Figure 3.
Flow chart of ray tracing simulations. n: Refractive index. nfluid: Refractive index of the fluid within the MC (taken as 1.358, the refractive index of ethanol at 1,550 nm wavelength and in room temperature). ϕ: Angle between the direction of propagation of a ray and the fiber axis. θ: Angle of incidence between the direction of propagation of a ray, and the normal to the boundary between fluid and air. θc: Minimum angle of incidence for which total internal reflection takes place at the boundary between fluid and air.