Universal impedance matching and the perfect transmission of white light

Ku Im, Ji Hun Kang, Q. Han Park

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


Light is reflected at the interface between heterogeneous media due to the mismatch of impedance 1-3 . Removing this mismatch using additional materials, a technique known as anti-reflection, has so far been restricted to specific frequencies and incidence angles 3-7 . 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.

Original languageEnglish
Pages (from-to)143-149
Number of pages7
JournalNature Photonics
Issue number3
Publication statusPublished - 2018 Mar 1

Bibliographical note

Funding Information:
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.

Publisher Copyright:
© 2018 The Author(s).

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Universal impedance matching and the perfect transmission of white light'. Together they form a unique fingerprint.

Cite this