材料科学
聚二甲基硅氧烷
纳米压印光刻
纳米技术
制作
模具
聚乙烯醇
复合材料
医学
病理
替代医学
作者
Hojung Choi,Joohoon Kim,Won-Joong Kim,Junhwa Seong,Chan-Woong Park,Minseok Choi,Nak-Hyun Kim,Jisung Ha,Cheng‐Wei Qiu,Junsuk Rho,Heon Lee
出处
期刊:PhotoniX
[Springer Nature]
日期:2023-06-15
卷期号:4 (1)
被引量:4
标识
DOI:10.1186/s43074-023-00096-2
摘要
Abstract Nanoimprint lithography (NIL) has attracted attention recently as a promising fabrication method for dielectric metalenses owing to its low cost and high throughput, however, high aspect ratio (HAR) nanostructures are required to manipulate the full 2π phase of light. Conventional NIL using a hard-polydimethylsiloxane (h-PDMS) mold inevitably incurs shear stress on the nanostructures which is inversely proportional to the surface area parallel to the direction of detachment. Therefore, HAR structures are subjected to larger shear stresses, causing structural failure. Herein, we propose a novel wet etching NIL method with no detachment process to fabricate flawless HAR metalenses. The water-soluble replica mold is fabricated with polyvinyl alcohol (PVA) which is simpler than an h-PDMS mold, and the flexibility of the PVA mold is suitable for direct printing as its high tensile modulus allows high-resolution patterning of HAR metalenses. The diffraction-limited focusing of the printed metalenses demonstrates that it operates as an ideal lens in the visible regime. This method can potentially be used for manufacturing various nanophotonic devices that require HAR nanostructures at low cost and high throughput, facilitating commercialization.
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