Abstract The spatial self‐phase modulation (SSPM) of phosphorus‐based nanomaterials is widely studied and developed as passive nonlinear photonic devices for applications in all‐optical switches, logic gates, information converters, etc. In this work, violet phosphorus quantum dots (VP QDs) are prepared characterized three different solvents, their SSPM investigated, asymmetric light propagation performances demonstrated. It shown that VP QDs solvents exhibit bandgaps, mainly due to the...

Optical trapping and manipulation have emerged as a powerful tool in the biological physical sciences. In this work, we present miniature optical tweezers device based on multifocal vortex metalens (MOVM). The MOVM is capable of generating multiple focal fields with specific orbital angular momentum at arbitrary position. force field exerted both high-refractive-index particle low-refractive-index are analyzed. simulation results show that two kinds dielectric particles can be trapped...

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...

Metasurfaces with tunable/switchable circular dichroism (CD) response have great potential to serve as important elements for plenty of advanced applications. In this work, we proposed a novel metasurface absorber integrated periodic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">G</mml:mi> mathvariant="normal">e</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub>...

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...

In this work, we propose a novel strategy to optically trap and manipulate metallic nanoparticles using evanescent vortex Bessel beam (EVBB). A versatile method is presented generate with tunable optical angular momentum by focusing radially polarized onto one-dimensional photonics band gap structure. The behavior of nanoparticle in the EVBB numerically studied. We show that such particle can be stably trapped near surface. orbital drives orbit around axis, direction motion controlled...

As an allotrope of phosphorus, layered violet phosphorus (VP) has a wide range applications in electronics, photonics, and optoelectronics. However, its nonlinear optical properties remain to be explored. In this work, we prepare characterize VP nanosheets (VP Ns), investigate their spatial self-phase modulation (SSPM) effects, develop them all-optical switching applications. The ring forming time SSPM the third-order susceptibility monolayer Ns were found about 0.4 s 10-9 esu, respectively....

Abstract Molybdenum phosphide (MoP) has excellent catalytic activity in hydrogen evolution reactions, but research on its nonlinear optical properties is just beginning. In this work, the spatial self‐phase modulation (SSPM) phenomena of semimetal MoP spherical microparticles are investigated, their applications spatially asymmetric propagation and all‐optical switching developed. The effective refractive index n 2 ring formation time τ F SSPM measured to be about 10 −5 cm W −1 0.4 s,...

We present an arbitrary vector field with hybrid polarization based on the combination of a pair orthogonal elliptically polarized base vectors Poincaré sphere. It is shown that created only dependent latitude angle 2χ but independent longitude 2ψ By adjusting 2χ, which related to two identical waveplates in common path interferometric arrangement, one could obtain type fields. Experimentally, we demonstrate generation such kind fields and confirm distribution state by measurement Stokes...

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...

Abstract In structured light tweezers, it is a challenging technical issue to realize the complete circular motion of trapped particles parallel optical axis. Herein, we propose and generate novel skipping rope via combining beam shaping technology, Fourier shift theorem, grafting technology. This can induce transverse orbital angular momentum (OAM) (i.e., nominal OAM, whose direction perpendicular axis) transfer particles, so that have torque, thereby causing rotate Experimentally, our...

Optical antennas have been utilized to tailor the emission properties of nanoscale emitters in terms intensity, directivity and polarization. In this letter, we further explore capability beam steering via use a spiral plasmonic structure as transmitting antenna. According both numerical simulation experimental observations, beaming direction can be steered through introducing displacement feeding point antenna from geometrical center. For 3-turn Archimedes' antenna, results show that angles...

We demonstrate a novel detection scheme for the orbital angular momentum (OAM) of light using circular plasmonic lens. Owing to division-of-amplitude interference phenomenon between surface plasmon waves and directly transmitted light, specific intensity distributions are formed near lens under different OAM excitations. Due phase behaviors evanescent wave direct transmission, patterns rotate as observation plane moves away from surface. The rotation direction is measure sign OAM, while...

Abstract Optical trapping and manipulation using focused laser beams has emerged as a powerful tool in the biological physical sciences. However, scaling this technique to metallic nanoparticles remains challenging due strong scattering force optical heating effect. In work, we propose novel strategy optically trap even under resonant condition engineered field. The distribution of forces can be tailored through optimizing spatial vectorial illumination favour stable variety various...

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...

Optical trapping techniques hold great interest for their advantages that enable direct handling of nanoparticles. In this work, we study the optical effects a diffraction-limited focal field possessing an arbitrary photonic spin and propose convenient method to manipulate movement behavior trapped order achieve controllable axis orientation ellipticity tightly focused beam in three dimensions, efficient analytically calculate experimentally generate complex fields at pupil plane high...

Light fields with structured polarization distribution interacting media will result in many novel optical effects both the linear and nonlinear regimes. In this work, we report a theoretical investigation of vectorial self-diffraction behaviors evolution characteristics radially polarized beam induced by anisotropic Kerr nonlinearity. By taking polarization-orientation dependence third-order refractive nonlinearity, study far-field patterns using Rayleigh-Sommerfeld formulas. Numerical...

Circular dichroism (CD) spectroscopy is an important technique in the fields of chemistry, biology, and life sciences a commonly used method to analyze chirality molecules. However, due weak natural materials, CD signals are usually very small; hence, high sample density normally required. Here, we theoretically proposed generation superchiral light–matter interaction on high-refractive-index dielectric metasurface, which consists silicon nanocylinder dimer structures. Upon illumination...

In this Letter, we study the emission properties of an electric dipole emitter coupled to a plasmonic spiral structure. The structure functions as optical antenna, coupling into circularly polarized unidirectional in far field. Increasing number turns leads narrower angular width pattern For antenna with six turns, directivity 23.5 dB directional narrow cone 4.3° can be achieved. emitted photons carry spin that is essentially determined by handedness antenna. By reversing spiral, one switch...

Both spin angular momentum (SAM) and orbital (OAM) can be used to carry information in classical optics quantum optics. In this paper, the encoding of (AM) photons onto surface plasmon polaritons (SPPs) is demonstrated using a nano-ring plasmonic lens. Near-field energy distribution on metal measured near-field scanning optical microscope (NSOM) when lens excited by with different combinations SAM OAM. It found that both OAM influence near field SPPs. More interestingly, numerical...

Optical complex fields have attracted increasing interests because of the novel effects and phenomena arising from spatially inhomogeneous state polarizations optical singularities light beam. In this work, we propose a spiral blade plasmonic vortex lens (SBPVL) that offers unique opportunities to manipulate these fields. The strong interaction between SBPVL enable synthesis highly tunable vortex. Through theoretical derivations numerical simulations demonstrated characteristics are...

Orbital angular momentum (OAM) state of photons offer an attractive additional degree freedom that has found a variety applications. Measurement OAM state, which is critical task these applications, demands photonic integrated devices for improved fidelity, miniaturization, and reconfiguration. Here we report the design silicon-integrated receiver capable detecting distinct variable states. Furthermore, reconfiguration capability detector achieved by applying voltage to GeSe film form...

Since the fundamental building blocks of life are built chiral amino acids and sugar, enantiomer separation is great interest in plenty chemical syntheses. Light-chiral material interaction leads to a unique optical force, which possesses opposite directions for specimens with different handedness. However, usually enantioselective sorting challenging tweezers due dominating achiral force. In this work, we propose an technique sort by use transverse needle field spin (TONFTS), constructed...