Controlling coherent electromagnetic interactions in molecular systems is a problem of both fundamental interest and important applicative potential the development photonic opto-electronic devices. The strength these determines absorption emission properties molecules coupled to nanostructures, effectively governing optical such composite metamaterial. Here we report on observation strong coupling between plasmon supported by an assembly oriented gold nanorods (ANR) exciton. We show that...

Exfoliation of large-area monolayers is important for fundamental research and technological implementation transition-metal dichalcogenides. Various techniques have been explored to increase the exfoliation yield, but little known about underlying mechanism at atomic level. Here, we demonstrate gold-assisted mechanical monolayer molybdenum disulfide, up a centimeter scale. Detailed spectroscopic, microscopic, first-principles density functional theory analyses reveal that strong van der...

We analyze the optical properties of plasmonic nanorod metamaterials in epsilon-near-zero regime and show, both theoretically experimentally, that performance these composites is strongly affected by nonlocal response effective permittivity tensor. provide evidence interference between main additional waves propagating room-temperature develop an analytical description this phenomenon. Additional are present majority low-loss structures should be explicitly considered when designing...

We show that aligned gold nanotube arrays capable of supporting plasmonic resonances can be used as high performance refractive index sensors in biomolecular binding reactions. A methodology to examine the sensing ability inside and outside walls structures is presented. The sensitivity nanotubes found increase are exposed, characteristic shown different. Finite element simulations showed good qualitative agreement with observed behavior. Free standing displayed bulk sensitivities region 250...

A series of thin films comprising gold nanorods embedded in an alumina matrix have been fabricated with lengths ranging from 75 to $330\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. Their optical properties, expressed terms extinction $\ensuremath{-}\mathrm{ln}(T)$, where $T$ is transmittance, measured as a function wavelength, rod length, angle incidence, and incident polarization state. The results are compared Maxwell-Garnett based theory modified take into account the strongly anisotropic...

Arrays of nickel and gold nanorods have been grown on glass silicon substrates using porous alumina templates less than 500 nm thickness. A method is demonstrated for varying the diameter whilst keeping spacing constant. Optical extinction spectra show two distinct maxima associated with transverse longitudinal axes rods. Adding small quantities oxygen to aluminium before anodization found improve sharpness peaks. The spectral position peak shown be sensitive nanorod constant length spacing....

We demonstrate that the coupling between plasmonic modes of oriented metallic nanorods results in formation an extended (guided) mode nanorod array. The electromagnetic field distribution associated to this is found be concentrated within assembly and propagates normally long axes, similar a photonic waveguided by anisotropic slab. This collective determines optical properties assemblies can tuned wide spectral range changing array geometry. geometry represents unique opportunity for light...

The magneto-optical properties of surface-plasmon polaritonic crystals on ferromagnetic substrates have been studied. resonant optical transmission such magneto-plasmonic nanostructures can be efficiently controlled with the applied static magnetic field. effect is explained by influence effects polariton waves supported metal/magnetic–dielectric interface and, in particular, plasmonic bandgap formation.

The electro-optic response of a cell consisting thin layer liquid crystal deposited onto gold nanorods embedded in film alumina with transparent top electrode has been investigated. For p-polarized light incident from the side, extinction peak associated nanorod longitudinal plasmon resonance is completely suppressed. could be recovered by applying an external electric field parallel to long axis nanorods. No suppression observed when was side cell. effect explained polarization properties crystal.

Miniaturized biomedical sensor development requires improvements in lithographic processes terms of cost and scalability. Of particular promise is nanoimprint lithography (NIL), but this can suffer from a lack high-fidelity pattern reproducibility between master imprinted substrates. Herein, we present multidisciplinary investigation into gold- iron-coated NIL sensors including custom optics spectroscopy, scanning probe microscopy, data analysis insights. Polyurethane NIL-made nanodome...

Arrays of gold nanotubes with polypyrrole cores were grown on glass substrates by electrodeposition into thin film porous alumina templates. Measurements optical transmission revealed strong extinction peaks related to plasmonic resonances, which sensitive the polarization state and angle incidence. On prolonging gold, core became fully encapsulated this had a dramatic effect properties arrays, was rationalized finite element simulation local field intensities resulting from plasmon excitation.

Abstract Silver nanorods have been grown by electrodeposition into thin film porous alumina templates (AAO). Optical transmission measurements using p‐polarized incident white light shows clear plasmon resonance extinction peaks. We successfully model the dependence on angle in incidence of peak height and position a multiple–multipoles (MMP) approach with different spectral features being clearly associated effective electric field distribution coupling between individual nanorods.

Confining light in extremely small cavities is crucial nanophotonics, central to many applications. Employing a unique nanoparticle-on-mirror plasmonic structure and using graphene film as spacer, we create nanoscale with volumes of only few tens cubic nanometers. The ultracompact cavity produces strong optical near-fields, which facilitate the formation single carbon quantum dots simultaneously empower coupling between excitons formed dot localized surface plasmons. This manifested...

The fabrication and optical properties of a nanostructured system consisting free-standing metallic nanorods surrounded by dielectric nanoshell are reported. adjustable core−shell geometry allows the resonant to be tuned throughout visible spectrum in 500−900 nm range. shell presents tubular uniform thickness that can varied from fraction nanometer few tens nanometers. This creates well-defined subattoliter volume for integration substance excited or probed. To exemplify such an application,...

Dynamic magnetic properties of arrays Ni nanorods with a low aspect ratio have been investigated. It has shown that the spectra spin-wave resonances localized on typically feature presence zones high density states resulting in characteristic two-peak pattern Stokes and anti-Stokes lines magneto-optical (MO) Brillouin light scattering pronounced Stokes--anti-Stokes (S-AS) asymmetry. A simple theoretical model based analysis elliptic character polarization optical wave interacting dipole...

Abstract Mechanical exfoliation yields high‐quality 2D materials but is challenging to scale up due the small lateral size and low yield of exfoliated crystals. Gold‐mediated macroscale monolayer MoS 2 related crystals addresses this problem. However, it remains unclear whether method can be extended other metals. Herein, mechanical on a range metallic substrates studied. It found that Au outperforms all metals in their ability exfoliate . This rationalized by gold's resist oxidation, which...

For two-dimensional (2D) arrays of metallic nanorods arranged perpendicular to a substrate several methods have been proposed determine the electromagnetic near-field distribution and surface plasmon resonances, but an analytical approach explain all optical features on nanometer length scale has missing date. To fill this gap, we demonstrate here that field in such can be understood basis polaritons (SPPs) propagate along form standing waves. Notably, SPPs couple laterally through their...

Arrays of vertically aligned gold nanotubes are fabricated over several square centimetres which display a geometry tunable plasmonic extinction peak at visible wavelengths and normal incidence. The fabrication method gives control nanotube dimensions with inner core diameters 15–30 nm, wall thicknesses 5–15 nm lengths up to 300 nm. It is possible tune the position through wavelength range 600–900 by varying diameter thickness. experimental data in agreement numerical modelling optical...

There is renewed interest in rare-earth elements and gadolinium particular for a range of studies coupling physics applications. However, it still apparent that synthesis impacts understanding the intrinsic magnetic properties thin films, particularly thicknesses topicality. We report on 50 nm thick nanogranular polycrystalline films SiO2 wafers demonstrate single-crystal like behavior. The maximum in-plane saturation magnetization at 4 K was found to be 4πMS4 = (2.61 ± 0.26) T with...

In this work we present core–shell nanowire arrays of gold coated with a nanometric layer cobalt.

The search for materials or systems exhibiting a high magnetic saturation has been of longstanding importance. It suggested that increased could be achieved by coupling transition metal via spacer to rare earth. We report Gd/Cr/Fe70Co30 multilayer stacks and find reduced yet modulating moment as function Cr thickness. Through micro structural analysis, the lowered is indicated nucleation ultrathin Gd films into face-centered cubic (fcc) phase. discuss possible solution in terms quasi-perfect...

Abstract Despite being the most suitable candidates for solenoid pole pieces in state-of-the-art superconductor-based electromagnets, intrinsic magnetic properties of heavy rare earth metals and their alloys have gained comparatively little attention. With potential integration micro nanoscale devices, thin films Gd, Dy, Tb, DyGd DyTb were plasma-sputtered investigated in-plane properties, with an emphasis on magnetization versus temperature profiles. Based crystal structure analysis...

Extraordinarily high optical contrast is instrumental to research and applications of two-dimensional materials, such as, for rapid identification thickness, characterisation properties, quality assessment. With optimal designs substrate structures light illumination conditions, unprecedented MoS2 on Au surfaces exceeding 430% monolayer over 2600% bilayer achieved. This realised custom-designed substrates near-zero reflectance near the normal incidence. In particular, by using an aperture...