宽带光功率限制器超透镜
Broadband optical power limiter metalens
摘要：
近年来，从直接激光加工、光检测、医学和照明等不同应用中，对高功率激光的需求引起了极大的兴趣。然而，具有高强度的高功率激光给具有低阈值损伤的光学探测器和成像系统带来了根本性的问题，这些问题仍然需要可靠的解决方案。在这里，我们报告并数值演示了一个混合系统，该系统协同结合了宽带光功率限制器，其在开状态（70 ° C）和关状态（25 ° C）之间的透射率差约为62.5%，以及从1534 nm到1664 nm的衍射受限宽带超透镜。这样的超透镜功率限制器可以用于在到检测器的光路中需要中间焦平面以免受暴露于高强度激光的损坏的任何系统中。
英文摘要：
In recent years, the need for high-power laser is of great interest for different applications ranging from direct-laser processing, light detection, medicine, and lighting. However, high-power lasers with high intensities give rise to fundamental problems for optical detectors and imaging systems with low threshold damage, which still need reliable solutions. Here, we report and numerically demonstrate a hybrid system that synergically combines a broadband optical power limiter with a transmittance difference between on-state (70^o C) and off-state (25^o C) about 62.5%, and a diffraction-limited broadband metalens from 1534 nm to 1664 nm. Such a metalens power limiter could be used in any system requiring an intermediate focal plane in the optical path to the detector from damage by exposure to high-intensity lasers.
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