Ultranarrow-band metagrating absorbers for sensing and modulation
Ultranarrow-band metagrating absorbers for sensing and modulation
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DOI：
10.1364/oe.26.028197
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发表时间：
2018-10-29
期刊：
影响因子：
3.8
通讯作者：
Sun, Xiankai
中科院分区：
文献类型：
--
作者：
Feng, Aosong;Yu, Zejie;Sun, Xiankai
纳米结构等离子体超材料是窄中心点带光学吸收的优秀平台，在传感、滤波、调制和发射定制方面具有广泛的应用。然而，实现光学传感和光动态控制的亚纳米吸收带宽仍然具有挑战性。在这里，我们提出了一种非对称元光栅结构，并利用具有较小耗散率的传播表面等离子体模式，在1.55μm波长附近实现了带宽为0.28nm的完美光学吸收。我们提出的结构可以在溶液环境中用作可见光谱范围内的化学或生物传感器，只需改变结构参数即可。该传感器的灵敏度为 440 nm/RIU，品质因数为 1333.33 RIU-1。此外，通过将有机电光材料与这种元光栅相结合，我们的设备可以重新配置，动态范围为 15.52 dB。因此，我们提出的元光栅平台不仅可以用作超窄带吸收器，还可以用于光学传感和光的动态控制。 (C) 2018 年美国光学协会根据 OSA 开放获取出版协议条款
Nanostructured plasmonic metamaterials are an excellent platform for narrow center dot band optical absorption, which has wide applications in sensing, filtering, modulation.. and emission tailoring. However, achieving a subnanometer absorption bandwidth for optical sensing and dynamical control of light is still challenging. Here, we propose an asymmetric metagrating structure and make use of the propagating surface plasmonic mode that has a small dissipation rate, to achieve perfect optical absorption with a bandwidth of 0.28 nm near the wavelength of 1.55 mu m. Our proposed structure can be used in solution environments as a chemical or biological sensor in the visible spectral range just by changing the structural parameters. The sensor possesses a sensitivity of 440 nm/RIU and figure of merit of 1333.33 RIU-1. In addition, by combining an organic electro-optic material with this metagrating, our device can be reconfigurable with a dynamic range of 15.52 dB. Therefore, our proposed metagrating platform not only works as an ultranarrow-band absorber, but also can be employed for optical sensing and dynamic control of light. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement