Figure 1: Design of light focussing and interference in an optofluidic waveguide.
From: Optofluidic waveguide as a transformation optics device for lightwave bending and manipulation
(a) Schematic illustration of the optofluidic waveguide with three laminar flows in the microchannel (the surrounding PDMS structures are not shown). The white arrow represents the flow direction. (b) GRIN profile of the microchannel in the transverse direction used to achieve light focussing. (c) Bidirectional GRIN profile used to achieve light interference. The intensity scale shows the refractive index distribution. (d) Simulated light propagation in the waveguide for the index profile shown in (b), where n(0)=1.432, nc=1.332. Light is bent and periodically focussed in the optofluidic waveguide. The horizontal dashed lines represent the boundaries between the waveguide core and claddings. The vertical solid line represents the wavefront. (e) Simulated light propagation in the waveguide with the index profile shown in (c), where r=1/3 and Qclad=0.5 μl min−1. Light interference is clearly shown in the optofluidic waveguide. For (d) and (e), scale bar equals 100 μm and the vertical direction is magnified by two.
