| 摘要 |
<p>A spectrometry apparatus includes a transmissive diffraction grating that transmits incident light. The transmissive diffraction grating has protrusions (110) with inclined surfaces (140) made of a first dielectric material. The inclined surfaces are so arranged that they are inclined to a reference line (130). When the angle of incidence of light incident on the transmissive diffraction grating is measured with respect to the reference line and defined as an angle ±, and the angle of diffraction of diffracted light is measured with respect to the reference line and defined as an angle ², the angle of incidence ± is smaller than a Bragg angle ¸ defined with respect to the inclined surfaces, and the angle of diffraction ² is greater than the Bragg angle ¸.</p> |
