The transient nature of the fluid-fluid interface leads to additional design rules for photonic components built on the microfluidics platform. The properties and function of such optical components can be adjusted in real time. We demonstrated application of liquid-core liquid-cladding (L{sup}2) waveguides in several dynamic photonic systems (Figure 1). These optical components could be reconfigured in terms of their geometry, refractive index, or chemical composition.
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