Pushing the Limits of Broadband and High-Frequency Metamaterial Silicon Antireflection Coatings

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...

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Veröffentlicht in:Journal of low temperature physics 2018-12, Vol.193 (5-6), p.876-885
Hauptverfasser: Coughlin, K. P., McMahon, J. J., Crowley, K. T., Koopman, B. J., Miller, K. H., Simon, S. M., Wollack, E. J.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-018-1955-7