Color optical switching device

摘要

An optical switching element includes a resonant reflection element (11) and a driving unit (12, 14). The resonant reflection element (11) has a thickness portion functioning as a waveguide layer, with one surface in a thickness direction functioning as a total reflection surface and the other surface having formed thereon a fine periodic structure with fine asperities, the resonant reflection element resonant-reflecting light that is incident from the other surface and has a specific wavelength component. The driving unit (12, 14) varies a resonant wavelength of resonant refection by varying at least one of a shape and a refractive index of the resonant reflection element (11).