Abstract
AN experimental study of the metallic delay lens described by Kock1 has been made in this Establishment, using a lens constructed of parallel strips as in Fig. 1, the E vector being normal to the line of the strips. The dimensions were such that Kock's formula for refractive index where s is width of strips and N is number of strips per unit area viewed end on, gave the value 1·41 for n. The predicted cut-off wave-length was 1·8 cm.
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References
Kock, W. E., Bell System Tech. J., 58 (January 1948).
Macfarlane, G. G., J. Inst. Elect. Eng., 93, Pt. III A, 703 (1946).
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JONES, S., BROWN, J. Metallic Delay Lenses. Nature 163, 324–325 (1949). https://doi.org/10.1038/163324a0
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DOI: https://doi.org/10.1038/163324a0
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