Femtosecond laser-treated SiO2 nanocomposites for EMI shielding and preserved optical transparency

Abstract

This study advances glass nanocomposite research by achieving exceptional Electromagnetic Interference (EMI) shielding while maintaining optical transparency. We employ femtosecond laser engraving and thermal vapor deposition to create precise periodic line patterns on fused quartz glass, which serve as a framework for the controlled deposition of silver (Ag) and gold (Au) nanoparticles through laser-ablated micro-channels. These nanocomposites effectively balance EMI shielding and optical transmittance, making them suitable for applications in electronics, aerospace, and telecommunications. Femtosecond laser ablation allows for meticulous glass surface modification. Using an XY motorized translation stage guided by a photoresist, we form line patterns with spacings of 200, 400, and 600 µ-meter, resulting in Shielding Effectiveness (SE) in the range of 10–37 dB. Notably, despite substantial modification, the glass nanocomposites retain optical transmittance comparable to clear glass, enhancing their utility in applications where visual clarity is essential, such as windows, displays, and security infrastructure. By integrating femtosecond laser ablation with controlled thermal deposition, we produce multifunctional glass nanocomposites that offer promising EMI shielding and optical transparency, paving the way for advanced materials in industries where both properties are critical.