Nanophotonics-based optical devices have a potential for wide variety of applications. For example, in next generation hard disk drives, a flying recording head with a nano-optical transducer creates a tiny near-field optical spot inside a magnetic recording medium which enables a higher data capacity per recording disk. As the example indicates, the “near-field” is a major application area for the nanophotonics devices. As one possible approach to apply them beyond the near-field, recently we demonstrated an array of photo electron transducer by using a novel C-shaped metallic nano aperture. The transducer creates sub-20 nm optical spots; then, the optical spots are converted to sub-20 nm electron sources. Such opt-electron combined imaging systems potentially break the near-field limitation by an aide of electron imaging optics. In the talk, we will describe operational principle and fabrication of the C-shaped nano aperture, experimental results on optical spot size and future applications.