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Abstract
This is a reply to the comment “Ultra-broadband infrared metasurface absorber: comment.”
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
The cross polarization analysis done in “Ultra-broadband infrared metasurface absorber: comment” is similar to studies already conducted in [1–4]. The analysis reveals that the design provides only two absorption peaks rather than broadband absorption due to its diagonally symmetric geometry (in which the cross-polarization reflection is neglected) [5], but such various design configurations reported by various authors [6–11]. On one hand, several commentaries on this issue have been published [1–4], and there is not much sense in repeating this issue. On the other hand, it is concluded that the design of a monolayer broadband microwave absorber is still a challenge, and it is more meaningful to develop new technologies to reduce cross polarization reflection as reported in [12].
Actually, we realized this issue (cross-polarization reflection was neglected in our result [5]) almost one year ago. Through a comprehensive comparison and analysis, we found that all these reported broadband absorbers [5–11] were designed by breaking the symmetry of the resonators. Though these configurations with asymmetric resonators are poor absorbers, they are actually good candidates of efficient polarization converters [13,14]. Inspired by this discovery, we paved a new way for the design of high-performance polarization convertor [15]. We demonstrated that an ultra-wideband and high-efficiency reflective cross-polarization convertor could be achieved by breaking the symmetry of the resonator unit of a perfect absorber. The design, simulation, and experiment are in good agreement. In the Introduction [15], we pointed out that these reported broadband absorbers including our result [5] are actually poor absorbers when the cross-polarized reflection is considered.
The resonators become anisotropic when the symmetry along the x and y axes is broken. As demonstrated in Fig. 4 [15], there is a phase difference () between Eru and Erv, which leads to that the synthetic reflection field Er rotates 90 degrees relative to the incident field Ei. In [16], Qu et al. established a generic phase diagram to understand the diversified functionalities (ranging from perfect absorption to phase modulation) discovered on metal-dielectric-metal (MIM) configurations. With symmetric resonators, a perfect absorption happens when Qa = Qr, where Qa and Qr are the absorptive and radiative quality factors of the system, respectively. When the symmetry of the resonators is broken, phase-modulation effect can be achieved, which means Qa>Qr.
Funding
Chongqing Research Program of Basic Research and Frontier Technology (cstc2018jcyjA0572).
Acknowledgment
We sincerely thanks the editors for giving us a chance to reply on this issue.
References
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