Chenhao Wan
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View article: Topological structure synthesized by three-dimensional spin angular momentum of light
Topological structure synthesized by three-dimensional spin angular momentum of light Open
Hopf links are important topological structures found in a range of disciplines. They represent the projection of higher-dimensional objects to three-dimensional (3D) physical space. Optical Hopf fibration texture has been demonstrated by …
View article: Generation of optical toroidal vortex with circular asymmetric gratings
Generation of optical toroidal vortex with circular asymmetric gratings Open
Toroidal vortex, a topological structure commonly observed in nature, exist in various types such as bubbles produced by dolphins and the air flow surrounding a flying dandelion. A toroidal vortex corresponds to a spatiotemporal wave packe…
View article: Roadmap on spatiotemporal light fields
Roadmap on spatiotemporal light fields Open
Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents a major goal of the everlasting pursue of ultra-fast information transmission and processing as well as ultra-intense energy concentration and ex…
View article: Optical spatiotemporal vortices
Optical spatiotemporal vortices Open
Spatiotemporal vortices of light, featuring transverse orbital angular momentum (OAM) and energy circulation in the spatiotemporal domain, have received increasing attention recently. The experimental realization of the controllable genera…
View article: Editorial of special issue on spatiotemporal optical fields and time-varying optical materials
Editorial of special issue on spatiotemporal optical fields and time-varying optical materials Open
We give an introduction to the special issue on spatiotemporal optical fields and time-varying optical materials, composed of six articles.
View article: Scalar optical hopfions
Scalar optical hopfions Open
Hopfions are three-dimensional (3D) topological states discovered in field theory, magnetics, and hydrodynamics that resemble particle-like objects in physical space. Hopfions inherit the topological features of the Hopf fibration, a homot…
View article: Roadmap on spatiotemporal light fields
Roadmap on spatiotemporal light fields Open
Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents the holy grail of the human everlasting pursue of ultrafast information transmission and processing as well as ultra-intense energy concentration…
View article: Toroidal vortices of light
Toroidal vortices of light Open
Toroidal vortices, also known as vortex rings, are whirling, closed-loop disturbances that form a characteristic ring shape in liquids and gases and propagate in a direction that is perpendicular to the plane of the ring. They are well-stu…
View article: High-resolution optical orbital angular momentum sorter based on Archimedean spiral mapping
High-resolution optical orbital angular momentum sorter based on Archimedean spiral mapping Open
We propose a generalized spiral transformation scheme that is versatile to incorporate various types of spirals such as the Archimedean spiral and the Fermat spiral. Taking advantage of the equidistant feature, we choose the Archimedean sp…
View article: Transversely oriented cylindrically polarized optical fields
Transversely oriented cylindrically polarized optical fields Open
Cylindrical vector (CV) beams have nonuniform polarization vector distribution with a singularity line directed along the optical axis. In this paper, we propose a method to synthesize transversely oriented cylindrically polarized optical …
View article: Towards optical toroidal wavepacket through tightly focusing of cylindrical vector two dimensional spatiotemporal optical vortex
Towards optical toroidal wavepacket through tightly focusing of cylindrical vector two dimensional spatiotemporal optical vortex Open
Spatiotemporal optical vortices (STOVs) carrying transverse orbital angular momentum (OAM) are of rapidly growing interest for the field of optics due to the new degree of freedom that can be exploited. In this paper, we propose cylindrica…
View article: Generalized spiral transformation for high-resolution sorting of vortex modes
Generalized spiral transformation for high-resolution sorting of vortex modes Open
We propose a generalized spiral transformation scheme that is versatile to incorporate various types of spirals such as the Archimedean spiral and the Fermat spiral. Taking advantage of the equidistant feature, we choose the Archimedean sp…
View article: Engineering photonic angular momentum with structured light: a review
Engineering photonic angular momentum with structured light: a review Open
Structured light with inhomogeneous phase, amplitude, and polarization spatial distributions that represent an infinite-dimensional space of eigenstates for light as the ideal carrier can provide a structured combination of photonic spin a…
View article: Experimental demonstration of cylindrical vector spatiotemporal optical vortex
Experimental demonstration of cylindrical vector spatiotemporal optical vortex Open
We experimentally generate cylindrically polarized wavepackets with transverse orbital angular momentum, demonstrating the coexistence of spatiotemporal optical vortex with spatial polarization singularity. The results in this paper extend…
View article: Photonic toroidal vortex
Photonic toroidal vortex Open
Toroidal vortices are whirling disturbances rotating about a ring-shaped core while advancing in the direction normal to the ring orifice. Toroidal vortices are commonly found in nature and being studied in a wide range of disciplines. Her…
View article: Photonic orbital angular momentum with controllable orientation
Photonic orbital angular momentum with controllable orientation Open
Vortices are whirling disturbances, commonly found in nature, ranging from tremendously small scales in Bose-Einstein condensations to cosmologically colossal scales in spiral galaxies. An optical vortex, generally associated with a spiral…
View article: Non-spreading Bessel spatiotemporal optical vortices
Non-spreading Bessel spatiotemporal optical vortices Open
Non-spreading nature of Bessel spatiotemporal wavepackets is theoretically and experimentally investigated and orders of magnitude improvement in the spatiotemporal spreading has been demonstrated. The spatiotemporal confinement provided b…
View article: Generation of transversely oriented optical polarization Möbius strips
Generation of transversely oriented optical polarization Möbius strips Open
We report a time-reversal method based on the Richards-Wolf vectorial diffraction theory to generate a prescribed polarization topology on a defined trajectory within areas of relatively high intensity. An example is given to generate tran…
View article: Automated Close-Loop System for Three-Dimensional Characterization of Spatiotemporal Optical Vortex
Automated Close-Loop System for Three-Dimensional Characterization of Spatiotemporal Optical Vortex Open
Recent rapid advances in spatiotemporal optical pulses demand accurate characterization of the spatiotemporal structure of the produced light fields. We report an automated close-loop characterization system that is capable of reconstructi…
View article: Generation of transversely oriented optical polarization Möbius strips
Generation of transversely oriented optical polarization Möbius strips Open
We report a time-reversal method based on the Richards-Wolf vectorial diffraction theory to generate transversely oriented optical Möbius strips that wander around an axis perpendicular to the beam propagation direction. A number of sets o…
View article: Spin-orbit coupling within tightly focused circularly polarized spatiotemporal vortex wavepacket
Spin-orbit coupling within tightly focused circularly polarized spatiotemporal vortex wavepacket Open
Spin-orbital coupling and interaction as intrinsic light fields characteristics have been extensively studied. Previous studies involve the spin angular momentum (SAM) carried by circular polarization and orbital angular momentum (OAM) ass…
View article: Experimental demonstration of cylindrical vector spatiotemporal optical vortex
Experimental demonstration of cylindrical vector spatiotemporal optical vortex Open
We experimentally generate cylindrically polarized wavepackets with transverse orbital angular momentum, demonstrating the coexistence of spatiotemporal optical vortex with spatial polarization singularity. The results in this paper extend…
View article: Subwavelength focusing of a spatio-temporal wave packet with transverse orbital angular momentum
Subwavelength focusing of a spatio-temporal wave packet with transverse orbital angular momentum Open
We report the method of producing a spatio-temporal (ST) wave packet carrying pure transverse orbital angular momentum (OAM) with subwavelength spatial sizes. Due to the lack of temporal focusing, an ST wave packet focused by a high numeri…
View article: Generation of exotic optical polarization Möbius strips
Generation of exotic optical polarization Möbius strips Open
We report a method of generating exotic optical polarization Möbius strips through tightly focusing an arbitrary vector beam. A heart-shaped Möbius strip, an "8"-shaped twin Möbius strip, and a circular Möbius strip with varying polarizati…
View article: Diffraction-limited near-spherical focal spot with controllable arbitrary polarization using single objective lens
Diffraction-limited near-spherical focal spot with controllable arbitrary polarization using single objective lens Open
We report a time-reversal method based on the Richards-Wolf vectorial diffraction theory to generate a diffraction-limited near-spherical focal spot with arbitrary three-dimensional state of polarization using single objective lens. Three …
View article: High efficiency geometric-phase polarization fan-out grating on silicon
High efficiency geometric-phase polarization fan-out grating on silicon Open
We report the design, fabrication and characterization of a 1-by-5 geometric-phase polarization fan-out grating for coherent beam combining at 1550 nm. The phase profile of the grating is accurately controlled by the local orientation of t…
View article: Tightly focused optical field with controllable photonic spin orientation
Tightly focused optical field with controllable photonic spin orientation Open
The spin angular momentum of photons offers a robust, scalable and high-bandwidth toolbox for many promising applications based upon spin-controlled manipulations of light. In this work, we develop a method to achieve controllable photonic…