Figure 2
From: All-optical tunable buffering with coupled ultra-high Q whispering gallery mode microcavities
Preparing coupled silica toroid microcavities. (a) Characterization of fabricated samples. The left picture is a microscope image of C1 and C2. The top and bottom graphs represent the transmission spectra of optical modes in C2 and C1, respectively. The blue and red lines are the transmission spectra of the signal (M1 and M2) and control (M3) modes. The insets in the graphs are enlargements of the transmission spectra. (b,c) The transmission spectra of coupled M1 and M2 for different (b) temperatures of C1 and (c) different gaps between C1 and C2, respectively. The blue solid and red dashed lines represent the measured and fitted data, respectively. The frequency mismatch between M1 and M2 (δf) and the coupling rate between M1 and M2 (κ/2π) were estimated from the fitted data.
