Quantifying metarefraction with confocal lenslet arrays |
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Authors: | Tautvydas Maceina Johannes Courtial |
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Institution: | a Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gos?tauto 12, LT-01108 Vilnius, Lithuaniab School of Physics & Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom |
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Abstract: | METATOYs can change the direction of light in ways that appear to, but do not actually, contravene the laws of wave optics. This direction change applies only to part of the transmitted light beam; the remainder gets re-directed differently. For a specific example, namely confocal pairs of rectangular lenslet arrays with no dead area between lenslets, we calculate here the fractions of power of a uniform-intensity light beam incident from a specific (but arbitrary) direction that get re-directed in different ways, and we derive an equation describing this redirection. This will facilitate assessment of the suitability of METATOYs for applications such as solar concentration. Finally, we discuss similarities between the multiple refraction of light at the lenslet arrays and multiple refraction and reflection of cold atoms at a barrier in the presence of the light fields. |
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Keywords: | Confocal lenslet arrays METATOYs Field of view Geometrical optics Optical materials |
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