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High-Performance Electro-Optic Manipulation by Plasmonic Light Absorber With Nano-Cavity Field Confinement
IEEE Photonics Journal ( IF 2.4 ) Pub Date : 2021-04-16 , DOI: 10.1109/jphot.2021.3073686
Guiqiang Liu , Qizhao Wu , Xiaoshan Liu , Xuefeng Zhan , Guolan Fu , Chaojun Tang , Zhengqi Liu

Narrowband light absorber with multi-band plasmonic resonances is numerically investigated for high-performance electrical manipulation via introducing the electro-optic (EO) medium in the slit array based grating structure. A maximal absorption efficiency of 99.5% is achieved. The spectral shift sensitivity reaches 0.99 nm/V. Besides, the large spectral intensity change is also obtained due to the use of sharp resonances, which therefore ensures the high signal-to-noise ratio for the manipulation process. It is observed that the strong surface plasmon resonance and the localized optical cavity modes can introduce the differential responses for the multiple modes under the optical adjusting process and also for the EO manipulation process. These features not only contribute to produce the new EO modulator platforms based on the light absorbers but also pave new ways for the cavity-enhanced high-performance EO operation. Moreover, the absorption properties can be well maintained in a wide range of the structural parameters, indicating the high tolerance of the fabrication process. The findings can pave new insights into the high-performance manipulations via the narrowband absorbers with strong electromagnetic field enhancement and hold wide applications in dynamic switching, filtering, displaying, etc.

中文翻译:

等离子体腔的纳米腔场等离子体吸收器的高性能光电操纵。

通过在基于狭缝阵列的光栅结构中引入电光(EO)介质,对具有多带等离子体共振的窄带光吸收器进行了数值研究,以实现高性能的电操纵。达到99.5%的最大吸收效率。光谱偏移灵敏度达到0.99 nm / V。此外,由于使用了尖锐的共振,还获得了较大的光谱强度变化,因此确保了操纵过程中的高信噪比。可以看出,强表面等离子体共振和局域光腔模可以在光学调节过程以及EO操纵过程中引入多种模式的微分响应。这些功能不仅有助于生产基于光吸收器的新型EO调制器平台,而且还为增强腔体的高性能EO操作铺平了新道路。而且,可以在宽范围的结构参数中很好地保持吸收性能,这表明制造工艺的高耐受性。这些发现可以通过具有强大电磁场增强功能的窄带吸收器为高性能操作提供新的见解,并在动态切换,滤波,显示等方面拥有广泛的应用。
更新日期:2021-04-30
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