Guided-mode resonances in flexible 2D terahertz photonic crystals
Guided-mode resonances in flexible 2D terahertz photonic crystals
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DOI：
10.1364/optica.388761
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发表时间：
2020-05-20
期刊：
影响因子：
10.4
通讯作者：
Searles, Thomas A.
中科院分区：
文献类型：
--
作者：
Kyaw, Chan;yahiaoui, Riad;Searles, Thomas A.
在太赫兹（THz）光子学中，人们正在努力开发薄而紧凑的器件，如具有理想光-物质相互作用的介电光子晶体（PhC）板。然而，以前在太赫兹PhC板上的工作仅限于厚度类似于100微米的刚性基材。介质PhC板已被证明具有由外部辐射激发的平面内模式，以最小的吸收产生尖锐的导模共振，用于传感器，光学和激光器。在这里，我们证实了薄膜型太赫兹PhC板在亚波长(λ (0)/6- λ(0)/12)厚度的柔性介电聚酰亚胺薄膜中存在引导共振。测量了不同结构参数下导共振的透过率。此外，我们利用样品的灵活性来调制导模为θ >= 5度的弯曲角，实验证实了这些模式的抑制。该设备的机械灵活性为高速通信、软可穿戴光子学和植入式医疗设备的系统设计提供了额外的自由度。(C) 2020年美国光学学会根据OSA开放获取出版协议的条款
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 similar to 100 s of micrometers. Dielectric PhC slabs have been shown to possess inplane 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 >= 5 degrees, 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. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement