ONF could excite the interband transitions between different wave -vectors according to the uncertainty principle. .
The size of the devices has been reduced to a nano-meter scale to meet the requirement using “nanotechnology“. Optical near-field (ONF) has made it possible to reduce the size of photonic devices to the sub-wavelength scale or smaller. For further development of photonics we are interested in using the unique properties of ONF, which originated from the non-uniformity of the electric and/or magnetic field in a nano-scale. Using the ONF, we realized unconventional photo-reaction, resulting in the nano-scale device and sub-nanometer scale fabrication process.