MONDAL Ayan : Micro-nano 3D Printing of Multimaterial structures based on doped silica glass and metal

Résumé de thèse :

Additive manufacturing or 3D printing has emerged recently as a powerful tool for constructing 3D structures at micro and nano scales [1]. Employing the process of two-photon polymerization, this powerful process enables the layer-by-layer addition of new materials on substrates or at the end of fibers, facilitating the realization of complex designs such as optical sensors and photonic integrated circuits. My thesis work focuses on the production optical components at the end of fibers using photoresists containing polymers and doped silica by Microlight and Nanoscribe 3D printers [2]. Preliminary experiments have yielded promising results, including the successful printing of different kinds of Fabry-Perot sensors utilizing polymers (IP-S) and silica sol-gel (1:1). The main issue is in this first step to demonstrate all the powerful advantages of using silica instead of polymers especially on the ageing of the components. The structures with the polymers have undergone sintering at temperatures approximately 80°C, with ensuing data analysis revealing evolutions of the optical characteristics meanwhile silica FP sensors support temperature as high as 1000°C. Looking ahead, our objectives extend to the fabrication of Fiber Bragg Gratings (FBGs) at the end of the fiber with the photoresists. For now, I have developed a numerical model of an FBG utilizing Finite Difference Time Domain (FDTD) software, MEEP and would like to compare the results with a mode coupling theory. In the poster presentation, I will showcase both our theoretical framework and experimental findings, highlighting the potential of 3D printing in advancing micro-nano optics.