We point out that electromagnetic one-way edge modes analogous to quantum Hall states, originally predicted by Raghu and Haldane in 2D photonic crystals possessing Dirac point-derived band gaps, can appear more general settings. show the TM a gyromagnetic crystal be formally mapped electronic wave functions periodic field, so only requirement for existence of is Chern number all bands below gap nonzero. In square-lattice yttrium-iron-garnet operating at microwave frequencies, which lacks...

We develop a general temporal coupled-mode theory for multimode optical resonators. This incorporates formal description of direct transmission pathway, and is therefore capable describing Fano interference phenomena in cavities. Using this theory, we prove criterion that governs the existence nonorthogonal modes. The presence modes creates interesting transport properties which can not be obtained normal resonator systems. validate our by comparing its predictions with first-principles...

Topological states of quantum matter exhibit unique disorder-immune surface protected by underlying nontrivial topological invariants the bulk. Such immunity from backscattering makes or edge ideal carriers for both classical and information. So far, matters have been explored only in realms electronics photonics, with limited range bulk properties largely immutable materials. These constraints thus impose severe performance trade-offs experimentally realizable topologically ordered states....

We demonstrate theoretically the existence of one-way electromagnetic modes in a waveguide formed between semi-infinite photonic crystal structure and metal region under static magnetic field. Such provides frequency range where only one propagating direction is allowed. In this range, disorder-induced scattering completely suppressed. also modifies basic properties waveguide-cavity interaction.

We introduce a new all-optical mechanism that can compress the bandwidth of light pulses to absolute zero, and bring them complete stop. The be realized in system consisting waveguide side coupled tunable resonators, which generates photonic band structure represents classical analogue electromagnetically induced transparency. same also achieve time-reversal operation. demonstrate operation such by finite-difference time-domain simulations an implementation crystals.

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...

We propose an optical circulator formed of a magneto-optical cavity in 2D photonic crystal. With spatially engineered magnetic domain structures, the can be designed to support pair counterrotating states at different frequencies. By coupling three waveguides, and by proper matching frequency split modes with strength between waveguide, ideal three-port circulators complete isolation transmission created. present guideline for design needed maximize modal operational bandwidth any given constant.

Stimulated Brillouin scattering in bulk materials and micron-scaled optical fibers has been exploited to realize coherent phonon generation slow light as well new sources. What happens when the size of a light-interacting system is reduced nanoscales? A qualitatively new, several-orders-of-magnitude more powerful form stimulated shown emerge.

The authors show that one-dimensional magneto-optical photonic crystals can achieve one-way total reflection. unit cell of the crystal, which consists two bismuth iron garnet layers with opposite magnetization and one SiO2 layer, is designed to simultaneously break time-reversal, spatial inversion, mirror symmetries. Such are important for creating compact broadband optical isolators.

Narrow bandwidth is a fundamental issue plaguing practical applications of metamaterial absorbers. In this Letter, we show that by deliberately controlling the dispersion and dissipation metamaterial, an ultrawideband perfect absorber with complex-valued constitutive parameters strictly satisfying modified model perfectly matched layer, can be achieved. The nearly power absorption, better than 99%, was experimentally observed in unprecedented 39%, approaching theoretical Rozanov limit. We...

The AGR2 gene encodes a secretory protein that is highly expressed in adenocarcinomas of the esophagus, pancreas, breast, and prostate. This study explores effect expression with well-established vitro vivo assays screen for cellular transformation tumor growth. SEG-1 esophageal adenocarcinoma cells was reduced RNA interference. Cellular examined using NIH3T3 express after stable transfection. cell lines were studied density-dependent anchorage-independent growth, as xenografts nude mice....

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...

Radiation pressure is known to scale large values in engineered micro and nanoscale photonic waveguide systems. In addition radiation pressure, dielectric materials also exhibit strain-dependent refractive index changes, through which optical fields can induce electrostrictive forces. To date, little attention has been paid the component of forces high-index contrast waveguides. this paper, we examine magnitude, scaling, spatial distribution analytical numerical models, revealing that...

Brillouin laser oscillators offer powerful and flexible dynamics as the basis for mode-locked lasers, microwave oscillators, optical gyroscopes in a variety of systems. However, interactions are exceedingly weak conventional silicon photonic waveguides, stifling progress towards silicon-based lasers. The recent advent hybrid photonic-phononic waveguides has revealed to be one strongest most tailorable nonlinearities silicon. Here, we harness these engineered demonstrate lasing Moreover, show...

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...

Electromagnetic materials lacking local time-reversal symmetry, such as gyrotropic materials, are of keen interest and importance both scientifically technologically. Scientifically, topologically nontrivial phenomena, photonic chiral edge states, allow for reflection-free transport even in the presence large disorder. Technologically, nonreciprocal devices, optical isolators circulators, play critical roles communication computing technologies because their ability to eliminate cross-talk...

The determination of optical force as a consequence momentum transfer is inevitably subject to the use proper density and stress tensor. It imperative valuable consider intrinsic scheme photon transfer, particularly when particle embedded in complex dielectric environment. Typically, we submerged an inhomogeneous background composed different materials, excluding coherent illumination or hydrodynamic effects. A ray-tracing method adopted capture direct process from medium, this approach...

A 300 GHz frequency synthesizer incorporating a triple-push VCO with Colpitts-based active varactor (CAV) and divider three-phase injection is introduced. The CAV provides tunability, enhances harmonic power, buffers/injects the fundamental signal from/to divider. locking range of vastly improved due to fact that introduces larger allowable phase change power into loop. Implemented in 90 nm SiGe BiCMOS, achieves phase-noise -77.8 dBc/Hz (-82.5 dBc/Hz) at 100 kHz (1 MHz) offset crystal...

The creation of high-performance narrowband filters is great interest for many RF-signal processing applications. To this end, numerous schemes electronic, MEMS-based, and microwave photonic have been demonstrated. Filtering based on systems offer superior flexibility tunability to traditional RF filters. However, these optical-based are typically limited GHz-widths often large insertion losses, posing challenges integration into high-fidelity radiofrequency circuits. In article, we...

The authors report “field-programmable rectification” in crystals of rutile TiO2. A “programming” voltage is applied between two Pt electrodes on the surface a crystal. Afterwards, current can pass direction programming voltage, but not reverse direction. polarity rectification be reversed by applying opposite sign. effect was observed (110) and (100) surfaces, (001) surface. proposed mechanism field-induced motion oxygen vacancies, which pile up under negative terminal, eliminating Schottky...