Yan Miao, Jiang Wei, Mengda Xu, Qingkang Wang, Xuesong Jiang
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引用次数: 0
摘要
太赫兹(THz)波段的导模共振滤波器(GMRF)线宽较窄,是太赫兹生物传感和成像的一种有效方法。受 1 太赫兹以上可获得的低损耗材料、制造技术和调谐方法的限制,实现宽频率范围可调的动态可调太赫兹 GMRF 面临着巨大挑战。在此,我们通过纳米压印太赫兹低损耗弹性体苯乙烯-丁二烯-苯乙烯(SBS)薄膜,提出了一种具有扩展工作频率的动态可调波导光栅结构。利用简单的张力场控制和弹性体的泊松比,可以实现显著的蓝移和红移可调性。当 SBS GMRF 沿着光栅线拉伸时,在 300% 的应变下,蓝移从 2.63 太赫兹增加到 3.29 太赫兹。当施加垂直拉伸时,在 150% 应变下,红移显著跨越 3.72 THz,显示出突出的应变敏感性。此外,SBS 的微观相分离使其具有形状记忆特性,因此循环拉伸 SBS GMRF 可保持稳定的机械和光学性能。因此,基于 SBS 的弹性和形状可逆 GMRF 将成为可调谐太赫兹光学器件的绝佳策略。
Dynamic Terahertz Guided-Mode Resonance Filter for Broadband Tunability
A guided-mode resonance filter (GMRF) in the terahertz (THz) band gaining narrow line width is a vigorous approach for THz biosensing and imaging. Limited by accessible low-loss materials above 1 THz, fabrication techniques, and tuning methods, a dynamically tunable THz GMRF implementing broad frequency range tunability faces great challenges. Here, by nanoimprinting a THz low-loss elastomer styrene–butadiene–styrene (SBS) film, we propose a dynamically tunable waveguide grating structure with an expanded work frequency. Utilizing simple tension field control and Poisson’s ratio of elastomer, remarkable blueshift and redshift tunability could both be realized. When the SBS GMRF was elongated along the grating lines, a blueshift occurred from 2.63 to 3.29 THz under 300% strain. While applying perpendicular stretching, the redshift dramatically spanned 3.72 THz under 150% strain, presenting prominent strain sensitivity. Additionally, the microscopic phase separation of SBS makes it exhibit the characteristics of shape memory; hence, the cyclically stretched SBS GMRF maintained stable mechanical and optical performance. Hence, the elastic and shape reversible SBS-based GMRF will be a brilliant strategy for a tunable THz optical device.
期刊介绍:
ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers.
The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.