Carefully designed micro- and nanocarriers can provide significant advantages over conventional macroscopic counterparts in drug delivery applications. For the successful of bioactive compounds, carriers should possess a high loading capacity, triggered release mechanisms, biocompatibility, biodegradability. Porous calcium carbonate (CaCO3) is one most promising platforms, which encompass all aforementioned requirements. Here, we study both formation particles biological applicability CaCO3....

We introduce a novel hybrid metal–dielectric nanoantenna composed of dielectric (crystalline silicon) and metal (silver) nanoparticles. In such nanoantenna, the phase shift between dipole moments nanoparticles, caused by differences in polarizabilities, allows for directional light scattering; while nonlinearity nanoparticle helps to control radiation direction. show that pattern this can be switched forward backward directions varying only intensity around level 6 MW cm−2, with...

Being the polymorphs of calcium carbonate (CaCO3), vaterite and calcite have attracted a great deal attention as promising biomaterials for drug delivery tissue engineering applications. Furthermore, they are important biogenic minerals, enabling living organisms to reach specific functions. In nature, monocrystals typically form self-assembled polycrystal micro- nanoparticles, also referred spherulites. Here, we demonstrate that alpine plants belonging Saxifraga genus can tailor light...

The state of the art in optical biosensing is focused on reaching high sensitivity at a single wavelength by using any type resonance. This common strategy, however, disregards promising possibility simultaneous measurements bioanalyte's refractive index over broadband spectral domain. Here, we address this issue introducing approach in-fibre multispectral sensing (IMOS). operating principle relies detecting changes transmission hollow-core microstructured fibre when bioanalyte streamed...

We study modulational instability in nonlinear arrays of subwavelength metallic nanoparticles and analyze numerically scenarios the development. demonstrate that can lead to formation regular periodic or quasiperiodic modulations polarization. reveal such nanoparticle support long-lived standing moving oscillating localized modes---plasmon oscillons.

Recent experiments in the field of strong optomechanical interactions have focused on either structures that are simultaneously optically and mechanically resonant, or photonic crystal fibers pumped by a laser intensity modulated at mechanical resonant frequency glass core. Here, we report continuous-wave (CW) self-oscillations fiber nanostructure is only resonant. Since mechanism has close similarities to stimulated Raman scattering molecules, it been named Raman-like scattering. The...

Abstract For centuries mankind has been modifying the optical properties of materials: first, by elaborating geometry and composition structures made materials found in nature, later structuring existing at a scale smaller than operating wavelength. Here we suggest an original approach to introduce activity nanostructured materials, theoretically demonstrating that conventional achiral semiconducting nanocrystals become optically active presence screw dislocations, which can naturally...

Abstract Mesoscopic photonic systems with tailored optical responses have great potential to open new frontiers in implantable biomedical devices. However, biocompatibility is typically a problem, as engineering of properties often calls for using toxic compounds and chemicals, unsuitable vivo applications. Here, unique approach biofriendly delivery resonances demonstrated. It shown that the controllable infusion gold nanoseeds into polycrystalline sub‐micrometer vaterite spherulites gives...

It is interesting to pose the question: How best design an optomechanical device, with no electronics, optical cavity, or laser gain, that will self-oscillate when pumped in a single pass only few mW of single-frequency power? One might begin mechanically resonant and highly compliant system offering very high gain. Such system, by light, at its frequency. well-known, however, this occur if group velocity dispersion light enough so phonons causing pump-to-Stokes conversion are sufficiently...

The study of metal nanoparticles plays a central role in the emerging novel technologies employing optics beyond diffraction limit. Combining strong surface plasmon resonances, high intrinsic nonlinearities and deeply subwavelength scales, arrays offer unique playground to develop concepts for light manipulation at nanoscale. Here we suggest principle control localized optical energy chains nonlinear based on fundamental phenomenon modulation instability. In particular, demonstrate that...

Abstract Nanoscale bioimaging is a highly important scientific and technological tool, where fluorescent (FL) proteins, organic molecular dyes, inorganic quantum dots, lately carbon dots are widely used as light emitting biolabels. In this work, new class of visible FL bioorganic nanodots, self‐assembled from short peptides different composition origin, introduced. It shown that the electronic energy spectrum native nonfluorescent peptide nanodots (PNDs) deeply modified upon thermally...

We study nonlinear modes in arrays of doped graphene nanodisks with Kerr-type response the presence an external electric field. introduce a theoretical model describing evolution nanodisks' polarizations taking into account intrinsic losses and dipole-dipole coupling between nanodisks. reveal that this system can support discrete dissipative scalar solitons both longitudinal transverse polarizations, as well vector composed two mutually coupled polarization components. demonstrate formation...

Interference phenomena allow tailoring propagation of electromagnetic waves by controlling phases several scattering channels. Huygens element, being a representative example this approach, enables enhancement the from an object in forward direction, while reflection is suppressed. However, typical resonant realization element employs constructive interference between electric and magnetic dipolar resonances that makes it relatively narrowband. Here we develop concept broadband based on...

We analyze nonlinear effects in optically driven arrays of metallic nanoparticles. demonstrate that such plasmonic systems are characterized by a bistable response, and they can support the propagation dissipative switching waves (or kinks) connecting states with different polarization. study numerically properties kinks which subwavelength extent tunable velocity.

We introduce the concept of a nanoradar based on operation nonlinear plasmonic nanoantenna. The action originates from modulational instability occurring in dimer nanoantenna consisting two subwavelength nanoparticles. Modulation causes dynamical energy exchange between eigenmodes resulting periodic scanning scattering pattern. Such demonstrates wide sector, low threshold, and ultrafast time response being potentially useful for many applications nanophotonics circuitry.

Electromagnetic scattering bounds on subwavelength structures play an important role in estimating performance of antennas, radio frequency identification tags, and other wireless communication devices. An appealing approach to increase a cross section is accommodating several spectrally overlapping resonances within structure. However, numerous fundamental practical restrictions have been found led the formulation Chu-Harrington, Geyi, limits, which provide upper bound efficiencies. Here we...

Bistability is widely exploited to demonstrate all-optical signal processing and light-based computing. The standard paradigm of switching between two steady states corresponding "0" "1" bits based on the rule that a transition occurs when pulse intensity overcomes bistability threshold, otherwise, system remains in initial state. Here, we break with this concept by revealing phenomenon indefinite which eventual state resonant bistable transformed into nontrivial function parameters for...

We describe the properties of specific non-reflecting birefringent left-handed metamaterials and demonstrate a perfect lens for vectorial fields. predict that, in sharp contrast to concept conventional realized at = μ −1 (where is dielectric permittivity magnetic permeability), slab possesses property negative refraction either TE- or TM-polarized waves both them simultaneously. This allows selective focusing spatial separation images created different polarizations. discuss several...

We suggest an alternative way of terahertz radiation generation utilizing the effect spontaneous symmetry breaking in a nonlinear metallic nanodimer illuminated by light. show that is caused instability plasmon eigenmodes system and can lead either to magnetization dimer or periodic self-modulation regime light scattering. find modulation frequency lies band may be tuned within wide range.

We propose an alternative technique of continuous-wave terahertz radiadion generation based on light scattering by a two-dimensional flat lattice nonlinear metallic nanodimers. show that it may be accompanied plasmon-driven modulation instability the polarization resulting in periodic oscillations both transmitted and reflected envelopes. find frequency lies band can tuned within wide range, from units up to several tens terahertz, varying incident intensity frequency. also compare suggested...

A novel famility of optical resonances driven by Cartesian anisotropy is demonstrated in calcite and vaterite nanoparticles.

The freely-suspended glass membranes in a dual-nanoweb fiber, driven at resonance by intensity-modulated light, exhibit giant optomechanical nonlinearity. We experimentally investigate the effect of squeezed-film damping exploring pressure dependence resonant frequency and mechanical quality factor. As consequence unusually narrow slot between nanowebs (22 μm 550 nm), gas-spring causes pressure-dependent shift that is ∼15 times greater than typically measured micro-electro-mechanical...

We consider light scattering by a coated magnetoplasmonic nanoparticle with Kerr-type nonlinear plasmonic shell and magneto-optic core. Such structure features two plasmon dipole modes, associated electronic oscillations on the inner outer surfaces of shell. Driven in regime, each mode exhibits bistable response. Bistability an leads to switching between this state Fano resonance (Fano switching). Once external intensity exceeds critical value, bistability zones both eigenmodes overlap,...

Structured environments are employed in a plethora of applications to tailor dynamics light–matter interaction processes by modifying the structure electromagnetic fields. The promising example such system is antiresonant photonic crystal fibers (AR-PCFs), which allow light–analyte interactions very long channel. Here we probe contribution microstructuring and nontrivial mode hierarchy on AR-PCFs investigating lifetime shortening perovskite ( <mml:math...