Control of visible-range transmission and reflection haze by varying pattern size, shape and depth in flexible metasurfaces.

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Frontiers of Optoelectronics Pub Date : 2024-07-30 DOI:10.1007/s12200-024-00125-3
Avijit Maity, Vaswati Biswas, R Vijaya
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Abstract

Cost-effective soft imprint lithography technique is used to prepare flexible thin polymeric surfaces containing a periodic arrangement of nanodimples and nanobumps of sub-micron size. Using a single master mold of self-assembled colloidal crystal, metasurfaces with different depths and heights of patterns with a fixed pitch are possible, which makes the process inexpensive and simple. These metasurfaces are studied for their diffuse and total transmission and reflection spectra in the visible range. The transmission haze and reflection haze are calculated from the measurements. The surface containing nanobumps of lesser pattern height result in higher values of reflection and transmission haze than from surfaces containing nanodimples of much higher depth for the same pitch. The haze is more dependent on the pattern depth or height and less dependent on the pitch of the pattern. Far-field transmission profiles measured in the same wavelength range from the patterned surfaces show that the scattering increases with the increase of the ratio of pattern depth/height to pitch, similar to the haze measurements conducted with a closed integrating sphere. These profiles show that the angular spread of scattered light in transmission is within 10°, explaining the reason for the relatively low transmission haze in all the patterned surfaces. Simulation results confirm that the nanobump pattern gives higher transmission haze compared to nanodimple pattern. By controlling the ratio of pattern depth/height to pitch of the features on these surfaces, both an increase in optical haze and a balance between total reflection intensity and total transmission intensity can be achieved.

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通过改变柔性超表面的图案大小、形状和深度来控制可见光范围内的透射和反射雾度。
本研究利用经济高效的软压印光刻技术制备了柔性薄聚合物表面,该表面含有周期性排列的亚微米级纳米微粒和纳米凸点。利用自组装胶体晶体的单个母模,可以制备出具有不同深度和高度的固定间距图案的元表面,从而使制备过程既便宜又简单。我们研究了这些元表面在可见光范围内的漫反射、全透射和反射光谱。根据测量结果计算出透射雾度和反射雾度。在相同间距下,含有图案高度较小的纳米凸点的表面,其反射雾度和透射雾度的值要高于含有深度较大的纳米凹点的表面。雾度与图案深度或高度的关系较大,而与图案间距的关系较小。在相同波长范围内从图案表面测量的远场透射曲线显示,散射随图案深度/高度与间距之比增加而增加,这与使用封闭积分球进行的雾度测量类似。这些剖面图显示,透射散射光的角度散布在 10° 以内,这就解释了所有图案表面透射雾度相对较低的原因。模拟结果证实,纳米凸点图案比纳米简单图案的透射雾度更高。通过控制这些表面的图案深度/高度与特征间距之比,既能增加光学雾度,又能实现总反射强度与总透射强度之间的平衡。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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