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Light has wave properties such as color (wavelength), intensity (amplitude) and the direction of oscillation (polarization). Lasers are the most uniform in quality across all of these properties, as compared with all other light sources. Kyoko has thus been interested in laser beams’ shape (intensity profiles) and polarizations. By controlling these characteristics, she has investigated how laser beams can generate smaller focal spot than its wavelength. Simultaneously, she has investigated how the focused beam has particular polarization: longitudinal polarization. Considering that general optical devices measure information which reach the detector after interaction between some object and focused light, she will further explore the nature of interaction between these objects and the novel focused beam. The aim is to advance the development of completely new optical devices.