Light splitting device and method for manufacturing the same, method for dispersing light, and spectrometer

A method for manufacturing a light splitting device, comprising:

• forming a first light-transparent layer;
• forming an optical waveguide body;
• forming a dispersion grating, wherein the optical waveguide body is configured to transmit incident light to the dispersion grating, the dispersion grating is configured to disperse the incident light transmitted by the optical waveguide body into a plurality of spectral lines, and the optical waveguide body is further configured to change propagation directions of the plurality of spectral lines and to emit the plurality of spectral lines;
• and a refractive index of a material for the first light-transparent layer is less than both a refractive index of a material for the optical waveguide body and a refractive index of a material for the dispersion grating;
• and
• forming a second light-transparent layer, wherein the second light-transparent layer is opposite to the first light-transparent layer;
• both the optical waveguide body and the dispersion grating are disposed between the first light-transparent layer and the second light-transparent layer;
• and a refractive index of a material for the second light-transparent layer is less than both the refractive index of the material for the optical waveguide body and the refractive index of the material for the dispersion grating, wherein
• the optical waveguide body includes a Dove prism, and the dispersion grating includes an arrayed waveguide;
• and forming the optical waveguide body and forming the dispersion grating, includes:
• forming a waveguide layer on a surface of the first light-transparent layer, wherein a refractive index of a material for the waveguide layer is greater than the refractive index of the material for the first light-transparent layer;
• and
• forming, by using the waveguide layer, a Dove prism, and an input waveguide, an arrayed waveguide and an array of output waveguides all directly disposed in a top surface of the Dove prism;
• wherein the Dove prism includes an incident slope and an exit slope, the incident slope is configured to reflect the incident light irradiated into the Dove prism and to supply the reflected incident light to the input waveguide, the input waveguide is configured to supply received incident light to the arrayed waveguide, the array of output waveguides is configured to guide the plurality of spectral lines and to supply the plurality of spectral lines to the exit slope, and the exit slope is configured to reflect the plurality of spectral lines and to derive the plurality of spectral lines from the Dove prism.

A light splitting device, comprising:

• an optical waveguide body, a dispersion grating, and a first light-transparent layer and a second light-transparent layer that are opposite to each other, wherein
• the optical waveguide body and the dispersion grating are disposed between the first light-transparent layer and the second light-transparent layer;
• the optical waveguide body is configured to transmit incident light to the dispersion grating, the dispersion grating is configured to disperse the incident light transmitted by the optical waveguide body into a plurality of spectral lines, and the optical waveguide body is further configured to change propagation directions of the plurality of spectral lines and to emit the plurality of spectral lines;
• and
• a refractive index of a material for the optical waveguide body and a refractive index of a material for the dispersion grating are both greater than a refractive index of a material for the first light-transparent layer and are both greater than a refractive index of a material for the second light-transparent layer, wherein
• the optical waveguide body includes:
• an input waveguide, an array of output waveguides, a reflecting structure and a plurality of diffraction gratings;
• and the dispersion grating includes a concave grating;
• both the input waveguide and the array of output waveguides are disposed at a concave surface of the concave grating;
• the array of output waveguides includes a plurality of guiding waveguides;
• the plurality of guiding waveguides are in one-to-one correspondence to a plurality of light focusing points on a Rowland circle of the concave grating;
• the reflecting structure is configured to reflect received incident light and to supply the reflected incident light to the input waveguide;
• the input waveguide is configured to supply the received incident light to the concave grating;
• the concave grating is configured to diffract the received incident light into a plurality of spectral lines and to make each of the plurality of spectral lines be focused on a corresponding light focusing point;
• each of the plurality of guiding waveguides is configured to transmit a corresponding spectral line to a corresponding diffraction grating;
• and
• each of the plurality of diffraction gratings is configured to control a corresponding spectral line to emit from the first light-transparent layer.