Abstract
Broadband refractive optics realized from high-index materials provide compelling design solutions for the next generation of observatories for the cosmic microwave background and for sub-millimeter astronomy. In this paper, work is presented which extends the state of the art in silicon lenses with metamaterial antireflection coatings toward larger-bandwidth and higher-frequency operation. Examples presented include octave bandwidth coatings with less than \(0.5\%\) reflection, a prototype 4:1 bandwidth coating, and a coating optimized for 1.4 THz. For these coatings, the detailed design, fabrication and testing processes are described as well as the inherent performance trade-offs.
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Acknowledgements
This work was supported by a NASA Office of the Chief Technologists Space Technology Research Fellowship # NNX15AP46H. McMahon Lab efforts were supported by NNX13AE56G, NNX14AB58G and DE-SC0015799.
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Coughlin, K.P., McMahon, J.J., Crowley, K.T. et al. Pushing the Limits of Broadband and High-Frequency Metamaterial Silicon Antireflection Coatings. J Low Temp Phys 193, 876–885 (2018). https://doi.org/10.1007/s10909-018-1955-7
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DOI: https://doi.org/10.1007/s10909-018-1955-7