Kavli Affiliate: Tomotake Matsumura
| First 5 Authors: Shaul Hanany, Scott Cray, Samuel Dietterich, Jan Dusing, Calvin Firth
| Summary:
We used laser ablation to fabricate sub-wavelength structure anti-reflection
coating (SWS-ARC) on a 5 cm diameter alumina lens. With an aspect ratio of 2.5,
the SWS-ARC are designed to give a broad-band low reflectance response between
110 and 290 GHz. SWS shape measurements conducted on both sides of the lens
give 303 $mu$m pitch and total height between 750 and 790 $mu$m, matching or
exceeding the aspect ratio design values. Millimeter-wave transmittance
measurements in a band between 140 and 260 GHz show the increase in
transmittance expected with the ARC when compared to finite element analysis
electromagnetic simulations. To our knowledge, this is the first demonstration
of SWS-ARC on an alumina lens, opening the path for implementing the technique
for larger diameter lenses.
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