security and feasibility optical encryption with asymmetric double random phase computer-generated hologram (CGH) by using spatial light modulator. First all, encrypted modulated numerically encoded into real-value CGH. Then, CGH loaded on modulator optically decrypted self-designed experimental system. Experimental decryption results...

Polarization imaging techniques have more prominent advantages for in strongly scattered media. Previous de-scattering methods of polarization usually require the priori information background region, and rarely consider effect non-uniformity optical field on image recovery, which not only reduces processing speed but also introduces errors especially moving targets complex scattering environments. In this paper, we propose a turbid underwater recovery method based global estimation...

The generation, propagation, and applications of different types integer vector beams have been extensively investigated. However, little attention focuses on the photophysical photomechanical properties fractional beam (FVB). Herein, we theoretically experimentally investigate spin angular momentum (SAM) separation propagation characteristics weakly focused FVBs. It is demonstrated that such a carrying no SAM leads to both transverse special intensity patterns in focal region. Furthermore,...

Compared with the on-axis vortex beam and off-axis single beam, double has more control degrees of freedom brings rich physical properties. In this work, we investigate theoretically experimentally generation, topological charge (TC), orbital angular momentum (OAM) beams. It is demonstrated that tilted lens method can detect not only magnitudes signs two TCs but also spatial distribution TCs. Moreover, average OAM value decreases nonlinearly as distance increases, although its TC independent...

We generate a new kind of azimuthal-variant vector field with distribution states polarization (SoPs) described by the square azimuthal angle. Owing to asymmetrical SoPs this localized linearly polarized field, tightly focused exhibits double half-moon shaped pattern elliptical in cross section at focal plane. Moreover, we study three-dimensional distributions spin and orbital linear angular momenta region. numerically investigate gradient force, radiation torque, torque on dielectric...

Based on the inverse Faraday effect, light-induced magnetization field distributions are investigated for a 4π tight focusing configuration with azimuthally polarized beams. It is found that superlong (16λ) chain, composed of 19 subwavelength (0.44λ) spherical spots longitudinal field, can be achieved in focal volume objective. Moreover, magnetic force particle or trains produced by tightly focused beams calculated and exploited stable trapping particles. These unique may find potential...

In this paper, the general formula for tightly focusing radially polarized beams (RPB) superposed with off-axis vortex arrays is derived based on Richard-Wolf vector diffraction theory. The breaks rotational symmetry of energy flow along axial direction and leads to spatial redistribution intensity within focal plane. dependence consequent distance vortices as well numerical aperture lens theoretically studied. Based intriguing feature, generation equilateral-polygon-like flat-top focus...

We present a method to measure the high-order optical orbital angular momentum (OAM) with variable cylindrical lens pair. The system consists of two lenses opposite focal length. It produces rotating position—spatial frequency transformation phase modulation by changing angle between lenses. With this feature, can flexibly OAM states vortex beams different beam waists. are determined number and direction dark stripes diffraction pattern. measurements topological charge radial index...

Abstract To improve the security and invisibility of image encryption concealment, an encrypted computer generated hologram (CGH) watermarking technology based on discrete wavelet transform (DWT) singular value decomposition (SVD) is proposed. Firstly, to be encoded converted into a binary real-valued CGH. The CGH then embedded host as watermark, implementing concealment. During decryption, watermark first extracted using inverse DWT-SVD correct keys. Subsequently, decrypted obtained by...

The propagation characteristics of an off-axis high-order cylindrical vector beam (OHCVB) are studied in this paper. analytic expressions for the electric field and intensity distribution OHCVB propagating free space presented, to our knowledge first time. transverse OHCVB, different from that input Gaussian beam, does not have axially symmetric distribution, owing a slight dislocation between polarization singularity located generator center point beam. Numerical results show during...

We propose a simple and flexible method to create identical multiple focal spots with three-dimensional arbitrary shifting without moving lenses or laser beams. The incident cylindrical vector (CV) beam superposed predesigned phase amplitude modulations is tightly focused by single lens. predetermined number positions are generated the intensity distribution as well polarization for each individual spot demonstrated. also present dynamic four along Pyramid-like trajectory continuously...

Based on the Richards–Wolf vectorial diffraction theory and inverse Faraday effect, we first propose a scheme to generate three-dimensional magnetization needle (MN) arrays with arbitrary orientation for each individual controllable spatial position number by reversing electric dipole array radiation. To achieve this, unit of has two dipoles orthogonal oscillation directions quadrature phase is located mirror-symmetric respect focal plane high numerical aperture lens. Uniformly distributed...

In this Letter, all-optical generation of magnetization with arbitrary three-dimensional (3D) orientations is numerically demonstrated through the inverse Faraday effect (IFE) by using a reversing calculation method. The IFE-induced an expected 3D orientation initially conceived coherently configuring two orthogonally arranged electric dipoles phase difference π/2 in focal region to-be-determined incident light field. Based on dipole antenna theory, required field can be deduced analytically...

Abstract Optical pulling forces exerted on small particles can be achieved by tailoring the properties of electromagnetic field, themselves, or surrounding environment. However, nonlinear optical effect environment has been largely neglected. Herein, we report a Rayleigh particle immersed in liquid using high-repetition-rate femtosecond laser pulses. The analytic expression time-averaged allows us to better understand underlying mechanism transportation. It is shown that two-photon...

Abstract A hybrid digital watermarking and encryption technique based on the Computer Generated Holography (CGH) fractional Fourier transform (FRFT) combined with singular value decomposition (SVD) algorithm is proposed for securing three-dimensional (3D) information. Initially, hierarchical 3D information encrypted using angular spectrum diffraction method a random phase key. This process yields binary real valued CGH, where incorporating key broadens space adds complexity, effectively...

As a class of integer-order vector beams, hybridly polarized beams (HPVBs) are widely used in focus shaping, femtosecond laser filamentation, linear and nonlinear polarization evolution, etc. Recently, fractional-order have gained widespread interest due to their more control parameters, rich photophysical properties, novel optical phenomena. In this work, we report the experimental generation, focusing propagation characteristics, spatial self-phase modulation (SSPM) phenomenon HPVBs. It is...

Incorporating different data processing methods, optical coherence tomography (OCT) has the ability for high-resolution angiography and quantitative flow velocity measurements. However, OCT cannot provide information of velocities, measurement based on Doppler requires determination angles, which is a challenge in complex vascular network. In this study, we report relative standard deviation (RSD-OCT) method provides both network mapping velocities within wide range angles. The RSD values...

In this paper, various hollow structured optical fields are generated by skillfully adjusting the number and positions of multiple off-axis vortices loaded in a Gaussian beam. The focal-field characteristics after passing through an ordinary lens studied based on scalar diffraction theory. Firstly, variety theoretically simulated analyzed. On basis, experiments implemented built system for multi-off-axis vortex beam focusing lens. experiments, detected CCD which consistent with theoretical...