Optogenetic neural probe device with plurality of inputs and outputs and method of manufacturing the same

An optogenetic neural probe device comprising:

• an optical device alignment substrate;
• an optical device group on the optical device alignment substrate, the optical device group comprising one or more optical devices;
• and
• one or more optogenetic neural probes, wherein each optogenetic neural probe from among the one or more optogenetic neural probes comprises an optical neural probe substrate, an optical waveguide on the optical neural probe substrate, and an optical signal input/output port,
• wherein the optogenetic neural probe is configured to transmit an optical signal emitted from the optical device group to the optical signal input/output port through the optical waveguide,
• wherein the optogenetic neural probe further comprises an optical mode size converter, the optical mode size converter being provided between at least one optical device of the optical device group and the optical waveguide, and
• wherein a cross-sectional area of the optical mode size converter decreases in a direction from the at least one optical device toward the optical signal input/output port.