Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor.
Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor.
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DOI：
10.3390/ma11071091
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发表时间：
2018-06-27
期刊：
影响因子：
--
通讯作者：
Miroshnichenko AE
中科院分区：
文献类型：
--
作者：
Rifat AA;Rahmani M;Xu L;Miroshnichenko AE
我们提出了一种基于混合超表面的完美吸收体，它具有接近统一的吸光度，并且可以用作折射率传感器。我们使用金反射镜来阻止透射，并在金反射镜顶部使用非晶硅（a-Si）纳米盘阵列，在正常入射时通过散射光来帮助激发表面等离子体。对其导引性能进行了数值研究。该吸收剂与极化无关，在空气介质中932 nm波长处的最大吸收率为99.8%。考虑到实际应用，将环境折射率从1.33变化到1.41，所提出的吸收器可以保持在99.7%以上的吸收率，并具有谐振波长的红移。由于电偶极子和磁偶极子的阻抗匹配，该吸收体在1.33 ~ 1.41的折射率范围内具有接近均匀的吸光度，在特定波长处具有零反射特性。这一特性可以作为等离子体传感器用于检测周围介质的折射率。在1.33 ~ 1.41的感应范围内，等离子体传感器的平均灵敏度为325 nm/RIU，最大灵敏度为350 nm/RIU。该装置在太阳能光电探测器、有机和生物化学检测方面具有潜在的应用前景。
We propose a hybrid metasurface-based perfect absorber which shows the near-unity absorbance and facilities to work as a refractive index sensor. We have used the gold mirror to prevent the transmission and used the amorphous silicon (a-Si) nanodisk arrays on top of the gold mirror which helps to excite the surface plasmon by scattering light through it at the normal incident. We numerically investigated the guiding performance. The proposed absorber is polarization independent and shows a maximum absorption of 99.8% at a 932 nm wavelength in the air medium. Considering the real applications, by varying the environments refractive indices from 1.33 to 1.41, the proposed absorber can maintain absorption at more than 99.7%, with a red shift of the resonant wavelength. Due to impedance matching of the electric and magnetic dipoles, the proposed absorber shows near-unity absorbance over the refractive indices range of 1.33 to 1.41, with a zero-reflectance property at a certain wavelength. This feature could be utilized as a plasmonic sensor in detecting the refractive index of the surrounding medium. The proposed plasmonic sensor shows an average sensitivity of 325 nm/RIU and a maximum sensitivity of 350 nm/RIU over the sensing range of 1.33 to 1.41. The proposed metadevice possesses potential applications in solar photovoltaic and photodetectors, as well as in organic and bio-chemical detection.
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DOI：
10.3390/s16081246
发表时间：
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期刊：
Sensors (Basel, Switzerland)
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