We demonstrate the first experimental realization of a dispersionless state, in photonic Lieb lattice formed by an array optical waveguides. This engineered supports three energy bands, including perfectly flat middle band with infinite effective mass. analyze, both experimentally and theoretically, evolution well-prepared flat-band states, show their remarkable robustness, even presence disorder. The states lattices opens exciting door towards quantum simulation models highly controllable...

Abstract Topological quantum matter can be realized by subjecting engineered systems to time-periodic modulations. In analogy with static systems, periodically driven topologically classified topological invariants, whose non-zero value guarantees the presence of robust edge modes. high-frequency limit drive, topology is described standard such as Chern numbers. Away from this limit, these numbers become irrelevant, and novel invariants must introduced capture transport. The corresponding...

Topological materials exhibit properties dictated by quantised invariants that make them robust against perturbations. This topological protection is a universal wave phenomenon applies not only in the context of electrons solid-state but also to photonic systems, ultracold atoms, mechanical circuits, exciton-polaritons and beyond. However, vast majority research these systems has focused on linear domain, i.e., where inter-particle interactions do play role. Here, we experimentally observe...

We report on the experimental realization of a uniform synthetic magnetic flux and observation Aharonov-Bohm cages in photonic lattices. Considering rhombic array optical waveguides, we engineer modulation-assisted tunneling processes that effectively produce nonzero per plaquette. This field for light can be tuned at will by varying phase modulation. In regime where half quantum is realized each plaquette, all energy bands dramatically collapse into nondispersive (flat) eigenstates are...

Higher-order topological insulators are a recently discovered class of materials that can possess zero-dimensional localized states regardless the dimension system. Here, we experimentally demonstrate corner-localized modes higher-order systems be symmetry-protected bound in continuum; these do not hybridize with surrounding bulk lattice even absence band gap. This observation expands scope bulk-boundary correspondence by showing protected boundary-localized found within bands, addition to...

We experimentally demonstrate the photonic realization of a dispersionless flat band in quasi-one-dimensional lattice fabricated by ultrafast laser inscription. In nearest neighbor tight binding approximation, supports two dispersive and one nondispersive (flat) band. excite superpositions flat-band eigenmodes at input show diffractionless propagation states due to their infinite effective mass. future, use rhombic lattices, together with successful implementation synthetic gauge field, will...

Controlling the stress in glass after laser exposure is of prime importance not only for photonics applications, but also preserving mechanical integrity components general.The sub-surface fused silica to femtosecond pulses can induce a permanent and localized modification structure.In this work, we present evidence that be used continuously tailor material, from tensile compressive state, as pulse energy changed.In addition, demonstrate effect obtained while transitioning between different...

A salient feature of solid-state topological materials in two dimensions is the presence conducting electronic edge states that are insensitive to scattering by disorder. Such unidirectional have been explored many experimental settings beyond systems, including photonic devices, mechanical and acoustic structures, others. It great interest understand how behave inter-particle interactions nonlinearity. Here we experimentally demonstrate soliton-like nonlinear on insulators consisting...

The interplay of $\pi$-flux and lattice geometry can yield full localization quantum dynamics in systems, a striking interference phenomenon known as Aharonov-Bohm caging. At the level single-particle energy spectrum, this full-localization effect is attributed to collapse Bloch bands into set perfectly flat (dispersionless) bands. In such models, effects inter-particle interactions generally lead breaking cages, hence, spreading wavefunction over lattice. Motivated by recent experimental...

Abstract Photonic lattices—arrays of optical waveguides—are powerful platforms for simulating a range phenomena, including topological phases. While probing dynamics is possible in these systems, by reinterpreting the propagation direction as time, accessing long timescales constitutes severe experimental challenge. Here, we overcome this limitation placing photonic lattice cavity, which allows state to evolve through multiple times. The accompanying detection method, exploits multi-pixel...

We report the ultrafast laser fabrication and mid-IR characterization (3.39 microns) of four-port evanescent field directional couplers. The couplers were fabricated in a commercial gallium lanthanum sulphide glass substrate using sub-picosecond pulses 1030 nm light. Straight waveguides inscribed optimal parameters found to exhibit propagation losses 0.8 dB/cm. A series with different interaction lengths, we demonstrate power splitting ratios between 8% 99% for light wavelength 3.39 microns....

We report on the experimental realization of a photonic system that simulates one-dimensional two-particle Hubbard model. This analogy is realized by means two-dimensional arrays coupled optical waveguides, fabricated using femtosecond laser inscription. By tuning analogous ``interaction strength,'' we reach strongly interacting regime Hamiltonian, and demonstrate suppression standard tunneling for individual ``particles.'' In this formation bound states identified through direct observation...

We observe Wannier–Stark (W–S) localization in curved photonic lattices, realized using arrays of evanescently coupled optical waveguides. By correctly tuning the strength inter-site coupling lattice, we that W–S states become increasingly localized, and eventually fully localized to one site, as curvature lattice is increased. then demonstrate tunneling can be successfully restored by applying a resonant sinusoidal modulation position, an effect direct analogue photon-assisted tunneling....

Abstract Discrete spatial solitons are self-consistent solutions of the discrete nonlinear Schrödinger equation that maintain their shape during propagation. Here we show, using a pump-probe technique, soliton formation can be used to optically induce and control linear topological end state in bulk Su–Schrieffer–Heeger lattice, evanescently-coupled waveguide arrays. Specifically, observe an abrupt nonlinearly-induced transition above certain power threshold due inversion symmetry-breaking...

We demonstrate that a flat-band state in quasi-one-dimensional rhombic lattice is robust the presence of external drivings along axis. The was formed by periodic arrays evanescently coupled optical waveguides, and were realized modulating paths waveguides. excited superposition eigenmodes at input observed this does not diffract static, as well high-frequency sinusoidal drivings. This localization due to destructive interference analogous wavefunction associated with symmetry geometry. then...

We report on the experimental realization of a quasi-one-dimensional photonic graphene ribbon supporting four flat-bands (FBs). study dynamics fundamental and dipolar modes, which are analogous to s p orbitals, respectively. In experiment, both modes (orbitals) effectively decoupled from each other, implying two sets six bands, where them completely flat (dispersionless). Using an image generator setup, we excite FB demonstrate their non-diffracting propagation for first time. Our results...

Optical devices like virtual reality (VR) headsets present challenges in terms of vergence-accommodation conflict that leads to visual fatigue for the user over time. Lenses available meet these include liquid crystal (LC) lenses, which possess a response time millisecond range. This is slow, while accessing multiple focal lengths. A ferroelectric (FLC) has microsecond In this article, we disclose switchable lens device having combination fast FLC-based polarization rotation unit and passive...

We present measurements of the superfluid density and heat capacity thin films $^{4}\mathrm{He}$ adsorbed in aerogel glass. find that critical behavior for with transition temperatures between 50 mK 1 K is similar to seen on Vycor. Power-law observed over at least one order magnitude reduced temperature an exponent \ensuremath{\zeta}=0.63\ifmmode\pm\else\textpm\fi{}0.03. This much smaller than value 0.811\ifmmode\pm\else\textpm\fi{}0.004 found when pores were filled helium. also unchanged by...

We report the observation of electric field induced random lasing in a dye doped liquid crystal system. This was achieved by using host with negative dielectric anisotropy laser PM 597 75 μm cell homeotropic alignment layer. In absence an applied field, only amplified spontaneous emission observed since orientation uniform. However, application resulted field-induced planar-like configuration local nonuniformity orientation. led to energized state (voltage greater than transition threshold)....

Floquet solitons are shape-preserving nonlinear wave packets exhibiting periodic micromotion during propagation. Here we propose and experimentally demonstrate a family of period-doubled in the bulk photonic topological insulator. Unlike traditional states, function soliton repeats itself after two periods, apart from an overall phase factor associated with quasienergy. Our experimental system consists periodically modulated honeycomb lattices optical waveguides fabricated by femtosecond...

Wavelength-to-time mapping (WTM)—stretching ultrashort optical pulses in a dispersive medium such that the instantaneous frequency becomes time-dependent—is usually performed using single-mode fiber. In number of applications, as time-stretch imaging (TSI), use this fiber during WTM limits achievable sampling rate and quality. Multimode based is potential route to overcome challenge project more diverse range light patterns. Here, we demonstrate two-dimensional single-photon avalanche diode...

Abstract Detection of long wave infrared (LWIR) light at room temperature is a long‐standing challenge due to the low energy photons. A low‐cost, high‐performance LWIR detector or camera that operates under such conditions pursued for decades. Currently, all available detectors operate based on amplitude modulation (AM) and are limited in performance by AM noises, including Johnson noise, shot background fluctuation noise. To address this challenge, frequency (FM)‐based detection technique...