The holes of a photonic-crystal fiber can be filled with optically nonlinear fluids in an arbitrary pattern, leading to versatile devices with properties such as soliton propagation and supercontinuum generation. The concept of filling the holes in a photonic-crystal fiber (PCF) to modify the fiber's properties has gained a tremendous amount of interest in different optical fields. It is possible to use gases, metals, and liquids as filler materials. In nonlinear optics, liquids are most interesting because of their potential to generate high optical nonlinearities due to their large nonlinear coefficients. It is highly desirable to combine the structure of a PCF with the nonlinear optical properties of a liquid to gain complete control over dispersion and high nonlinearity simultaneously.
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