Relief gratings and microlenses fabricated with silicone.
Divergent microlenses and low-spatial-frequency interference gratings have been fabricated in low-cost silicone layers. The size of the microlenses ranges from approximately 1 mm to 100 microm while spatial frequencies of interference gratings range from 4 to 18 l/mm. The fabrication method involves the recording of spatial distributions of mid-IR light. At recording time silicone layers are in a gel state. Then layers are cured by heat. The final silicone layers are transparent and rigid.
Centro de Investigaciones en Optica A.C., Loma del Bosque 115, Leon, Guanajuato, Codigo Postal 37150, Mexico. scalixto@foton.cio.mx
Sergio
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Calixto