NTUA participated at SPIE Photonics West 2024 in San Francisco, California (USA)

From 27 January to 1 February, Prof. Ioanna Zergioti and Dr. Marina Makrygianni, from the National Technical University of Athens, participated in the SPIE Photonics West 2024, The world’s premier event for lasers, biomedical optics and biophotonic technologies, quantum, and optoelectronics, which took place in San Francisco, California (USA)

The conference included multiple symposia and technical sessions covering areas such as biomedical optics, photonics, lasers, optoelectronics, micro/nano fabrication, and more. It provided a platform for researchers, engineers, scientists, and industry professionals to share and discuss the latest advancements in photonics research, technology, and applications. It also featured an exhibition showcasing the latest products and innovations in the field.

Dr. Marina Makrygianni had the chance to present, on 30 January 2024, Project MatEl’s latest results on the “Study of Laser-Based transfer of Graphene via Laser Induced Transfer processes for the On-Chip Integration of Photodetector”. Below you can find the abstract of the presentation:

Currently the most widely graphene production technique is growth via Chemical Vapor Deposition (CVD) on copper thin films previously deposited by evaporation on sapphire substrates, which can yield high-quality monolayer graphene coatings. However, the transfer of graphene from the growth substrate via conventional methods making use of support/protective layers (e.g., organic polymers), lithographic masking layers and chemical etching, is a multi-step complex procedure. Here, we report the use of laser-based transfer technique, namely, Laser-Induced Forward Transfer (LIFT) for the reliable, reproducible and high-quality transfer of graphene pixels at designated areas on SiO₂/Si substrates, directly from the growth substrate. LIFT is an environmentally friendly, mask-less technique and offers high resolution with high throughput. The quality of the transferred films has been inspected via SEM, Raman spectroscopy, and AFM characterization. Electrical characterization for mobility measurement will also be performed. The aim of this study is the process optimization of LIFT process parameters, such as the laser fluence. The reported results highlight the advantages of the laser-based monolayer graphene deposition methods for the on-chip integration of graphene-based photodetectors.

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