Ozcan Aydogan, Cubukcu Ertugrul, Bilenca Alberto, Crozier Kenneth B, Bouma Brett E, Capasso Federico, Tearney Guillermo J
Wellman Center for Photomedicine, Harvard Medical School, Boston, Massachusetts 02114, USA.
Nano Lett. 2006 Nov;6(11):2609-16. doi: 10.1021/nl062110v.
We theoretically and experimentally illustrate a new apertured near-field scanning optical microscopy (NSOM) technique, termed differential NSOM (DNSOM). It involves scanning a relatively large (e.g., 0.3-2 mum wide) rectangular aperture (or a detector) in the near-field of an object and recording detected power as a function of the scanning position. The image reconstruction is achieved by taking a two-dimensional derivative of the recorded power map. Unlike conventional apertured NSOM, the size of the rectangular aperture/detector does not determine the resolution in DNSOM; instead, the resolution is practically determined by the sharpness of the corners of the rectangular aperture/detector. Principles of DNSOM can also be extended to other aperture/detector geometries such as triangles and parallelograms.
我们在理论和实验上阐述了一种新的带孔近场扫描光学显微镜（NSOM）技术，称为差分NSOM（DNSOM）。它包括在物体的近场中扫描一个相对较大（例如，宽0.3 - 2微米）的矩形孔径（或探测器），并记录检测到的功率作为扫描位置的函数。通过对记录的功率图进行二维求导来实现图像重建。与传统的带孔NSOM不同，矩形孔径/探测器的尺寸在DNSOM中并不决定分辨率；相反，分辨率实际上由矩形孔径/探测器角的锐度决定。DNSOM的原理也可以扩展到其他孔径/探测器几何形状，如三角形和平行四边形。
