Propagation Characteristics Of Surface Plasmons Research Articles

Long-range surface plasmons supported by the disordered nanowire metamaterials

Considering the losses of metal and semiconductor and by obtaining exact dispersion relations of the modes, we theoretically study the propagation characteristics of surface plasmons supported by disordered nanowire metamaterials. The metamaterials are composed of disordered nanowires made of metal or semiconductor embedded into the dielectric material. In the case of the semiconductor nanowires, it is possible to considerably improve the propagation characteristics of surface plasmons supported by the system, as compared to the metallic nanowires.

Calculation of propagation characteristics of surface plasmons in gold/silver nanowires

We obtain the propagation characteristics of the fundamental plasmon mode guided along Au and Ag nanowires using a simple and accurate method proposed recently by our group for solving the complex eigenvalue equations. Our results are found in excellent agreement with the ones obtained by the finite element method. Furthermore, results obtained using Johnson and Christy’s data [Phys. Rev. B6, 4370 (1972)PLRBAQ0556-2805] for Au and Ag are found in excellent agreement with the recently reported experimental results. On the other hand, Palik’s data [Handbook of Optical Constant of Solids (Academic, 1985)] are found to highly overestimate the losses in Ag nanowires. This study establishes a simple and accurate method for theoretical modeling of surface plasmons guided along Au and Ag nanowires for their applications in various plasmonic devices.

Design of Surface Plasmon Polariton Sensor Design by Grating Structure

Surface plasmon polariton (SPP) waves exhibit local characteristics that can break diffraction limits; for this reason, the production of subwavelength optoelectronic device has been the focus of current studies. To determine the importance of surface plasmon wave applications, we aim to investigate whether or not the theoretical dispersion obtained in the plasma and metal (Drude model) exhibits the same expression, satisfy the relationship of SPPs by controlling the electron density of the plasma and the frequency of the incident electromagnetic wave, and derive the system performance parameters and plasma density parameters by changing the grating geometry and dielectric constant of the surrounding medium by using the grating structure based on surface plasmon propagation characteristics associated with sensor research. The simulation results of then design structure showed that transmission bandwidth rapidly decreases and transmission peak gradually decreases as metal dielectric thickness decreases. An SPP sensor can effectively eliminate light instability in the two wavelengths of light intensity difference to obtain anti-interference and improve the range of the measuring instrument by using two fiber-grating structure filters. Therefore, studies on surface plasmon devices for integrated application are of promotional importance.

Chemical and Dielectric Manipulation of the Plasmonic Band Gap of Metallodielectric Arrays

The propagation characteristics of surface plasmons (SPs) on metallodielectric 1-D arrays are studied as a function of dielectric environment. Metallodielectric gratings are immersed in solvent media and, alternatively, functionalized with alkanethiol self-assembled monolayers (SAMs). While the two approaches induce shifts of the SP to lower energies and reduce the group velocity, the plasmonic band gap decreases with increasing refractive index but increases with SAM functionalization. This is the first reported study of chemically controlled manipulation of a plasmonic band gap.