Experimental and numerical study of highly sensitive displacement sensors based on photonic crystals at microwave band

Abstract

Structures composed of two photonic crystal slabs are fabricated, measured, and simulated around 13.5 GHz. Experimental and simulated results are in good agreement. The transmission spectrum is highly sensitive to the distance between the two slabs, which demonstrates that the structures under investigation can be used to achieve displacement sensors.

Spectral characteristics of coupled gratings at PT-symmetry and its destruction

“…In spite of a significant number of publications devoted to such structures, the attention of the international scientific community has been mainly focused on setting the properties of the structure during its design or on the mechanical control of its properties (by mutual displacement of the two lattices) [12][13][14][15][16][17][18][19]. At the same time, research on this topic has neglected the prospects of using active elements in such structures.…”

Bound States in the Continuum in double layer structures

“…One interesting question thus is to conveniently generate BICs for any nonzero incident angles. Here, we consider a mechanically tunable double layer structure consisting of coupled PhC slabs 25 26 27 28 , which keeps the geometric symmetry and has a controllable spacing between two slabs, as shown in Fig. 2(a) .…”