This paper presents a study of the influence of bimetallic layer covers of a tapered optical
fiber surrounded by a low refractive index liquid crystal on the properties of light propagation
in the taper structure. This research follows previous works on the effect of monometallic thin
films (Au and Ag). In this case, the total thicknesses of the bimetallic layers were h= 10 nm,
and the participation of gold and silver was equal. The films were deposited on one side of
the tapered waist area. The liquid crystal cells were controlled with a voltage U from 0 to 200 …

Tapered optical fibers, due to their specific optical properties, are great sensing elements.
During the elongation of an optical fiber, a tapered waist forms, which allows the
electromagnetic wave to propagate in the whole volume of this structure; simultaneously,
some part of this wave leaks out of the taper as an evanescent wave. In fiber-based surface
plasmon resonance sensors, the evanescent field of propagating modes in a fiber
penetrates a thin metal layer and, thus, the surface plasmons are excited at a metal/dielectric …