Zhang Yifei, Zhang Baoqing, Li Zhaolin, Feng Mingming, Ling Haotian, Zhang Xijian, Wang Xiaomu, Wang Qingpu, Song Aimin, Chen Hou-Tong
Shandong Technology Center of Nanodevices and Integration, School of Integrated Circuits, Shandong University, Jinan, 250100, China.
National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210023, China.
Nanophotonics. 2024 Jan 8;13(12):2207-2212. doi: 10.1515/nanoph-2023-0643. eCollection 2024 May.
Fabry-Pérot (F-P) cavity and metal hole array are classic photonic devices. Integrating F-P cavity with holey metal typically enhances interfacial reflection and dampens wave transmission. In this work, a hybrid bound surface state is found within rectangular metal holes on a silicon substrate by merging an extraordinary optical transmission (EOT) mode and a high-order F-P cavity mode both spatially and spectrally. Transmission, Q-factor, and bandwidth can be enhanced significantly with respect to the classical EOT and F-P interference by simply sweeping the cavity length. This state can provide EOT properties and ten times broader EOT bandwidth well below the effective plasma frequency of the periodic metal holes, where the metal holes typically show evanescent properties and do not support EOT in theory. Furthermore, a large modulation range of 25 % and 39 % is demonstrated with various graphene patterns for the transmittance of this hybrid state at 500 and 582 GHz, respectively.
法布里 - 珀罗（F - P）腔和金属孔阵列是经典的光子器件。将F - P腔与多孔金属集成通常会增强界面反射并抑制波传输。在这项工作中，通过在空间和光谱上合并异常光学传输（EOT）模式和高阶F - P腔模式，在硅衬底上的矩形金属孔内发现了一种混合束缚表面态。相对于经典的EOT和F - P干涉，通过简单地扫描腔长，传输、品质因数和带宽都可以得到显著提高。这种状态可以提供EOT特性，并且在远低于周期性金属孔的有效等离子体频率的情况下，EOT带宽扩大了十倍，在该频率下金属孔通常表现出倏逝特性，理论上不支持EOT。此外，分别用各种石墨烯图案在500和582 GHz下对这种混合态的透射率进行了演示，调制范围分别达到25%和39%。
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