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首页> 外文会议>Conference on Terahertz Physics, Devices, and Systems >Photomodulation of Metamaterial: An Integrated Approach
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Photomodulation of Metamaterial: An Integrated Approach

机译：超材料的光调节：综合方法

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In this paper, we present an integrated fabrication process for realizing a switching/modulation mechanism for negative index materials (NIMs) based on photoconductive coupling. The metamaterial element chosen is an array of regular copper split-ring resonator (SRR) that was fabricated on two different substrates: high-resistivity silicon (HRS) and fused silica glass. The switching mechanism proposed can be achieved through tuning the SRR gap and/or substrate conductivity. The photosensitive material of the SRR structure (amorphous silicon for the glass substrate samples and intrinsic silicon for the HRS substrate samples) upon illumination generates excess carriers that essentially shunt the gap capacitance thus diminishing the resonance response significantly. The response in terms of S-parameters is simulated using HFSS under varying magnitude of optical illumination. Our simulation with a single SRR to demonstrate total suppression of resonance amplitude with a high extinction ratio is applicable to NTMs comprising of both negative permeability and negative permittivity without any loss of generality. This method may provide a basis for long-sought practical applications and devices based on NTM in the fields of ultra-fast communications at RF and optical frequencies, sensing and imaging promising a potential of dramatically improving the performance of existing phased array antennas, optical beam-forming networks, antenna remoting and transportation of RF power through fiber-radio.
机译：在本文中，我们提出了用于实现基于感光耦合的负折射率材料（的NIM）切换/调制机构的集成制造工艺。所选择的超材料元件是在两种不同的衬底上制造的常规铜开口谐振环（SRR）的阵列：高电阻率硅（HRS）和熔凝石英玻璃。所提出的切换机构可通过调整间隙SRR和/或衬底的导电来实现。所述SRR结构的感光材料照射时（对于玻璃基板的样品和用于HRS衬底试样征硅非晶硅）产生过量载流子基本上分流间隙电容从而显著削弱了谐振响应。在S参数方面的响应是使用HFSS下变化的光学照明的大小模拟。我们用单SRR模拟以证明谐振振幅的总抑制具有高消光比是适用于包括两个负磁导率和负介电常数的不失一般性的任何损失非关税措施。该方法可以用于在RF超快通信和光频率的字段根据NTM长期寻求的实际应用和设备提供了基础，感测和成像有前途的显着改进现有的相控阵天线的性能，光束的电位 - 形成网络，远程天线和射频功率的运输通过光纤无线电。

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