Laser-Printed Emissive Metasurface as an Anticounterfeiting Platform,Laser & Photonics Reviews

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Laser-Printed Emissive Metasurface as an Anticounterfeiting Platform
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-07-03 , DOI: 10.1002/lpor.202200215
Chanhee Kim ₁ , Yeongseon Kim ₁ , Dongkyun Kang ₁ , Myeongkyu Lee ₁

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Optical security is a promising application of metasurfaces because light has large degrees of freedom in metasurfaces. Although many different structures/materials are proposed for this purpose, the fabrication of dynamic metasurfaces in a straightforward and scalable manner, while maintaining a high security level, remains a significant challenge. Herein, a metasurface consisting of a phase-changing GeSbTe layer and a metal back reflector is presented to space-selectively and dynamically control the infrared emission of the surface by a spatially modulated pulsed laser beam. Unlike conventional laser processes using a focused beam, the employed laser printing is an expanded beam-based parallel process that enables the fabrication of wafer-sized emission patterns. Owing to the multispectral responses of GeSbTe, mutually independent visible and infrared images can be printed in one region. Grayscale emission patterns can also be obtained by gradually modulating the spatial profile of the laser beam, which makes the replication of laser-printed emission patterns extremely difficult. These encouraging features indicate that the presented emissive metasurface has the potential for use as an effective platform for anticounterfeiting.

中文翻译：

激光打印发射超表面作为防伪平台

光学安全是超表面的一个有前途的应用，因为光在超表面中具有很大的自由度。尽管为此目的提出了许多不同的结构/材料，但以直接和可扩展的方式制造动态超表面，同时保持高安全级别，仍然是一个重大挑战。在此，提出了由相变 GeSbTe 层和金属背反射器组成的超表面，以通过空间调制的脉冲激光束对表面的红外发射进行空间选择性和动态控制。与使用聚焦光束的传统激光工艺不同，所采用的激光打印是一种基于扩展光束的平行工艺，可以制造晶圆尺寸的发射图案。由于 GeSbTe 的多光谱响应，可以在一个区域打印相互独立的可见光和红外图像。灰度发射模式也可以通过逐渐调制激光束的空间分布来获得，这使得激光打印发射模式的复制变得非常困难。这些令人鼓舞的特征表明，所提出的发射超表面具有用作有效防伪平台的潜力。

更新日期：2022-07-03

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