| Abstract Scope |
We use an ultra-high-resolution micro-fabrication of porous media using two-photon polymerization (TPP) direct green laser writing maskless technology. By precisely controlling sub-nanosecond laser pulses and nonlinear laser-polymer interactions, TPP generates ultra-narrow, reproducible voxels, enabling sub-micron resolution by achieving feature sizes below the diffraction limit of light without the layer-by-layer limitations of traditional AM methods. We perform 3D printing using an inverted optical microscope (20X, 40X lens) and use process parameters, i.e., refractive index of photoresist, printing speed, power, and exposure times, tailored to achieve printing precision. Post-printing, we utilize a chemical bath composed of (propane-2-ol:4-methylpentan-2-one) to develop and assess printing quality using SEM images. We then measure the radiative properties, i.e., absorptance, transmittance, and reflectance, of the sample using a Micro-Spectrophotometer within the wavelength range of 350nm – 750nm. Its high throughput fabrication and minimal material waste make it ideal for diverse engineering applications e.g., micro-optics-photonics, next-generation-solar-cells, meta-materials. |