The cover illustrates reflective optical limiters that incorporate phase-transition vanadium dioxide into arrays of metallic aperture antennas. As demonstrated by Mikhail A. Kats and co-workers in article number 2100001, these devices have broadband transmittance for low-intensity illumination and high reflectance when the incident intensity increases, and thus help protect sensitive detectors from high-power illumination. The reflective high-intensity state minimizes absorption, and thus increases the damage threshold of the device. [Image credit: X. Zou]

中文翻译：

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反射式光学限幅器：超薄宽带反射式光学限幅器（Laser Photonics Rev. 15(6)/2021）

封面说明了将相变二氧化钒结合到金属孔径天线阵列中的反射光学限幅器。正如 Mikhail A. Kats 及其同事在文章编号 2100001 中所证明的那样，这些设备具有适用于低强度照明的宽带透射率和入射强度增加时的高反射率，从而有助于保护敏感探测器免受高功率照明的影响。反射高强度状态最大限度地减少了吸收，从而增加了器件的损坏阈值。[图片来源：X.邹]