Design of a Fourier transform micro-spectrometer by means of thermally actuated grating light valve in a waveguide structure

摘要

By locating several rectangular holes, a grating can be made in a waveguide. The holes are filled with a liquid with high depends of refractive index to temperature. By changing temperature by applying current to a thin-film heater, the efficiency and the Oth order of diffraction which is coupled into the output port is changed. Fourier transform of the output intensity, shows the spectrum of the input light.