Abstract
Ultrafast laser micro-fabrication has found a wide range of applications in the past decades. In particular, it is possible to create advanced photonics chips based on three-dimensional optical waveguides. Significant potential has been demonstrated in areas such as topological photonics[1] and quantum technologies[2]. Traditional fabrication methods create optical waveguides by focusing ultrafast laser into transparent materials, such as fused silica or borosilicate glass, producing localized refractive index modification. Here, we demonstrate that our recently reported Spherical Phase Induced Multi-Core Waveguides (SPIM-WGs)[3] overcome some constraints of traditional waveguide fabrication techniques, enabling new functionalities in quantum applications.
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