Figure 5: Refractive index sensing.
From: All-dielectric metasurface analogue of electromagnetically induced transparency
(a) SEM image of the sample with the quartz substrate etched by 100 nm. (b) Measured transmittance spectra of the EIT metasurface when immersed in oil with refractive index ranging from 1.40 to 1.44. (c) The red circles show the experimentally measured resonance peak position as a function of the background refractive index. The blue curve is a linear fit to the measured data, which was used to determine the sensitivity as 289 nm RIU−1.
