| Abstract Scope |
In this study, 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). We use various process parameters, i.e., refractive index of photoresist, printing speed, power, exposure times, tailored to achieve printing precision. Post-printing, we utilize a chemical bath composed of propane-2-ol:4-methylpentan-2-one for part developing and assess printing quality using a scanning electron microscope (SEM). We then measure the radiative properties, i.e., absorptance, transmittance, and reflectance, of the sample using spectroscopy within the wavelength range of 350nm – 750nm. Its high throughput fabrication and minimal material waste make it ideal for diverse engineering applications. |