Lu Youyan, Liu Liyun, Gao Ruoqian, Xiong Ying, Sun Peiqing, Wu Zhanghao, Wu Kai, Yu Tong, Zhang Kai, Zhang Cheng, Bourouina Tarik, Li Xiaofeng, Liu Xiaoyi
School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China.
Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, China.
Light Sci Appl. 2024 Sep 6;13(1):241. doi: 10.1038/s41377-024-01572-5.
Pyroelectric (PE) detection technologies have attracted extensive attention due to the cooling-free, bias-free, and broadband properties. However, the PE signals are generated by the continuous energy conversion processes from light, heat, to electricity, normally leading to very slow response speeds. Herein, we design and fabricate a PE detector which shows extremely fast response in near-infrared (NIR) band by combining with the inhomogeneous plasmonic metasurface. The plasmonic effect dramatically accelerates the light-heat conversion process, unprecedentedly improving the NIR response speed by 2-4 orders of magnitude to 22 μs, faster than any reported infrared (IR) PE detector. We also innovatively introduce the concept of time resolution into the field of PE detection, which represents the detector's ability to distinguish multiple fast-moving targets. Furthermore, the spatially inhomogeneous design overcomes the traditional narrowband constraint of plasmonic systems and thus ensures a wideband response from visible to NIR. This study provides a promising approach to develop next-generation IR PE detectors with ultrafast and broadband responses.
热释电（PE）探测技术因其无需冷却、无需偏置和宽带特性而受到广泛关注。然而，PE信号是由从光到热再到电的连续能量转换过程产生的，通常导致响应速度非常慢。在此，我们设计并制造了一种PE探测器，通过与非均匀等离子体超表面相结合，在近红外（NIR）波段表现出极快的响应。等离子体效应极大地加速了光热转换过程，将NIR响应速度前所未有的提高了2 - 4个数量级，达到22 μs，比任何已报道的红外（IR）PE探测器都要快。我们还创新性地将时间分辨率的概念引入到PE探测领域，它代表了探测器区分多个快速移动目标的能力。此外，空间非均匀设计克服了等离子体系统传统的窄带限制，从而确保了从可见光到NIR的宽带响应。这项研究为开发具有超快和宽带响应的下一代IR PE探测器提供了一种有前景的方法。
