Conference Agenda

There are many fields, such as microfluidics and Organ-on-a-chip technologies, where an optimal setting and control of temperature is necessary. These fields are reaching the forefront of personalised medicine, thus requiring developing more complex systems to adequately mimic any biological condition. On this work we propose the design and fabrication of a microfluidic chip mixing Polydimethylsiloxane (PDMS) and magnetic nanoparticles (MNPs) to obtain a device whose temperature could be adjusted by means of magnetic hyperthermia. Characterization of the device was performed with confocal microscopy and microcomputed tomography (micro-CT). Magnetic hyperthermia was employed to estimate the heating curve of the devices and Computational Fluid Dynamics (CFD) simulations enabled to analyse the heat distribution within the device when introducing flow.

Differential Absorption Lidar (DiAL) method is widely used for a number of ground-based and airborne greenhouse gas measurement applications. However, for a direct detection in the 2µm range, other sources of random noise can be neglected in front of the detection noise which increases with ranging. We therefore propose to evaluate the effect of non-constant Scheimpflug-like averaging to reduce the signal-to-noise ratio along the line of sight, during a 5-hour measurement campaign in the Paris region.

This work describes the development and testing of a diagnostic technique, based on a robust setup named Point Diffraction Interferometer, to characterize the wavefronts generated by metalenses. The presented optical setup is simple, cheap and insensitive to mechanical disturbances, nevertheless precisely capable to reconstruct the radiation wavefront produced by a metalens. The obtained interference patterns exhibit suitable contrast ratio of the fringes and high spatial resolution, thus allowing the detection of even highly distorted wavefronts, and providing a measurable information about the metalens properties.

To improve the efficiency of lens blocking for grinding and polishing, plaster use was studied in the work herein reported.The dimensional stability, low thermal expansion, shapability, and cost-effectiveness of plaster can contribute to the production of high-quality optical lenses. These results foster advancements in optical manufacturing, enhancing the simultaneous processing of multiple lenses or prisms.

The further development of optical lens production is a continuous optimisation process to improve results and shorten processing times. One approach to this is the adaptation of CNC programmes to produce rotationally symmetrical spherical lenses, as well as processing with additive manufactured tools as an ultra-fine grinding step. This can enable high surface qualities with Rq roughness around 100 nm and lower.

This study approaches to turn subjective influencing factors of CNC polishing into more deterministic ones by using cerium oxide foils in a similar way to CNC grinding tools. Due to the high cerium oxide concentration of those foils, coolant lubrication is sufficient without the need of a polishing slurry, enabling polishing processes on CNC grinding machines. A surface roughness Sq ≤ 50nm could be achieved.