The revolutionary development of scanning probe microscopy has made the imaging of objects at molecular or atomic level possible. With the discoveries of new physical phenomena at low dimensions, the near field scanning optical microscope (NSOM) jointed the family after the scanning tunneling microscope (STM) and the atomic force microscope (AFM). Based on the common principles of non radiating field, NSOM opened the possibilities of ultra high optical resolution which overcomes the Rayleigh diffraction li...