Optical computing has been pursued for decades as a potential strategy advancing beyond the fundamental performance limitations of semiconductor-based electronic devices, but feasible on-chip integrated logic units and cascade devices have not reported. Here we demonstrate that plasmonic binary NOR gate, 'universal gate', can be realized through cascaded OR NOT gates in four-terminal nanowire networks. This finding provides path development novel nanophotonic processor architectures future...

Noble metal nanostructures are able to concentrate light into small volumes, which enhances greatly the local electromagnetic (EM) field near nanostructures. The areas with enhanced EM become “hot spots” for surface-enhanced Raman spectroscopy (SERS), utilizes enhancement properties of amplify usually weak scattering signals. preparation superior SERS performances is one main topics in and important applications sensing analysis. In this feature article, we review several different kinds...

We show that the local electric field distribution of propagating plasmons along silver nanowires can be imaged by coating with a layer quantum dots, held off surface nanowire nanoscale dielectric spacer layer. In simple networks two optical inputs, control polarization and phase input fields directs guided waves to specific output. The QD-luminescent images these structures reveal complete family phase-dependent, interferometric logic functions performed on networks. These results potential...

Chiral surface plasmon polaritons (SPPs) can be generated by linearly polarized light incident at the end of a nanowire, exciting coherent superposition three specific nanowire waveguide modes. Images chiral SPPs on individual nanowires obtained from quantum dot fluorescence excited SPP evanescent field reveal chirality predicted in our theoretical model. The handedness and spatial extent helical periods depend input polarization angle diameter as well dielectric environment. Chirality is...

We study the polarization dependence of surface-enhanced Raman scattering (SERS) in coupled gold nanoparticle-nanowire systems. The coupling between continuous nanowire plasmons and localized nanoparticle results significant field enhancements SERS comparable to those found dimer junctions. intensity is maximal when incident light polarized across particle wire, enhancement remarkably insensitive detailed geometrical structures nanoparticles.

Using propagating plasmons on silver nanowires as an excitation source we perform surface-enhanced Raman scattering (SERS) at a nanoparticle/wire junction located remotely from the laser illumination spot with sensitivities in few molecules range. Simultaneous multisite remote-excitation SERS sensing can also be achieved.

In this Letter we provide experimental verification of the interparticle distance dependence SERS enhancement factor in 1 μm gold gapped nanorods. Au dimers are fabricated from electrochemically grown heterogeneous Au-Ag-Au nanorods and deposited on a stretchable elastomer film which allows active reversible tuning gap sub-5-nm level. Significantly, technique to be tracked using single dimer, thereby avoiding reproducibility issues arising morphological differences disparate nanoparticle pairs.

We investigate the interaction between propagating surface plasmons in silver nanowires and excitons generated quantum dots. show can excite excitons, which results dot emission. In this process, energy is directly transferred from to without converting photons. Furthermore, we demonstrate reverse process where decay of generates plasmons.

We study the optical excitation of high-order surface plasmon resonance modes in individual Ag nanorice particles using dark-field scattering spectroscopy. analyze results by model calculations boundary element method. Symmetry breaking caused oblique illumination makes even order observable spectrum. All peaks are found to redshift with increasing length particle.

We describe a new route, in which the polyethylene glycol (PEG) is used both as solvent and reducing reagent polymer polyvinglpyrrolidone (PVP) capping agent, for synthesis of monodisperse silver nanoparticles. Uniform nanospheres with an average diameter 54 nm can be routinely synthesized high yield through this approach by using PVP/AgNO3 molar ratio 8 at 260 °C. Both reaction temperature are crucial diameters size distributions nanospheres.

Surface plasmons, the quanta of collective oscillations free electrons at metal surface, can be easily tuned by changing surrounding dielectric materials, which is well known for nanoparticles and surfaces, but less one-dimensional nanowires. Here, we find an extremely large tunability surface plasmons on Ag nanowires with a beat period near-field distribution pattern increasing 90 nm per nanometer Al 2 O 3 coating, or 16 µm refractive index unit change in medium. Such high sensitivity...

Abstract The fast development of plasmonics have greatly advanced our understanding to the abundant phenomena related surface plamon polaritons (SPPs) and improved ability manipulate light at nanometer scale. With tightly confined local field, SPPs can be transmitted in waveguides subwavelength dimensions. Nanophotonic circuits built with plasmonic elements scaled down dimensions compatible semiconductor-based nanoelectronic circuits, which provides a potential solution for next-generation...

The coupling between the spin and orbital degrees of freedom photons is usually very weak, but recent studies have shown that this spin-orbit interaction (SOI) can be easily detected in metal structures. Here we show how SOI light enhanced plasmonic nanostructures, explore underlying mechanism for effect, further demonstrate it could potentially harnessed nanophotonic applications. Specifically, scattering circularly polarized by a single nanosphere causes to propagate along sharply twisted...

Optical interferometric logic gates in metal slot waveguide network are designed and investigated by electromagnetic simulations. The can realize all fundamental operations. A single Y-shaped junction work as gate for four functions: AND, NOT, OR XOR. By cascading two junctions, NAND, NOR XNOR be realized. working principle is analyzed detail. In the simulations, these show large intensity contrast Boolean states of output. These results useful future integrated optical computing.

Abstract The extraordinary optical properties of surface plasmons in metal nanostructures provide the possibilities to enhance and accelerate spontaneous emission, manipulate decay emission processes quantum emitters. extremely small mode volume plasmonic nanocavities also benefits realization plasmon–exciton strong coupling. Here, progress on study plasmon modified coupling are reviewed. fundamentals emitters, methods for assembling systems emitters first introduced. Then major aspects...

The strong coupling between excitons and single plasmonic nanocavities enables plexcitonic states in nanoscale systems at room temperature. Here we demonstrate the of surface plasmon modes metal nanowires monolayer semiconductors, with Rabi splitting manifested both scattering photoluminescence (PL) spectra. By utilizing propagation properties plasmons on nanowires, PL emitted through plasmon-exciton hybrid is extracted. analytically calculated spectra well reproduce experimental results....

Single-molecule surface-enhanced Raman spectroscopy (SM-SERS) holds great potential to revolutionize ultratrace quantitative analysis. However, achieving SM-SERS is challenging because of strong intensity fluctuation and blinking characteristics. In this study, we reveal the relation P = 1 – e–α between statistical SERS probability microscopic average molecule number α in spectra, which lays physical foundation for a route implement quantitation. Utilizing calibration, achieve analysis with...

SERS-active silver hierarchical assemblies are synthesized in solution by the assistance of small acid molecules. We here demonstrate acid-directed self-assembly metal nanoparticles (MNPs) into large systems with complex structures, without application any polymer surfactant or capping agent. It is verified that molecules (citric acid, mandelic etc.) incorporated conventional chemistry can direct assembly MNPs well-defined structures. The constructed assembled structures highly roughened...

Plasmonics is a rapidly developing research field with many potential applications in fields ranging from bioscience, information processing and communication to quantum optics. It based on the generation, manipulation transfer of surface plasmons (SPs) that have ability manipulate light at nanoscale. Realizing plasmonic requires understanding how SP-based properties depend nanostructures these can be controlled. For purpose composite are particularly interesting because novel extraordinary...

Surface plasmons, the collective oscillations of electrons at metal surface, provide ability to enhance weak interaction between individual quantum emitters and photons for information applications. The generation single plasmons by coupling silver nanowire with opens prospects using optical techniques control surface designing novel plasmonic devices. However, real applications will deal multiple generated from emitters. Here we report first experimental demonstration resolving a pair dots...

Holed up: Individual nanometer hole–particle pairs are prepared by self-assembly and their optical properties studied. A single nanoparticle is located in a nanohole, which creates hot sites between them, thus greatly enhancing Raman signals of probe molecules. The enhancement shown to depend on the spacing particle hole. This new system has great potential for SERS studies general biosensor applications particular.

Nanoplasmonic devices are promising for next generation information and communication technologies because of their capability to confine light at subwavelength scale transport signals with ultrahigh speeds. However, ohmic losses inherent all plasmonic so that further development integrated plasmonics requires efficient in situ loss compensation a wavelength polarization choice. Here we show CdSe nanobelt/Al2O3/Ag hybrid waveguides allow broadband propagating different polarizations using an...

Plasmonics is a rapidly developing field concerning light manipulation at the nanoscale with many potential applications, of which plasmonic circuits are promising for future information technology. Plasmonic waveguides fundamental elements constructing integrated circuits. Among proposed different waveguides, metallic nanowires have drawn much attention due to highly confined electromagnetic waves and relatively low propagation loss. Here we review recent research progress in waveguiding...