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Schematic drawing of the VCSEL sensor with the swelling polymer (inverted cross-hatch) of optical thickness plus increment , top and bottom mirror (horizontal hatch), electrical contacts (vertical hatch), pn-junction active medium (cross-hatch), and electrical insulator (solid).
Plot of the detected optical power of the coated VCSEL (solid line, left axis), reference VCSEL (dotted line), and the acetone concentration (dashed line, right axis) versus time. The laser drive current is I = 1.25 mA or .
Plot of the coated VCSELs differential quantum efficiency, (solid line, left axis) and threshold current (dashed line, right axis) versus time.
Laser parameters used in the simulation.
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