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John A. Polo Jr

Publications and source records attributed to John A. Polo Jr.

4 recordsLinked to original sources
arXiv2007

Engineering the phase speed of surface-plasmon wave at the planar interface of a metal and a chiral sculptured thin film

The solution of a boundary-value problem formulated for a modified Kretschmann configuration shows that the phase speed of a surface-plasmon wave guided by the planar interface of a sufficiently thin metal film and a chiral sculptured thin film (STF) depends on the vapor incidence angle used while fabricating the chiral STF by physical vapor depoistion. Therefore, it may be possible to engineer the phase speed quite simply by selecting an appropriate value of the vapor deposition angle (in addition to the metal and the evaporant species).

physics.optics↗
arXiv2007

Morphological effects on surface plasmon polaritons at the planar interface of a metal and a columnar thin film The Planar Interface Of A Metal And A Columnar Thin Film

Surface plasmon polaritons (SPPs) at the interface of a columnar thin film (CTF) and metal exist over a range of propagation directions relative to the morphology of the CTF which depends on the tilt of the columns in the CTF. The phase speed of the SPP wave varies mainly as a function of the tilt of the CTF columns. Both the confinement of the SPP wave to the interface and the decay of the SPP wave along the direction of propagation depend strongly on the direction of propagation relative to the morphologically significant plane of the CTF. The greater the columnar tilt in relation to the interface, the shorter is the range of propagation. Because of its porosity and the ability to engineer this biaxial dielectric material, the CTF-metal interface may be more attractive than traditional methods of producing SPPs.

physics.optics↗
arXiv2007

Dyakonov-Tamm wave at the planar interface of a chiral sculptured thin film and an isotropic dielectric material

Surface waves, named here as Dyakonov-Tamm waves, can exist at the planar interface of an isotropic dielectric material and a chiral sculptured thin film (STF). Due to the periodic nonhomogeneity of a chiral STF, the range of the refractive index of the isotropic material is smaller but the range of the propagation direction in the interface plane is much larger, in comparison to those for the existence of Dyakonov waves at the planar interface of an isotropic dielectric material and a columnar thin film.

physics.optics↗