Retraction of: Scientific Reports, published online 24 January 2019

The authors are retracting this Article.

We were alerted to the possibility that our designed structure is a broadband cross-polarization metamaterial converter, rather than a broadband metamaterial absorber.

We have now performed additional simulations and calculations, confirming that we did not account for cross-polarized reflection in the absorption calculation.

As such, we are unable to support the conclusions regarding design of a broadband metamaterial absorber, because the designed structure exhibits broadband cross-polarization.

All authors agree to the retraction of the Article.