Absorption-Modulated Crossed-Optical Fiber-Sensor Platform for Measurements in Liquid Environments and Flow Streams

Figure 5

Illustration of the evanescent wave generated at the boundary of the fiber core and the effect of mode depletion of high-order modes by an absorbing sample. (a) Linear response obtained when light is equally absorbed by all modes. (b) Nonlinear response obtained when high-order modes are depleted.

(a)

(b)