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采用等离子体增强化学气相沉积方法(PECVD)制备了氢化非晶硅(a-Si∶H)光电导薄膜,并利用双面胶技术封装ODEP芯片。构建了包括光投影模块和视频监控模块的ODEP自动化操作实验平台。以聚苯乙烯微粒为操作对象,进行微米尺度粒子的ODEP自动化操作实验,并深入研究了交流电压、投射光颜色和光电极形状对微粒运动速度的影响。实验结果表明,在交流电压频率和投射光颜色相同的条件下,粒子的运动速度与交流电压的幅值成线性关系,施加的交流电压幅值越大,微粒的运动速度越大。在交流电压的幅值和频率相同的条件下,投射光为白色时,粒子的运动速度最大;投射光为蓝色时,粒子的运动速度最小。当投射光为白光,电压为20V,频率为20kHz时,10μm和20μm聚苯乙烯微粒的最大运动速度分别为143μm/s和158μm/s。 相似文献
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Conventional approaches to control and shape the scattering pattems of light generated by different nanostructures are mostly based on engineering of their electric response due to the fact that most metallic nanostructures support only electric resonances in the optical frequency range. Recently, fuelled by the fast development in the fields of metamaterials and plasmonics, artificial optically-induced magnetic responses have been demonstrated for various nanostructures. This kind of response can be employed to provide an extra degree of freedom for the efficient control and shaping of the scattering patterns of nanoparticles and nanoantennas. Here we review the recent progress in this research direction of nanoparticle scattering shaping and control through the interference of both electric and optically-induced magnetic responses. We discuss the magnetic resonances supported by various structures in different spectral regimes, and then summarize the original results on the scattering shaping involving both electric and magnetic responses, based on the interference of both spectrally separated (with different resonant wavelengths) and overlapped dipoles (with the same resonant wavelength), and also other higher-order modes. Finally, we discuss the scattering control utilizing Fano resonances associated with the magnetic responses. 相似文献
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