Figure 9
From: Optofluidic vapor sensing with free-space coupled 2D photonic crystal slabs

Measured sensor response times with different polymer coating thicknesses: (a) Hexane vapor with concentrations of 1.09 × 103 ppm and 4.34 × 103 ppm; and (b) Ethanol vapor with concentrations of 2.93 × 103 ppm and 1.17 × 104 ppm.