  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.
