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Normalized transmission spectra of (a) strip- and (b) slot-waveguide ring resonators for TE-polarization with no deposited liquid (red thin solid line) and 24 h (black thick solid line) and 96 h (blue dashed line) after the evaporation of an isopropanol droplet.
Laser scanning confocal microscope images and intensity profiles of the slot-waveguide ring resonator before isopropanol droplet deposition (solid line) and after isopropanol droplet evaporation (dashed line). Profiles are along the dotted lines illustrated in the top-view confocal microscope images shown in the left and right insets, respectively.
Schematic cross sections of simulated (a) strip- and (b) slot-waveguides covered with liquid layers. Propagation is along the -axis and both waveguides turn to the left (-axis) with a radius of curvature of .
Normalized transmission spectra of the strip-waveguide microring resonator for TE-polarization 24 h after the evaporation of isopropanol (black thick solid line), cyclohexane (red dashed line), and hexane (blue thin solid line) droplets.
Main parameters of strip- and slot-waveguide ring resonators before isopropanol deposition (unwet) and 24 h after droplet evaporation. is the loaded quality factor (, with wavelength and ), ER is the extinction ratio (ratio of power transmitted at nonresonant and resonant wavelengths), and is the group index [, where is the free-spectral range].
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