Sculptured nematic thin films with periodically modulated tilt angle as rugate filters

Multiple trains of same-color surface plasmon-polaritons guided by the planar interface of a metal and a sculptured nematic thin film

“…Physical vapor deposition has been used to grow the thin film, and the relative permittivity profile is sculptured by effectively varying the vapor incident angle sinusoidally about a mean value [21]. The characteristic of the structure has been implemented to design and fabricate rugate filters [24]. It has been documented that multiple SPP waves with the same frequency but different phase speed, attenuation rates, and spatial field profiles can be guided by metal/SNTF interface in the prismcoupled and grating coupled configurations [19,21,[25][26][27].…”

Sculptured—thin—film plasmonic—polaritonics

“…The procedure to obtain the 4×4 matrix [M stf ] can be gleaned from two predecessor papers [24], [25]. The remaining two 4×4 matrixes in Eq.…”

Multiple plasmonic modes with sculptured thin films

“…9 We examined two types of STFs for exciting SPP waves: sculptured nematic thin films (SNTFs) and chiral STFs. SNTFs are produced by rocking the substrate to produce slanted wavy nanocolumns with essentially 2D morphology, 10 while chiral STFs are produced by rotating the substrate about its normal to produce helical nanocolumns 11,12 with 3D morphology. In addition to functioning simply as the dielectric side of the interface along which the SPP travels, an STF may have an advantage over dense dielectric materials in certain applications because of its tailorable porosity.…”