Fig. 3: Simulation of the nested capillary coupling.
From: Microfluidic flowmeter based on a liquid crystal-filled nested capillary

a Schematic diagram of the nested cylindrical resonator and coupling fiber, simulated electric field intensity distributions in (b) single cylindrical resonator and c nested cylindrical resonator structure, d simulated transmission spectra for the single cylindrical and the nested cylindrical resonators as well as the zoomed graph in a wavelength range from 1540 to 1545 nm, e selected transmission dip shift as a function of the liquid crystal RI. (WGM: whispering gallery mode).