Abstract
A unified Brewster effect condition is proposed as a guideline for the design of the reflectionless lens. Previously, most of the investigations on the Brewster effect are limited for the homogeneous isotropic medium and the condition is sensitive to the polarization states. Here, it is predicted both theoretically and numerically that an arbitrarily polarized electromagnetic wave can perfectly refract through an anisotropic plate. In particular, both TE- and TM-polarized incident waves can have an identical Brewster angle with total transmission at either normal or oblique incidence by adjusting the material anisotropy. As a proof of concept, we employ this unified theory into the design of a 2-D reflectionless lens with a simplified restriction condition. It is demonstrated that perfect wavefront shaping with no fundamental limits on its efficiency is obtained with the proposed topology. To illustrate practically the concept of Brewster lens, a three-layer cascaded lens is fabricated and measured with a thickness of 0.1λ and an aperture efficiency of 94.3%. A remarkable 10.3 dB gain increasement is obtained compared with its counterparts.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.