Broadband, millimeter-wave anti-reflective structures on sapphire ablated with femto-second laser
R. Takaku,
S. Hanany,
H. Imada
et al.
Abstract:We designed, fabricated, and measured anti-reflection coating (ARC) on sapphire that has 116% fractional bandwidth and transmission of at least 97% in the millimeter wave band. The ARC was based on patterning pyramid-like subwavelength structures (SWS) using ablation with a 15 W femto-second laser operating at 1030 nm. One side of each of two discs was fabricated with SWS that had a pitch of 0.54 mm and height of 2 mm. The average ablation volume removal rate was 1.6 mm 3 /min. Measurements of the two-disc san… Show more
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