Low refractive index resin composition for tpp nano 3d printing and photonic wire bonding method using the same

A two photon polymerization (TPP) reaction-based photonic wire bonding (PWB) method of forming an optical waveguide connecting between optical elements mounted on a circuit board using a TPP reaction, the TPP reaction-based PWB method comprising:

• forming a lower cladding fixing a connection portion with optical elements while guiding an area to be printed with an optical waveguide core connected between the optical elements by applying a low refractive index resin composition for TPP reaction between the optical elements mounted on the circuit board and then selectively curing the resin composition through light irradiation using a 3D nanoprinter;
• after the formation of the lower cladding is completed, printing the optical waveguide core on an upper portion of the lower cladding by removing the applied low refractive index resin composition by washing, applying a high refractive index resin for the optical waveguide core, and then selectively curing the high refractive index resin through the light irradiation using the 3D nanoprinter;
• and
• after the printing of the optical waveguide core is completed, forming an upper cladding on the upper portion of the lower cladding and the optical waveguide core by removing the applied high refractive resin by the washing, and applying the low refractive index resin composition for TPP reaction again, and then selectively curing the resin composition through the light irradiation using the 3D nanoprinter.