In terahertz (THz) photonics, there is an ongoing effort to develop thin, compact devices such as dielectric photonic crystal (PhC) slabs with desirable light–matter interactions. However, previous works in THz PhC slabs have been limited to rigid substrates with thicknesses ${\sim}100\,\,{\rm s}$ of micrometers. Dielectric PhC slabs have been shown to possess in-plane modes that are excited by external radiation to produce sharp guided-mode resonances with minimal absorption for applications in sensors, optics, and lasers. Here we confirm the existence of guided resonances in a membrane-type THz PhC slab with subwavelength (${\lambda _0}/6 {-} {\lambda _0}/12$) thicknesses of flexible dielectric polyimide films. The transmittance of the guided resonances was measured for different structural parameters of the unit cell. Furthermore, we exploited the flexibility of the samples to modulate the guided modes for a bend angle of $\theta \ge {5^ \circ }$, confirmed experimentally by the suppression of these modes. The mechanical flexibility of the device allows for an additional degree of freedom in system design for high-speed communications, soft wearable photonics, and implantable medical devices.

中文翻译：

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柔性2D太赫兹光子晶体中的引导模式共振

在太赫兹（THz）光子学中，正在努力开发薄而紧凑的器件，例如具有理想的光-质相互作用的介电光子晶体（PhC）平板。但是，以前在THz PhC平板中所做的工作仅限于厚度为$ {\ sim} 100 \，\，{\ rm s} $微米的刚性基板。介电PhC平板已显示出具有平面模式，该模式可被外部辐射激发以产生尖锐的引导模式共振，并具有最小的吸收，可用于传感器，光学器件和激光器。在这里，我们确认了亚波长（$ {\ lambda _0} / 6 {-} {\ lambda _0} / 12 $的膜型THz PhC平板中存在引导共振。）柔性电介质聚酰亚胺薄膜的厚度。对于单位晶胞的不同结构参数，测量了引导共振的透射率。此外，我们利用样本的灵活性来调整导模的弯曲角度为\\ theta \ ge {5 ^ \ circ} $，这些实验已通过抑制这些模态得到了证实。该设备的机械灵活性为高速通信，可穿戴软光子学和可植入医疗设备的系统设计提供了更多的自由度。