17. COSATI COOES 18. SUBJECT TERMS (Continue on reverse if necesary and identify by block number) FIELO GROUP SUB. GR. 19. ABSTRAC (Continue on reverse if neceary and identify by block number) t the start of the present contract we had only a rudimentary understanding of the nature of the near~field. As a result of this contract, great progress has been mad both in building a theoretical foundation and underpinning this foundation with crucial experiments. The fundamental principale underlying the NSOM concept is outlined in Figure 1, where visible light is depicted as being normally incident on a conducting screen containing a small (sub-wavelength) aperture. Because the screen is completely opaque, the radiation emanating through the aperture and into the region beyond the screen is first collimated to the aperture size rathe
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