Terahertz refractive index control of 3D printing materials by UV exposure

IF 2.2 3区 物理与天体物理 Q2 OPTICS
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Abstract

Recently, significant progress has been made in the development of THz optics based on metamaterials to overcome the limited availability of suitable materials for conventional optics. Although 3D printing technology is a promising method for rapidly fabricating these subwavelength structures, the structural degree of freedom for 3D printed metamaterials is still limited by the optical properties of printing materials. In this study, we controlled the THz refractive index and extinction coefficient of the 3D printing resin by UV exposure doses during the printing process. Samples were fabricated as uniform plates under different curing conditions in printing, and their optical properties were measured in the range between 0.3 THz and 2.0 THz using THz time-domain spectroscopy (THz-TDS). The refractive index and extinction coefficient were changed from 1.65 to 1.80, and from 0.04 to 0.12, respectively, with increasing UV doses from 1 mJ/cm2, which allows resin to solidify and become printable, to 100 mJ/cm2, where the optical changes become almost saturated. The results provide insights into optimizing the fabrication process of THz devices, even those with a gradient and complex refractive index profile, by utilizing 3D printing technology for a broad range of applications.
通过紫外线照射控制 3D 打印材料的太赫兹折射率
最近,在开发基于超材料的太赫兹光学器件方面取得了重大进展,以克服传统光学器件适用材料有限的问题。虽然三维打印技术是快速制造这些亚波长结构的有效方法,但三维打印超材料的结构自由度仍然受到打印材料光学特性的限制。在本研究中,我们在打印过程中通过紫外线照射剂量控制了三维打印树脂的太赫兹折射率和消光系数。在打印过程中的不同固化条件下,样品被制作成均匀的板材,并使用太赫兹时域光谱(THz-TDS)测量了它们在 0.3 THz 至 2.0 THz 范围内的光学特性。随着紫外线剂量的增加,折射率和消光系数分别从 1 mJ/cm2 变为 1.65 至 1.80,从 0.04 变为 0.12,其中 1 mJ/cm2 使树脂固化并可印刷,而 100 mJ/cm2 则使光学变化几乎达到饱和。这些结果为利用三维打印技术优化太赫兹器件(即使是具有梯度和复杂折射率轮廓的器件)的制造工艺提供了启示,使其应用范围更加广泛。
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来源期刊
Optics Communications
Optics Communications 物理-光学
CiteScore
5.10
自引率
8.30%
发文量
681
审稿时长
38 days
期刊介绍: Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.
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