Abstract Nanoscale modal confinement is known to radically enhance the effect of intrinsic Kerr and Raman nonlinearities within nanophotonic silicon waveguides. By contrast, stimulated Brillouin-scattering nonlinearities, which involve coherent coupling between guided photon phonon modes, are stifled in conventional nanophotonics, preventing realization a host Brillouin-based signal-processing technologies silicon. Here we demonstrate Brillouin scattering waveguides, for first time, through...

Rapid progress in integrated photonics has fostered numerous chip-scale sensing, computing and signal processing technologies. However, many crucial filtering delay operations are difficult to perform with all-optical devices. Unlike photons propagating at luminal speeds, GHz-acoustic phonons moving slower velocities allow information be stored, filtered delayed over comparatively smaller length-scales remarkable fidelity. Hence, controllable efficient coupling between coherent enables new...

We develop a general framework of evaluating the gain coefficient Stimulated Brillouin Scattering (SBS) in optical waveguides via overlap integral between and elastic eigen-modes. show that spatial symmetry force dictates selection rules excitable modes. By applying this method to rectangular silicon waveguide, we demonstrate distributions eigen-modes jointly determine magnitude scaling SBS both forward backward processes. further apply inter-modal process, coupling distinct modes are...

Quantum lithography (QL) has been suggested as a means of achieving enhanced spatial resolution for optical imaging, but its realization held back by the low multiphoton detection rates recording materials. Recently, an centroid measurement (OCM) procedure was proposed way to obtain enhancement identical that QL with higher efficiency (M. Tsang, Phys. Rev. Lett. 102, 253601 (2009)). Here we describe variation OCM method still based on use photon-number-resolving detection. We also report...

We fabricated various optical devices on a hybrid Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> –LiNbO platform for integrated quantum photonic circuits and observed Hong–Ou–Mandel (HOM) interference. Strip-loaded waveguides were prepared via deposition LiNbO . Consequently, fundamental building blocks photonics, such as ring resonators, beam splitters, Mach–Zehnder...

Typically, low-order nonlinearities are much stronger than high-order nonlinearities. In this Letter, we demonstrate a procedure by which strong can be synthesized out of Our involves the use previously largely overlooked process microscopic cascading, results from local-field effects. We have performed an experiment that allows us to distinguish influence cascading more-well-known macroscopic and find conditions under dominant effect. The ability create large nonlinear response could prove...

Ghost imaging can be performed using either quantum or classical states of light that possess strong spatial correlations. In both cases, the image is formed by averaging over many optical events. Here we show it possible to distinguish an object from a preestablished basis set objects small number position-correlated photon pairs produced spontaneous parametric down-conversion. The signal incident on one member spatially nonoverlapping objects. "ghost" information impressed upon separated...

The examination of entanglement across various degrees freedom has been pivotal in augmenting our understanding fundamental physics, extending to high dimensional quantum states, and promising the scalability technologies. In this paper, we demonstrate photon number path frequency domain by implementing a beam splitter that converts single-photon another with 50% probability using Bragg scattering four-wave mixing. two-photon NOON state single-mode fiber is generated domain, manifesting...

We quantify the strength of stimulated forward Brillouin scattering in hollow-core photonic bandgap fiber through a combination experiments and multi-physics simulations. spectroscopy methods reveal family densely spaced Brillouin-active phonon modes below 100 MHz with coupling strengths that approach those conventional silica fiber. The experimental results are corroborated by simulations, revealing relatively strong optomechanical is mediated electrostriction radiation pressure within...

When a pulse superposed on cw background propagates through an erbium-doped fiber amplifier with negative group velocity, either broadening or compression can be observed. These effects explained in terms of two competing mechanisms: gain recovery and spectrum broadening. The distortion the shape caused by these depends input width, pump power, background-to-pulse power ratio. With proper choice three parameters, we obtain significant advancement minimal distortion.

Anti-parity-time (APT) symmetry is associated with various effects beyond the fundamental limitations implied in standard Hermitian-Hamiltonian dynamics. Here, we create an optical APT-symmetric system a synthetic frequency domain using conventional fiber without intrinsic gain or loss and experimentally reveal photonic effects, including energy-difference conservation synchronized power oscillation, which have not yet been confirmed domain. The fiber-based has long interaction length...

An on-chip quantum light source based on spontaneous four-wave mixing is an essential element for developing photonic integrated circuit technology, which has the advantage of no connection loss owing to integration into circuits. The waveguide-based inevitably causes propagation imperfections in fabrication process, but effects photon-pair generation have not been extensively studied. In this study, were examined using theoretical and experimental methods. theory, performance sources, such...

Spontaneous parametric down-conversion (SPDC) has become a key method for generating entangled photon pairs. Periodically poled thin-film lithium niobate (TFLN) waveguides induce strong SPDC but require complex fabrication processes. In this work, we experimentally demonstrate efficient and second harmonic generation using modal phase matching methods. This is achieved with inverse-designed optical mode converters low-loss in single nanofabrication process. Inverse design methods provide...

We investigate the propagation of optical pulses through two different solid-state materials, ruby and alexandrite, for which group velocity can be very small () or superluminal ( negative). find that smooth fractional delay advancement is maximized use with durations comparable to response time physical process—coherent population oscillations—that leads these extreme velocities. However, we transmitted pulse shape becomes distorted unless much longer shorter than this time. also...

A nonlinear optical, phase-shifted-grating method for improving the resolution of feature sizes is implemented experimentally using an N-photon lithographic material. For recording medium, we used poly(methyl-methacrylate) (PMMA), which a UV material that can be excited by multi-photon absorption in visible region. We achieved two-fold enhancement over standard Rayleigh limit half wavelength.

We measure the nonlinear susceptibility of Bi3.25La0.75Ti3O12 (BLT) thin films grown on quartz substrates using Z-scan technique with picosecond laser pulses at a wavelength 532 nm. The third-order refractive index coefficient γ and absorption β BLT film are 3.1×10−10 cm2/W 3×10−5 cm/W, respectively, which much larger than those most ferroelectric films. results show that good candidate materials for applications in optical devices.

We can encode an image from orthogonal basis set onto a single photon downconverted pair via the use of amplitude mask. then discriminate imprinted on other images in using holographic-matched filtering techniques. demonstrate this procedure experimentally for space two objects, and we discuss possibility applying method to much larger space. This process could have important implications manipulation at quantum level.

The development of quantum photonic information technology demands high-quality photon sources. Here we demonstrate a low-noise and high-speed source generated by the spontaneous four-wave mixing process in micro/nanofiber (MNF). pair generation MNF is tailorable controlling its diameter designed for creating signal idler photons silicon-based detector wavelength range, yielding high detection efficiency coincidence count rate. This can be coupled to other fiber systems with negligible...

An on-chip optical power splitter is a key component of photonic signal processing and quantum integrated circuits requires compactness, wideband, low insertion loss, variable splitting ratio. However, designing an with both customizable ratio wavelength independence big challenge. Here, we propose tailorable broadband over 100 nm loss less than 0.3%, as well compact footprint, based on 1×2 interleaved tapered waveguides. The proposed scheme can design the output transverse electric modes,...

A fiber-based photon-pair source in the telecom C-band is suitable for quantum information science including communications. Spontaneous four-wave mixing effects are known to create photon pairs that slightly detuned from pump wavelength only anomalous group-velocity-dispersion (GVD) regime. Here, we achieve high-quality generation normal GVD regime through a dispersion shifted fiber, first time. The exhibit strong temporal correlation with each other and excellent heralded anti-bunching...

Indistinguishability is a crucial element for quantum interference in scalable information processing. Here, we demonstrate the ability to erase distinguishability of nondegenerate two-photon state using Bragg-scattering four-wave mixing (BS-FWM) by tuning idler-photon frequency. We achieve maximum translation efficiency 93.2 ± 2.0% and verify indistinguishability Hong–Ou–Mandel interferometer. The frequency anticorrelation input preserved as states are translated from distinguishable...