Light is reflected at the interface between heterogeneous media due to the mismatch of impedance1,2,3. Removing this mismatch using additional materials, a technique known as anti-reflection, has so far been restricted to specific frequencies and incidence angles3,4,5,6,7. The anti-reflection of white light, which requires the simultaneous matching of impedance over extremely wide angular and spectral ranges, has until now been considered impossible. Here, we develop a theory of universal impedance matching and introduce a matching layer that enables the perfect transmission of white light. The ability of a matching layer to assist in omnidirectional and frequency-independent anti-reflection has been confirmed analytically and numerically. We explain the feasibility of a universal matching layer using metamaterials, and demonstrate a transmission rate of over 99% for white light in the visible range with a double-layered dielectric metamaterial. This is confirmed experimentally by demonstrating the omnidirectional anti-reflection of microwaves in heterogeneous media.
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This work was supported by the Samsung Science and Technology Foundation under project no. SSTF- BA1401-05. Q.-H.P. thanks Y. Kivshar and W. Choi for comments and encouragement.
The authors declare no competing financial interests.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary discussion, conditions and derivations; Supplementary Figures 1–6; Supplementary References 1–9.
Propagation of an optical pulse, moving to the right, incident onto a quarter-wave anti-reflection layer.
Propagation of an optical pulse, moving to the right, incident onto a universal impedance matching layer.
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Im, K., Kang, J. & Park, Q. Universal impedance matching and the perfect transmission of white light. Nature Photon 12, 143–149 (2018). https://doi.org/10.1038/s41566-018-0098-3
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