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An electrical-optical chip input-output (I/O) interconnection technology called sea of polymer pillars (SoPP) is presented. SoPP provides highly process-integrated and mechanically flexible (compliant) electrical-optical die-to-board interconnections that mitigate thermo-mechanical expansion mismatches. The I/O density of SoPP exceeds 105/cm2. The compliance of the polymer pillars is shown to be 3-5 μm/mN. Approximately 50% input optical coupling efficiency into a volume grating coupler through a set of polymer pillars is demonstrated.