Near-infrared active metamaterials and their applications in tunable surface-enhanced Raman scattering.
Near-infrared active metamaterials and their applications in tunable surface-enhanced Raman scattering.
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DOI：
10.1364/oe.22.002989
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发表时间：
2014-02
期刊：
影响因子：
3.8
通讯作者：
Xinglin Wen;Qing Zhang;J. Chai;L. Wong;Shijie Wang;Q. Xiong
中科院分区：
文献类型：
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作者：
Xinglin Wen;Qing Zhang;J. Chai;L. Wong;Shijie Wang;Q. Xiong
利用二氧化钒(VO2)的相变特性，我们实现了在近红外范围内同时调谐开环谐振器(SRR)的电模和磁模。在从绝缘相到金属相的相变过程中，电共振波长蓝移约73 nm，磁共振模式红移约126 nm。由于VO2相变的滞后现象，电模和磁模的位移都具有滞后性。除了频移外，由于金属相VO2有缩短SRR间隙的趋势，磁模也有消失的趋势。我们还展示了这种活性超材料在可调谐表面增强拉曼散射(SERS)中的应用，对于固定的激发激光波长，可以通过调节SRR的电模频率来显著改变拉曼强度，这是通过精确控制VO2的相位来实现的。
By utilizing the phase change properties of vanadium dioxide (VO2), we have demonstrated the tuning of the electric and magnetic modes of split ring resonators (SRRs) simultaneously within the near IR range. The electric resonance wavelength is blue-shift about 73 nm while the magnetic resonance mode is red-shifted about 126 nm during the phase transition from insulating to metallic phases. Due to the hysteresis phenomenon of VO2 phase transition, both the electric and magnetic modes shifts are hysteretic. In addition to the frequency shift, the magnetic mode has a trend to vanish due to the fact that the metallic phase VO2 has the tendency to short the gap of SRR. We have also demonstrated the application of this active metamaterials in tunable surface-enhanced Raman scattering (SERS), for a fixed excitation laser wavelength, the Raman intensity can be altered significantly by tuning the electric mode frequency of SRR, which is accomplished by controlling the phase of VO2 with an accurate temperature control.