Photonic gauge potentials, including scalar and vector ones, play fundamental roles in emulating photonic topological effects for enabling intriguing light transport dynamics. While previous studies mainly focus on manipulating propagation uniformly distributed here we create a series of gauge-potential interfaces with different orientations nonuniform discrete-time quantum walk demonstrate various reconfigurable temporal-refraction effects. We show that lattice-site interface the potential...

Experimental demonstration of tunable temporal Goos-Hänchen shift (GHS) in synthetic discrete-time heterolattices with scalar and vector gauge potentials is reported. By using Heaviside-function modulation two fiber loops, we create a sharp gauge-potential interface observe GHS for total internal reflection (TIR), which manifests as time delay rather than spatial shift. The TIR occurs the incident mode falls into band gap transmitted region shifting by potential. We find that both potential...

Dynamic localization (DL) of photons, i.e., the light-motion cancellation effect arising from lattice's quasi-energy band collapse under a synthetic ac-electric-field, provides powerful and alternative mechanism to Anderson for coherent light confinement. So far only low-order DLs, corresponding weak ac-fields, have been demonstrated using curved-waveguide lattices where waveguide's bending curvature plays role ac-field as required in original Dunlap-Kenkre model DL. However, inevitable...

Landau-Zener tunneling (LZT), i.e., the nonadiabatic transition under strong parameter driving in multilevel systems, is ubiquitous physics, providing a powerful tool for coherent wave control both quantum and classical systems. While previous works mainly focus on LZT between two energy bands time-invariant crystals, here, we construct synthetic time-periodic temporal lattices from coupled fiber loops demonstrate dc- ac-driven LZTs periodic Floquet bands. We show that display distinctive...

A waveguide coupler under both phase and intensity modulation is proposed to generate a non-Hermitian Su-Schrieffer-Heeger lattice in frequency dimension. By varying the period phase, we can manipulate on-site potential of realize anisotropic coupling supermodes waveguides. The artificial electric field associated with also be introduced simultaneously. Zener tunneling demonstrated system manifests an irreversibly unidirectional conversion between odd even supermodes. efficiency optimized by...

Abstract Refraction is a basic beam bending effect at two media’s interface. While traditional studies focus on stationary boundaries, moving boundaries or potentials could enable new laws of refractions. Meanwhile, discretization plays pivotal role in refraction owing to Galilean invariance breaking principle discrete-wave mechanics, making highly moving-speed dependent. Here, by harnessing synthetic temporal lattice fiber-loop circuit, we observe discrete time gauge-potential barrier. We...

Super-Bloch oscillations (SBOs) are amplified versions of direct current (dc)-driving Bloch realized under the detuned dc- and alternating (ac)-driving electric fields. A unique feature SBOs is coherent oscillation inhibition via ac-driving renormalization effect, which dubbed as collapse SBOs. However, previous experimental studies on have only been limited to weak regime, has not observed. Here, by harnessing a synthetic temporal lattice in fiber-loop systems, we push ac-field into...

Here we use a four-wave mixing time lens to demonstrate the spectral self-imaging effect for frequency comb. The is built by imposing temporal quadratic phase modulation onto input signal pulses, which corresponds comb in Fourier spectrum. implemented Gaussian pump pulse propagating an external single-mode fiber. Both and pulses are injected into highly nonlinear fiber Bragg scattering occurs. We observe periodic revivals of as propagates distances. comb-spacing squeezed at fractional ratios...

Abstract Dynamic localization (DL) refers to a wavefunction confinement effect of electrons in periodic lattices under an ac electric field driving. Recent studies have transplanted DLs from electronic photonic systems using periodically curved waveguide lattices, where the is mimicked by waveguide's bending curvature. However, due severe limitations losses and poor tunability for highly curved, arbitrarily shaped waveguides, present mainly focus on DL simplest sinusoidal‐wave driving; its...

We investigate the non-Hermitian Hofstadter-Harper model composed of microring resonators, in which skin effect (NHSE) is particularly analyzed. The achieved through interaction between well-designed gain-loss layouts and artificial gauge fields. Remarkably, we reveal emergence a hybrid skin-topological (HSTE), where only original topological edge modes convert to while bulk remain extended. By changing distributions fields, show NHSE can manifest itself be localized at specific edges. Using...

Bloch oscillations (BOs) in a parity-time (PT)-symmetric Su-Schrieffer-Heeger (SSH) waveguide array are theoretically investigated. We show that the BOs amplified or damped even for systems to exhibit entirely real energy bands. The and stem from complex Berry phase closely relate topological properties of lattice. For nontrivial lattice, amplification attenuation much more prominent than trivial case output mode can be selected. Furthermore, we propose an experimental scheme perform...

Here, we propose the construction of acoustic Weyl semimetals in synthetic dimensions based on a 2D coupling waveguide array under external dynamic modulations. The type-I, type-II, and line node can be realized one lattice associated transitions between different phases implemented by flexibly adjusting correspondence symmetries is analyzed. results clearly show that spectra topological surface states undergo bidirectional or unidirectional shifts frequency domain according to type points....

Non-Hermitian skin effect (NHSE), i.e., the localization of eigenstates near lattice boundaries, has recently spurred tremendous interest in topological physics. Beyond well-explored linear NHSE, interplay nonlinearity and represents a cutting-edge area research, offering novel insights into wave propagation control various physical systems. Unlike NHSE successfully observed weak-power optical systems, observation nonlinear resulting solitons remains so far elusive, mainly due to high energy...

Here we experimentally demonstrate the dynamics of Bloch-Zener oscillations (BZOs) in a synthetic temporal lattice formed by optical pulses coupled fiber loops. By periodically modulating phases imposed to linear driven lattices, two-band Floquet system with tunable bandgaps is realized, and related BZOs that occurred this are displayed. On basis, manipulating phase difference coupling angle lattice, widths 0-gap

A waveguide coupler under periodically cascaded dielectric modulation is proposed to generate a Floquet lattice in synthetic frequency dimension. The bands may hold linear the entire Brillouin zone, referred as Dirac and giving rise nondiffracting shifts. direction of shift depends on component incident transverse modes, analogous spin-momentum locking realized driven ultracold atoms recently. Furthermore, shape can be flexibly adjusted by applying external voltage, resulting tunable group...

Abstract Dynamic localization (DL) of photons, i.e., the light-motion cancellation effect arising from lattice’s quasi-energy band collapse under a synthetic ac-electric-field, provides powerful and alternative mechanism to Anderson for coherent light confinement. So far only low-order DLs, corresponding weak ac-fields, have been demonstrated using curved-waveguide lattices where waveguide’s bending curvature plays role ac-field as required in original Dunlap-Kenkre model DL. However,...