We present gradient-index optical coating technology and show that anti-reflective coatings with extremely low reflectance (< 0.2%) over wide bandwidth (400-1050 nm) can be deposited at low-temperature (≤ 100°C) with a total coating thickness of < 150 nm in large-scale (> 6 m2) batch configuration. In addition, we demonstrate that this optical performance can be maintained at angles of incidence up to 50°, a performance that cannot be matched with traditional optical coatings utilized in the optics industry.
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