Ultrafast laser-induced integrated property–structure modulation of Ge2Sb2Te5 for multifunction and multilevel rewritable optical recording

Author:

Zhao Kang1,Han Weina12ORCID,Han Zihao3,Zhang Xiaobin1,Zhang Xingyi1,Duan Xiaofeng12,Wang Mengmeng12,Yuan Yanping3ORCID,Zuo Pei4

Affiliation:

1. Laser Micro/Nano-Fabrication Laboratory , School of Mechanical Engineering, Beijing Institute of Technology , Beijing 100081 , China

2. Beijing Institute of Technology Chongqing Innovation Center , Chongqing 401120 , China

3. Beijing Engineering Research Center of Applied Laser Technology, Beijing University of Technology , Beijing 100124 , China

4. School of Mechanical and Electrical Engineering, Wuhan Institute of Technology , Wuhan 430073 , China

Abstract

Abstract In this paper, we report an approach for tuning the surface morphology and phase of Ge2Sb2Te5 (GST) by using an ultrafast laser in a one-step process. Four surface micro/nanostructures with specific phase states were sequentially formed by changing the pulse energy: the modified ripple structure, the completely crystallized structure, the ablated nanodots, and the ablated ripple structure. A high correlation existed between the surface micro/nanostructures and their property. Through integrated property–structure modulation, multifunctional optical recording could be achieved by using modified ripples with specific crystallized phase states. The geometric grating morphology caused by the volume shrinkage effect during crystallization enabled modified ripples to exhibit a structural color based on the grating’s diffraction effect. Moreover, the considerable change in the reflectivity of the crystallized area enabled easy grayscale identification. On the basis of the spatially resolved phase-transition threshold effect, the integrated modulation of the geometric nanograting proportion and degree of crystallization was conducted in multilevel states. Notably, different from the fixed ablated surface structures, the printed modified surface structures could be erased and rewritten by controlling its phase state. This paper presents a promising method for producing dynamic tunable metasurfaces, conducting optical anticounterfeiting, and achieving information storage.

Funder

National Natural Science Foundation of China

Chongqing Natural Science Foundation of China

Beijing Municipal Commission of Education

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

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