Abstract
Chromatic aberration-free meta-devices (e.g., achromatic meta-devices and abnormal chromatic meta-devices) play an essential role in modern science and technology. However, current efforts suffer the issues of low efficiency, narrow operating band, and limited wavefront manipulation capability. We propose a general strategy to design chromatic aberration-free meta-devices with high-efficiency and ultrabroadband properties, which is realized by satisfying the key criteria of desirable phase dispersion and high reflection amplitudes at the target frequency interval. The phase dispersion is tuned successfully based on a multiresonant Lorentz model, and high reflection is guaranteed by the presence of the metallic ground. As proof of the concept, two microwave meta-devices are designed, fabricated, and experimentally characterized. An achromatic meta-mirror is proposed within 8 to 12 GHz, and another abnormal chromatic meta-mirror can tune the reflection angle as a linear function. Both meta-mirrors exhibit very high efficiencies (85% to 94% in the frequency band). Our findings open a door to realize chromatic aberration-free meta-devices with high efficiency and wideband properties and stimulate the realizations of chromatic aberration-free meta-devices with other functionalities or working at higher frequency.
Highlights
The manipulation of electromagnetic (EM) waves with highefficiency and wideband is of great importance to increase the accuracy and efficiency of integrated optics components, especially for chromatic aberration-free meta-devices
The reported achromatic meta-devices are limited by low efficiencies and/or narrow bandwidth
Some achromatic meta-lenses are engineered at only three separate frequencies,[17,18] and the dispersion cannot be tuned within a wide band
Summary
The manipulation of electromagnetic (EM) waves with highefficiency and wideband is of great importance to increase the accuracy and efficiency of integrated optics components, especially for chromatic aberration-free meta-devices (e.g., achromatic meta-devices and abnormal chromatic meta-devices). Cai et al.: Ultrawideband chromatic aberration-free meta-mirrors to visible, have found a wide scope of applications in EM integration, optical imaging, target detection, as well as communication systems.[9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54]. To realize a chromatic aberration-free meta-device with high efficiency and ultrawideband properties, it is necessary to manipulate both the phase dispersion and reflection or transmission property at will
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
