| 摘要 |
PROBLEM TO BE SOLVED: To provide a performance-variable diffraction grating capable of varying a reflectance and a reflection wavelength band.SOLUTION: A performance-variable diffraction grating is formed on a deposit smoothly deposited on a substrate, and refraction liquid-charging grooves 12 and 13 having a width X, a length L and a depth d are formed in a part of the grating-formed substrate and a terrace part 11 having a width W is left therebetween. The refraction liquid-charging groove 13 having a periodic sawteeth shape enters parts of the terrace part 11. The refraction liquid charging grooves 12 and 13 can be charged with a liquid having an optional refractive index, and a reflectance and a reflection wavelength band being fundamental characteristics of the diffraction grating can be optionally varied by varying the refractive index of the liquid to be charged. |
