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Bottom part. It was replicated from a NOA master mold (Norland Optical Adhesive 81) onto a 245 µm COC substrate (Topas®, 8007) using a dry film laminator (RLM 419p) at 140 °C with a speed of 0.2 mm/min and a load of 4.5 kg pressure. NOA master mold was fabricated from sa...