Optical transmission of polymer pillars for chip I/O optical interconnections

In the pursuit of high-density wafer-level input-output optical interconnections, microscopic polymer pillars have recently been fabricated. The optical performance of these pillars is critical for their potential application to gigascale integration. In the present work, the optical transmission of these pillars is analyzed and measured. It is shown that these polymer pillars act as precision many-moded waveguides, thus, verifying the cross-sectional uniformity, smoothness of surfaces, and optical quality of the material.