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首页> 外文会议>Conference on Laser-Assisted Micro- and Nanotechnologies 2003; Jun 29-Jul 3, 2003; St. Petersburg, Russia >SNOM investigation of the electromagnetic field intensity and polarization distribution in the vicinity of subwavelength structures
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SNOM investigation of the electromagnetic field intensity and polarization distribution in the vicinity of subwavelength structures

机译：SNOM研究亚波长结构附近的电磁场强度和极化分布

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摘要

Experimental and calculated results of the investigation of electromagnetic field distribution including its polarization characteristics in the vicinity of the structures with subwavelength sizes are presented. The experimental investigation was realized by aperture type scanning near field optical microscope, which operated in collection mode and provided both high spatial resolution and large scanning range. Shear force detection was used for the control of aperture to surface gap. Normal resolution, which allows us to image down to 0.3 nm height surface steps, was demonstrated for this gap control system. Theoretical computation of electromagnetic field distribution was realized by finite-difference time-domain (FDTD) method. Experimental three-dimensional maps of intensity and polarization distribution as a result of light diffraction at subwavelength aperture in metal screen, dielectric and metallized subwavelength cylinders were obtained. The qualitative difference between the orthogonal polarized component distributions near subwavelength aperture in aluminium screen was experimentally shown. The electromagnetic field concentration in the proximity of the dielectric nanocylinders was observed. This observation gives good fit with the results of FDTD computations. A spiral type electromagnetic field distribution pattern was experimentally observed in the proximity of metallized subwavelength cylinders, which is unexpected from both experimental and theoretical points of view.
机译：给出了研究电磁场分布的实验和计算结果，包括在亚波长尺寸结构附近的极化特性。实验研究是通过光圈式扫描近场光学显微镜实现的，该显微镜在采集模式下工作，具有很高的空间分辨率和较大的扫描范围。剪切力检测用于控制孔径到表面间隙。此间隙控制系统证明了正常分辨率，该分辨率可使我们成像至0.3 nm高的表面台阶。通过时域有限差分法（FDTD）实现了电磁场分布的理论计算。获得了在金属屏，电介质和金属化亚波长圆柱体中亚波长孔处光衍射的强度和偏振分布的实验三维图。实验表明了铝屏中亚波长孔径附近正交偏振分量分布之间的质量差异。观察到电介质纳米圆柱体附近的电磁场浓度。该观察结果与FDTD计算的结果非常吻合。在金属化的亚波长圆柱体附近实验观察到螺旋型电磁场分布模式，这从实验和理论角度都是出乎意料的。

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