Wave interference is a fundamental manifestation of the superposition principle with numerous applications. Although in conventional optics, occurs between waves undergoing different phase advances during propagation, we show that vectorial structure near field an emitter essential for controlling its radiation as it interferes itself on interaction mediating object. We demonstrate near-field circularly polarized dipole results unidirectional excitation guided electromagnetic modes field, no...

Abstract Optical forces allow manipulation of small particles and control nanophotonic structures with light beams. While some techniques rely on structured to move using field intensity gradients, acting locally, other optical can ‘push’ a wide area illumination but only in the direction propagation. Here we show that spin–orbit coupling, when spin incident circularly polarized is converted into lateral electromagnetic momentum, leads force placed above substrate, associated recoil...

Bacteria often encounter physico-chemical stresses that disrupt division, leading to filamentation, where cells elongate without dividing. While this adaptive response enhances survival, it also exposes filaments significant mechanical strain, raising questions about the mechanochemical feedback in bacterial systems. In study, we investigate how strain influences Min oscillatory system, a reaction-diffusion network central division Escherichia coli . Through multidisciplinary approach...

We demonstrate experimentally all-optical switching on a silicon chip at telecom wavelengths. The device comprises compact ring resonator formed by horizontal slot waveguides filled with highly nonlinear nanocrystals in silica. When pumping power levels about 100 mW using 10 ps pulses, more than 50% modulation depth is observed the switch output. performs 1 order of magnitude faster previous approaches and fully fabricated complementary metal oxide semiconductor technologies.

We experimentally demonstrate a low-loss multilayered metamaterial exhibiting double-negative refractive index in the visible spectral range. To this end, we exploit second-order magnetic resonance of so-called fishnet structure. The nature employed resonance, together with effect interacting adjacent layers, results figure merit as high 3.34. A wide range negative is achieved, covering wavelength region between 620 and 806 nm only two different designs.

We study analytically and numerically the far-field extraordinary optical transmission (EOT) through double-layer metallic grating structures patterned with subwavelength hole arrays. In addition to EOT phenomena due well-known surface plasmon polaritons (SPPs) on outer surfaces such as those a single layer array, further peaks are observed. The separation between layers is small enough allow SPPs propagating inner interfaces couple form an internal SPP, different dispersion relation from...

We discuss the simultaneous existence of phononic and photonic band gaps in a periodic array holes drilled Si membrane. investigate detail both centered square lattice boron nitride (BN) with two atoms per unit cell which include simple square, triangular honeycomb lattices as particular cases. show that complete can be obtained from well BN close to honeycomb. Otherwise, all investigated structures present possibility gap together given symmetry, odd or even, depending on geometrical parameters.

The efficient manipulation of circularly polarized light with the proper handedness is key in many photonic applications. Chiral structures are capable distinguishing photon handedness, but while photons right polarization captured, those opposite rejected. In this work, we demonstrate a planar nanostructure no chirality consisting silicon microdisk coupled to two waveguides. device distinguishes an incoming beam by driving spins toward different Experimental results close agreement...

Abstract Optical nonlinearities, such as thermo-optic mechanisms and free-carrier dispersion, are often considered unwelcome effects in silicon-based resonators and, more specifically, optomechanical cavities, since they affect, for instance, the relative detuning between an optical resonance excitation laser. Here, we exploit these nonlinearities their intercoupling with mechanical degrees of freedom a silicon nanobeam to unveil rich set fundamentally different complex dynamics. By smoothly...

Optomechanical upconversion Molecules have rich signatures in their spectra at infrared wavelengths and are typically accessed with dedicated spectroscopic instrumentation. Chen et al . Xomalis report optomechanical frequency from the mid-infrared to visible domain using molecular vibrations coupled a plasmonic nanocavity ambient conditions (see Perspective by Gordon). Using different nanoantenna designs, one nanoparticle-on-resonator other nanoparticle-in-groove, both approaches show...

Coherent interconversion of signals between optical and mechanical domains is enabled by optomechanical interactions. Extreme light-matter coupling produced confining light to nanoscale mode volumes can then access single mid-infrared (MIR) photon sensitivity. Here we utilise the infrared absorption Raman activity molecular vibrations in plasmonic nanocavities demonstrate frequency upconversion. We convert {\lambda}~10 {\mu}m incoming visible via surface-enhanced scattering (SERS)...

A novel all-optical switching structure based on a photonic crystal directional coupler is proposed and analyzed. Efficient optical achieved by modifying the refractive index of coupling region between coupled waveguides means an control signal that confined in central region. Small length (around 1.1 mm) low power consumption (over 1.5 W) are main features estimated for this structure.

Two different silicon slot waveguide configurations are thoroughly analyzed to achieve the optimum nonlinear performance. In region, a complementary metal-oxide-semiconductor-compatible material made by nanocrystals embedded in silica (SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) has been considered. This demonstrated very promising characteristics for applications. The parameters each configuration first designed maximum field...

Abstract The interaction of light and sound waves at the micro nanoscale has attracted considerable interest in recent years. main reason is that this responsible for a wide variety intriguing physical phenomena, ranging from laser-induced cooling micromechanical resonator down to its ground state management speed guided pulses by exciting waves. A common feature all these phenomena feasibility tightly confine photons phonons similar wavelengths very small volume. Amongst different...

Full measurement of the polarization light at nanoscale is expected to be crucial in many scientific and technological disciplines. Ideally, such measurements will require miniaturized Stokes polarimeters able determine nondestructively, locally, real time. For maximum robustness measurement, should also operate optimally. Recent approaches making use plasmonic nanostructures or metasurfaces are not fulfill all these requirements simultaneously. Here, we propose demonstrate a method for...

We demonstrate theoretically that photons and acoustic phonons can be simultaneously guided slowed down in specially designed nanostructures.Phoxonic crystal waveguides presenting simultaneous phononic photonic band gaps were perforated silicon membranes conveniently obtained using silicon-on-insulator technology.Geometrical parameters for first chosen optical wavelengths around 1550 nm, based on the finite element analysis of a perfect phoxonic circular holes.A plain core waveguide was then...

The synchronization of coupled oscillators is a phenomenon found throughout nature. Mechanical are paradigmatic examples, but synchronizing their nanoscaled versions challenging. We report the mechanical dynamics pair optomechanical crystal cavities that, in contrast to previous works performed similar objects, intercoupled with link and support independent optical modes. In this regime they oscillate antiphase, which agreement predictions our numerical model that considers reactive...

A new general expression for the optical chirality density in lossless and lossy dispersive media is applicable to many material systems including among others dielectrics, plasmonic nanostructures, left-handed metamaterials.

Dynamical radiation pressure effects in cavity optomechanical systems give rise to self-sustained oscillations or `phonon lasing' behavior, producing stable oscillators up GHz frequencies nanoscale devices. Like photonic lasers, phonon lasing normally occurs a single mechanical mode. We show here that phase-locked, multimode can be established system through Floquet dynamics induced by temporally modulated laser drive. demonstrate this concept suitably engineered silicon nanocavity coupled...

A novel approach to reduce the coupling length and increase coefficient in waveguide directional couplers implemented on two-dimensional (2-D) photonic crystals (PhC) is proposed. To of a 2-D PhC coupler, which composed two parallel waveguides separated by one or several rows rods, radius rods between both reduced. The application this feature ultrasmall channel interleavers wavelength demultiplexers addressed.

We show that a second-order magnetic resonance present in the fishnet metamaterial can be enhanced so as to achieve simultaneous negative permittivity and permeability visible range. The double-negative behavior leads reduced losses this particular metamaterial. also study stacking of several functional layers, verifying convergence refractive index.

We study theoretically the simultaneous existence of phononic and photonic band gaps in a periodic array silicon pillars deposited on homogeneous thin silica plate. Several lattices, namely, square, triangular, honeycomb are investigated for wide range geometrical parameters. discuss most suitable cases dual phononic-photonic gaps, especially comparison to more conventional structures constituted by holes membrane.

In this work, we report the design, fabrication, and characterization of gold nanocrosses for chemosensing purposes. The are designed to exhibit a localized surface plasmon resonance which is very sensitive refractive index changes in surrounding medium, resulting sensitivity values around 500–700 nm per unit at wavelengths 1.4 μm. We experimentally demonstrate functionalization successful sensing chemical monolayers.

Light–matter interaction at optical frequencies is mostly mediated by the electric component of electromagnetic field, with magnetic usually being considered negligible. Recently, it has been shown that properly engineered metallic nanostructures can provide a response originated from real or virtual flows current in structure. In this work, we demonstrate plasmonic mode which emerges closely spaced thick gold nanorings. The resonance obtains dipole character sufficiently increasing height...