| 摘要 |
A multilayer minus filter for reflecting a light having a predetermined wavelength and transmitting a light having a wavelength longer than and shorter than the predetermined wavelength, includes a repetition layer such that a sum of an average value of optical thickness of a high refractive index layer and an average value of optical thickness of a low refractive index layer is substantially equal to a reflection wavelength lambda0 with respect to a vertically incident light, wherein, when a rate H/L between the optical thickness H of the high reflective index layer and the optical thickness L of the low reflective index layer in the repetition layer of the high refractive index layer and the low refractive index layer is larger than 0.5 and smaller than 2, a reflection band formed in the reflection wavelength lambda0 by the repetition layer is utilized.
|
