Our laboratory is at the forefront of developing a novel 3D printing technique that enables the fabrication of complex materials within transparent, porous substrates. This innovative approach facilitates the creation of advanced photonic structures with wide-ranging applications in energy conversion, optical sensing, and related technologies. By precisely tuning the porosity and composition of the host substrate, we can tailor the optical characteristics of the printed materials, thereby unlocking new pathways for designing and optimizing photonic devices. Our overarching goal is to leverage this technique to produce materials that not only redefine the limits of photonic performance but also introduce enhanced functionalities and greater efficiencies in light manipulation and energy transformation.