Andy Chong
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View article: Nanoscale MoS2-in-Nanoporous Au Hybrid Structure for Enhancing Electrochemical Sensing
Nanoscale MoS2-in-Nanoporous Au Hybrid Structure for Enhancing Electrochemical Sensing Open
We report the fabrication of nanoscale MoS2 (nMoS2) via laser ablation in liquid and its application in electrochemical sensing. The laser ablation process fragments microscale MoS2 sheets into ~5 nm dots with stable aqueous dispersibility…
View article: Mode-Locked Fiber Lasers with Prism-Based Spectral Filters
Mode-Locked Fiber Lasers with Prism-Based Spectral Filters Open
A spectral filter utilizing dispersive prisms and an optical fiber collimator is presented as an attractive alternative to diffraction grating-based spectral filters. A simplified analytical expression for this prism-based spectral filter …
View article: Spatiotemporal photonic emulator of potential-free Schrödinger equation
Spatiotemporal photonic emulator of potential-free Schrödinger equation Open
Photonic quantum emulator utilizes photons to emulate the quantum physical behavior of a complex quantum system. Recent study in spatiotemporal optics has enriched the toolbox for designing and manipulating complex spatiotemporal optical w…
View article: Observation of spatiotemporal coupled Airy-Airy wavepacket and its propagation dynamics
Observation of spatiotemporal coupled Airy-Airy wavepacket and its propagation dynamics Open
Airy beams, celebrated for their self-acceleration, diffraction-free propagation, and self-healing properties, have garnered significant interest in optics and photonics, with applications spanning ultrafast optics, laser processing, nonli…
View article: Spatiotemporal coupled Airy-Airy wavepacket and its propagation dynamics
Spatiotemporal coupled Airy-Airy wavepacket and its propagation dynamics Open
Airy beams, celebrated for their self-acceleration, diffraction-free propagation, and self-healing properties, have garnered significant interest in optics and photonics, with applications spanning ultrafast optics, laser processing, nonli…
View article: Full space-time abrupt autofocusing spherical Airy wavepacket
Full space-time abrupt autofocusing spherical Airy wavepacket Open
The ability to precisely focus optical beams is crucial for numerous applications, yet conventional Gaussian beams exhibit slow intensity transitions near the focal point, limiting their effectiveness in scenarios requiring sharp focusing.…
View article: Three-dimensional abruptly autofocusing by counter-propagating Airy pulses with radial Airy beam profile
Three-dimensional abruptly autofocusing by counter-propagating Airy pulses with radial Airy beam profile Open
We report the experimental observation of a three-dimensional abruptly autofocusing effect by synthesizing a radially distributed Airy beam with two counter-propagating Airy pulses in time. As the wave packet propagates in a dispersive med…
View article: Spatiotemporal Photonic Emulator of Potential-free Schrödinger Equation
Spatiotemporal Photonic Emulator of Potential-free Schrödinger Equation Open
Photonic quantum emulator utilizes photons to emulate the quantum physical behavior of a complex quantum system. Recent study in spatiotemporal optics has enriched the toolbox for designing and manipulating complex spatiotemporal optical w…
View article: Full space-time Talbot effect
Full space-time Talbot effect Open
The Talbot effect, a well-established phenomenon in optics, has been a subject of extensive research for many years. Recently, there has been growing interest in its periodic revival within periodically structured light fields during free …
View article: Spatiotemporal optical vortex reconnections of loop vortices
Spatiotemporal optical vortex reconnections of loop vortices Open
Reconnections of spatiotemporal optical vortices have been shown to occur between line vortices. Here, we show that reconnections also occur between spatiotemporal loop vortices in optical waves. As optical loop vortices propagate in a med…
View article: Grating Pair Wavepacket Shaper for Crafting Spatiotemporal Optical Vortices with Arbitrary Tilt Angles
Grating Pair Wavepacket Shaper for Crafting Spatiotemporal Optical Vortices with Arbitrary Tilt Angles Open
Spatiotemporal optical vortices with arbitrary tilt angles can be generated by adjusting spatial chirp and beam size at a phase modulation plane in a pulse shaper setup. A grating pair setup is proposed to generate variable spatial chirp i…
View article: Perfect Spatiotemporal Optical Vortices
Perfect Spatiotemporal Optical Vortices Open
Recently, spatiotemporal optical vortices (STOVs) with transverse orbital angular momentum have emerged as a significant research topic. While various STOV fields have been explored, they often suffer from a critical limitation: the spatia…
View article: Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers
Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers Open
Optical spatiotemporal vortices with transverse photon orbital angular momentum (OAM) have recently become a focal point of research. In this work we theoretically and experimentally investigate optical spatiotemporal vortices with radial …
View article: Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers
Spatiotemporal optical vortices with controllable radial and azimuthal quantum numbers Open
Optical spatiotemporal vortices with transverse photon orbital angular momentum (OAM) have recently become a focal point of research. In this work we theoretically and experimentally investigate optical spatiotemporal vortices with radial …
View article: Spatiotemporal Hologram
Spatiotemporal Hologram Open
Spatiotemporal structured light has opened up new avenues for optics and photonics. Current spatiotemporal manipulation of light mostly relies on phase-only devices such as liquid crystal spatial light modulator to generate spatiotemporal …
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: Propagation of transverse photonic orbital angular momentum through few-mode fiber
Propagation of transverse photonic orbital angular momentum through few-mode fiber Open
Spatiotemporal optical vortex (STOV) pulses can carry transverse orbital angular momentum (OAM) that is perpendicular to the direction of pulse propagation. For a STOV pulse, its spatiotemporal profile can be significantly distorted due to…
View article: Tilted spatiotemporal optical vortex with partial temporal coherence [Invited]
Tilted spatiotemporal optical vortex with partial temporal coherence [Invited] Open
We report the experimental and theoretical investigation of tilted spatiotemporal optical vortices with partial temporal coherence. The theoretical study shows that the instantaneous spatiotemporal optical vortex is widely variable with th…
View article: Temporal manipulation of spatiotemporal optical vortices with an Airy pulse [Invited]
Temporal manipulation of spatiotemporal optical vortices with an Airy pulse [Invited] Open
We demonstrate the temporal manipulation of spatiotemporal optical vortices (STOVs) by utilizing Airy pulses. By combining a STOV with an Airy temporal profile, the STOV exhibits nondispersive, self-accelerating, and self-healing features …
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: Spatiotemporal optical vortices with arbitrary orbital angular momentum orientation by astigmatic mode converters
Spatiotemporal optical vortices with arbitrary orbital angular momentum orientation by astigmatic mode converters Open
We generate a spatiotemporal optical vortex (STOV) with tunable orbital angular momentum (OAM) orientation by a simple lens system. We utilize a cylindrical lens system, which is an astigmatic mode converter, to add longitudinal angular mo…
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: Generation of spatiotemporal optical vortices with partial temporal coherence
Generation of spatiotemporal optical vortices with partial temporal coherence Open
Recently, a spatiotemporal optical vortex (STOV) with a transverse orbital angular momentum (OAM) has been generated from coherent ultrafast pulses using mode-locked lasers. In contrast, we demonstrate theoretically and experimentally that…