We demonstrate electro-optic switching using the DC-Kerr effects in a bus-coupled integrated photonic racetrack ring resonator made of Silicon-rich Nitride and find its third order nonlinear susceptibility, χ (3) , of 6x10 -19 m2/v2.
We numerically compare the self-focusing of a Gaussian beam in bulk media to that of guided modes in a cylindrical rod waveguide. We demonstrate delivery of higher power than anticipated from the bulk media calculations.
We demonstrate light localization in a frustrated fractal-like photonic lattice owing multiple flat bands fabricated by femtosecond direct laser writing. We investigate the arising flat bands depending on the singularities of their Bloch wave functions.
We demonstrate the existence of temporal solitons in a laser pumped below its oscillation threshold. Through bifurcation analysis and experimental measurements, we show how the gain saturation impacts this new localized structure.
We model waveguide lattices by vortex-beam arrays in turbulent Kerr media. We investigate localized probe states as flat bands, topological edge states, and Anderson localization. By four-wave mixing, we control the excitation and localization robustness.
We study a generic model governing optical beam propagation in media featuring a nonlocal nonlinear response, namely a two-dimensional defocusing nonlocal nonlinear Schrödinger (NLS) model. Using a framework of multiscale expansions, the NLS model is reduced first to a bidirectional model, namely a Boussinesq or a Benney-Luke-type equation, and then to the unidirectional Kadomtsev-Petviashvili (KP) equation – both in Cartesian and cylindrical geometry. All the above models arise in the description of shallow water waves, and their solutions are used for the construction of relevant soliton solutions of the nonlocal NLS. Thus, the connection between water wave and nonlinear optics models suggests that patterns of water may indeed exist in light. We show that the NLS model supports intricate patterns that emerge from interactions between soliton stripes, as well as lump and ring solitons, similarly to the situation occurring in shallow water.
We realize nanophotonic integrated circuits in thin-film InGaP with a record- high second-order optical nonlinearity over 1%, measured by the ratio between single- photon coupling rate ( g /2 π = 8 . 3 MHz) and intrinsic cavity photon loss rate.
We study artificial neural networks with nonlinear waves as a computing reservoir. We discuss universality and the conditions to learn a dataset in terms of output channels and nonlinearity. A feed-forward three-layered model, with an encoding input layer, a wave layer, and a decoding readout, behaves as a conventional neural network in approximating mathematical functions, real-world datasets, and universal Boolean gates. The rank of the transmission matrix has a fundamental role in assessing the learning abilities of the wave. For a given set of training points, a threshold nonlinearity for universal interpolation exists. When considering the nonlinear Schrödinger equation, the use of highly nonlinear regimes implies that solitons, rogue, and shock waves do have a leading role in training and computing. Our results may enable the realization of novel machine learning devices by using diverse physical systems, as nonlinear optics, hydrodynamics, polaritonics, and Bose-Einstein condensates. The application of these concepts to photonics opens the way to a large class of accelerators and new computational paradigms. In complex wave systems, as multimodal fibers, integrated optical circuits, random, topological devices, and metasurfaces, nonlinear waves can be employed to perform computation and solve complex combinatorial optimization.
Presented are tubular, or wormhole solitons in a ring cavity filled with a medium with nonlinear amplification and absorption. Depending on the cavity length, their vortex lines are straight or curved single or multiple spirals.
The third-order nonlinear optical coefficients of Si and GaAs have been characterized in the near-infrared using a comprehensive approach to ensure accuracy and to address the large variation in the published coefficients.
High harmonic generation (HHG) versus the crystal orientation of a monolayer MoS 2 is investigated experimentally. It is found that the laser wavelength and the multiband electronic structure plays an important role in HHG process.
We demonstrate attosecond control of the multi-photon multiple ionization of argon. While a weakly oscillating Ar2+ is found in an autocorrelation measurement, the Ar3+ ion yield strongly oscillates due to direct multi-photon absorption.
The emergence of an exceptional point and spontaneous PT-symmetry breaking when optical parametric amplification and idler second harmonic generation are simultaneously phase matched leads to behavior characteristic of non-Hermitian systems in a fully Hermitian system.
We propose two schemes for efficient continuous-wave terahertz generation based on lithium niobate on insulator platform via DFG. The efficiencies are as high as 2.1×10 -2 W -1 at 3 THz and 1.2×10 -3 W -1 at 300 GHz.
We investigate polarization conversion between two linearly polarized soli- tons in microstructured birefringent optical fibers. The soliton polarized along the fast axis transfers energy to the orthogonal polarization. The two components have matched group velocities.
We present an epsilon-near-zero metamaterial consisting of a subwavelength periodic stack of metal and dielectric layers with enhanced nonlinear optical response in its zero-permittivity wavelength. This ENZ condition can be tuned by adjusting layer thickness.
We show that the second harmonic generation from a subwavelength bi-metal dimer has some unique features that set it apart from the conventional view of this case. A model based on quasistatic interactions between oscillating charges is in good agreement with experiments. Based on this model, we explore higher harmonics generation, optical rectification, and chaos.
High harmonic generation (HHG) and electron excitation by intense mid-IR pulses upon photo-carrier doping have been investigated. We observe a damped HHG and increased electron excitation process as a function of the free electron density.
We demonstrate a phase-sensitive amplifier i n t hin-film pe riodically poled lithium niobate with 30 dB gain, capable of amplifying 35-fs pulses at 2 µm using less than 2 pJ of pump energy.
It is widely accepted by the scientific community that the majority of the universe (~95%) is made of dark matter and is majorly contributes to the formation of galaxies in the universe. Since, the dark matter can’t absorb or emit electromagnetic radiation, the only possible way for the detection is to observe the gravitation interactions between it and the ordinary matter which requires huge laboratory space requirements and not suitable for space-based observations (in ISS Environments). As an alternative approach, the dark matter induces its effects on atomic/optical transitions in which optical clocks are locked into, and by measuring those changes in frequency transitions, the scalar dark matter can be detected. This can be measured precisely with mode locked frequency combs but are bulky in nature. Since ISS environment always opts for the low footprint devices, and here in this work, we are proposing Cascaded Silicon Nitride Microring resonators (Photonic Molecule) for generating easily accessible soliton states combined with the co-propagating distinct Kerr solitons to increase the sensitivity of the device and achieve faster acquisition speeds. The results of identifying the alterations of optical transitions can be calculated by taking the ratio of two different optical clocks (O A and O B ) in Lumerical software using scripts as different clocks varies differently to the varying fine structure constant.
