We show experimentally that diffraction-induced surface plasmon excitation can mimic enhanced transmission and cause a highly sensitive modulation by the coherent interference between zero-order and reflected first-order diffraction in select regions of the terahertz spectrum. Based on the study of a one-dimensional metallic grating, we obtain the physical mechanisms of the fractional-order sur...

We present a basic theory on Airy surface magneto plasmons (SMPs) at the interface between a dielectric layer and a metal layer (or a doped semiconductor layer) under an external static magnetic field in the Voigt configuration. It is shown that, in the paraxial approximation, the Airy SMPs can propagate along the surface without violating the nondiffracting characteristics, while the ballistic...

We propose a scheme for coupling laser light into graphene plasmons with the help of electrically generated surface acoustic waves. The surface acoustic wave forms a diffraction grating which allows us to excite the long lived phononlike branch of the hybridized graphene plasmon-phonon dispersion with infrared laser light. Our approach avoids patterning the graphene sheet, does not rely on comp...

Plasmon resonances (PRs) in metallic nanostructures have been extensively studied, whereas reports on PR silicon nanowires (Si NWs) are very few, partial, and they refer to structures larger than 100 nm. Discrete Si NWs with core sizes as small 30 nm at high resolution observed. They attributed plasmonic identifying two groups, the traveling waves, exhibiting discrete modes along NW length for ...

Recently, a new branch of quantum optics—quantum nanoplasmonics—has arisen.1,2 Advantageous plasmon properties such as small wavelength and a high-energy concentration open new perspectives for constructing nanodevices such as waveguides, cavities, and antennas. In this regard, studies of plasmons propagating along 1D objects such as wires,3 wedges,4,5 and channels6,7 are of great interest. Los...

The spontaneous emission (SE) of quantum dot (QD) excitons into surface plasmons in a cylindrical nanowire is investigated theoretically. Maxwell's equations with appropriate boundary conditions are solved numerically to obtain the dispersion relations of surface plasmons. The SE rate of QD excitons is found to be greatly enhanced at certain values of the exciton bandgap. Application in generat...

Excitation of surface plasmons in a single silver nanowire using higher-order-mode light shows that nanowire waveguide has no request on the spatial mode of the input light, which is determined by its orbital angular momentums (OAM) in the experiment. The excitation efficiency can be controlled by adjusting the light polarization. Experimental result also indicates that the propagating modes of...

A form of optical modulation at low pulse rates is reported in the case of surface plasmons excited by 1.55-mm photons in a thin gold foil. Several visible-photon energies are shown to be pulsed by the action of the infrared pulses, the effect being maximized when each visible beam also excites surface plasmons. The infrared surface plasmons are implicated as the primary cause of thermally indu...