Optical transmission structure and method for manufacturing the same, and optical transmission module

An optical transmission structure, comprising:

• a substrate comprising a plurality of through holes penetrating therethrough in a thickness direction thereof;
• a cladding member comprising an optical waveguide hole penetrating therethrough in the thickness direction and disposed inside at least one of the plurality of through holes;
• and
• a plurality of core members which are disposed inside the optical waveguide hole, and have a refractive index larger than the cladding member.

A method for manufacturing an optical transmission structure, comprising:

• preparing a substrate comprising a through hole penetrating therethrough in a thickness direction thereof;
• filling a photosensitive material into the through hole;
• exposing a region of the photosensitive material filled other than a region thereof in overlapping relation with a plurality of light-shielding portions to light through a light-transmitting plate comprising the plurality of light-shielding portions;
• removing the region of the photosensitive material in overlapping relation with the plurality of light-shielding portions;
• and
• filling a core member made of a light-transmitting material which has a refractive index larger than the photosensitive member exposed to light into an optical waveguide hole, the optical waveguide hole being formed by removing the photosensitive material and penetrating the photosensitive material in the thickness direction.

A method for manufacturing an optical transmission structure, comprising:

• preparing a substrate comprising a plurality of through holes penetrating therethrough in a thickness direction thereof;
• filling a photosensitive material into at least one of the plurality of through holes;
• exposing a region of the photosensitive material filled other than a region thereof in overlapping relation with the light-shielding portion to light through a light-transmitting plate comprising a light-shielding portion;
• forming the optical waveguide hole penetrating the photosensitive material in the thickness direction in the cladding member by removing the region of the photosensitive material in overlapping relation with the light-shielding portion;
• and
• filling a core member made of a light-transmitting material which has a refractive index larger than the photosensitive member exposed to light into the optical waveguide hole, the optical waveguide hole being formed by removing the photosensitive material and penetrating the photosensitive material in the thickness direction.