Fast-switching reconfigurable metadevice with metasurface-induced liquid crystal alignment for light modulator applications

IF 2.8 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xin Chang, Mike Pivnenko, Angadjit Singh, Weijie Wu, Pawan Shrestha, and Daping Chu
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引用次数: 0

Abstract

Metasurface technology is progressing rapidly towards commercialization and productization, due to its unparallelled advantages over conventional optical solutions. The reconfigurable metasurface, exhibiting more flexibility and capacity than its static counterpart, has been one of the most pursued features of metasurface. In this work, we present liquid crystal-based dynamic metasurface by immersing metasurface in nematic liquid crystal environment. No alignment material was used, and liquid crystal was aligned directly by metasurface. The alignment quality was characterized and the intensity contrast of 33 was obtained. Optical amplitude modulation was achieved with the modulation depth of 91% at the wavelength of 1375 nm. Moreover, sub-micrometre cell gap of 875 nm was realized, and the response time was measured to be sub-millisecond at room temperature, translating to > 1KHz operation frequency. The higher operation frequency of > 3.4 KHz was recorded at elevated temperature. The key performance indicators demonstrated in this work showcase the promising future of liquid crystal – based reconfigurable metasurface, especially for fast light modulator applications.//Metasurface technology is progressing rapidly toward commercialization and productization due to its unparalleled advantages over conventional optical solutions. The reconfigurable metasurface, exhibiting more flexibility and capacity than its static counterpart, has been one of the most pursued features of the metasurface. In this work, we present a liquid crystal-based dynamic metasurface by immersing the metasurface in a nematic liquid crystal environment. No alignment material was used, and liquid crystal was aligned directly by metasurface. The alignment quality was characterized, and the intensity contrast of 33 was obtained. Optical amplitude modulation was achieved with a modulation depth of 91% at the wavelength of 1375 nm. Moreover, a sub-micrometer cell gap of 875 nm was realized, and the response time was measured to be sub-millisecond at room temperature, translating to > 1KHz operation frequency. The higher operation frequency of > 3.4 KHz was recorded at elevated temperatures. The key performance indicators demonstrated in this work showcase the promising future of liquid crystal-based reconfigurable metasurface, especially for fast light modulator applications.
用于光调制器应用的具有元表面诱导液晶对准功能的快速开关可重构元器件
与传统光学解决方案相比,元表面技术具有无可比拟的优势,因此正朝着商业化和产品化的方向快速发展。与静态元表面相比,可重新配置的元表面具有更大的灵活性和容量,这一直是元表面最受追捧的特性之一。在这项工作中,我们通过将元表面浸入向列液晶环境,提出了基于液晶的动态元表面。没有使用对准材料,液晶直接由元表面对准。对准质量进行了表征,并获得了 33 的强度对比度。在波长为 1375 nm 时,实现了光学振幅调制,调制深度达到 91%。此外,还实现了 875 纳米的亚微米单元间隙,室温下的响应时间为亚毫秒级,工作频率为 1KHz。在高温条件下,工作频率更高,达到 3.4 千赫兹。这项工作中展示的关键性能指标表明,基于液晶的可重构元表面技术前景广阔,特别是在快速光调制器应用方面。与静态元表面相比,可重新配置的元表面具有更高的灵活性和容量,这一直是元表面最受追捧的特性之一。在这项工作中,我们通过将元表面浸入向列液晶环境,展示了一种基于液晶的动态元表面。没有使用对准材料,液晶直接由元表面对准。对准质量进行了表征,并获得了 33 的强度对比度。在波长为 1375 nm 时,实现了光学振幅调制,调制深度达到 91%。此外,还实现了 875 nm 的亚微米单元间隙,室温下的响应时间为亚毫秒级,工作频率为 1KHz。在高温条件下,工作频率更高,达到 3.4 千赫兹。这项工作中展示的关键性能指标展示了基于液晶的可重构元表面的美好前景,尤其是在快速光调制器应用方面。
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来源期刊
Optical Materials Express
Optical Materials Express MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
5.50
自引率
3.60%
发文量
377
审稿时长
1.5 months
期刊介绍: The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optical Materials Express (OMEx), OSA''s open-access, rapid-review journal, primarily emphasizes advances in both conventional and novel optical materials, their properties, theory and modeling, synthesis and fabrication approaches for optics and photonics; how such materials contribute to novel optical behavior; and how they enable new or improved optical devices. The journal covers a full range of topics, including, but not limited to: Artificially engineered optical structures Biomaterials Optical detector materials Optical storage media Materials for integrated optics Nonlinear optical materials Laser materials Metamaterials Nanomaterials Organics and polymers Soft materials IR materials Materials for fiber optics Hybrid technologies Materials for quantum photonics Optical Materials Express considers original research articles, feature issue contributions, invited reviews, and comments on published articles. The Journal also publishes occasional short, timely opinion articles from experts and thought-leaders in the field on current or emerging topic areas that are generating significant interest.
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