Lepicard Antoine, Bondu Flavie, Kang Myungkoo, Sisken Laura, Yadav Anupama, Adamietz Frederic, Rodriguez Vincent, Richardson Kathleen, Dussauze Marc
Université de Bordeaux, Institut des Sciences Moléculaires, UMR 5255 CNRS, 351 Cours de la Libération, 33405, Talence Cedex, France.
Department of Materials Science and Engineering, College of Optics and Photonics, University of Central Florida, Orlando, FL, United States.
Sci Rep. 2018 May 9;8(1):7388. doi: 10.1038/s41598-018-25481-x.
The potential for realizing robust, monolithic, near-surface refractive micro-optic elements with long-lived stability is demonstrated in visible and infrared transmitting glasses capable of use in dual band applications. Employing an enhanced understanding of glass chemistry and geometric control of mobile ion migration made possible with electrode patterning, flat, permanent, thermally-poled micro-optic structures have been produced and characterized. Sub-surface (t~5-10 µm) compositional and structural modification during the poling process results in formation of spatially-varying refractive index profiles, exhibiting induced Δn changes up to 5 × 10 which remain stable for >15 months. The universality of this approach applied to monolithic vis-near infrared [NIR] oxide and NIR-midwave infrared [MIR] chalcogenide glass materials is demonstrated for the first time. Element size, shape and gradient profile variation possible through pattern design and fabrication is shown to enable a variety of design options not possible using other GRIN process methodologies.
在可用于双波段应用的可见和红外透射玻璃中，展示了实现具有长期稳定性的坚固、整体式近表面折射微光学元件的潜力。通过对玻璃化学的深入理解以及利用电极图案化实现对移动离子迁移的几何控制，已制备并表征了平面、永久、热极化的微光学结构。极化过程中次表面（t~5 - 10 µm）的成分和结构改性导致形成空间变化的折射率分布，诱导的Δn变化高达5×10，并且在超过15个月的时间内保持稳定。首次证明了这种方法应用于整体式可见-近红外（NIR）氧化物和近红外-中波红外（MIR）硫属化物玻璃材料的通用性。通过图案设计和制造实现的元件尺寸、形状和梯度分布变化能够提供多种设计选项，这是使用其他渐变折射率（GRIN）工艺方法无法实现的。
