Articles techniques et présentations

Acoustophoresis is a promising technology for the downstream processing of microalgae biorefineries(Zhang et al., 2025). By generating acoustic radiation forces and acoustic streaming, it enables precise manipulation of particles within an acoustic standing field of a microfluidic chip ... En savoir plus

Additive manufacturing technology is becoming more popular for the fabrication of metal products as it offers rapid prototyping and large design freedom. However, part quality of components fabricated by current additive manufacturing technology is not comparable to that produced by ... En savoir plus

A well-collimated intensity profile at long distance has long been a desired laser property crucial for many potential applications. Extending a non-diverging range for ordinary laser beyond kilometers scale would permit superior performance for optical technologies, including LIDAR, or ... En savoir plus

Irradiation of various surface materials by ultra-short laser radiation, typically with pulse widths of 10-300 fs, results in the development of Laser-induced self-organized periodic surface structures (ripples). The periodicity of these structures ranges from the wavelength <em>λ ... En savoir plus

Time-dependent multiphysical simulation of pulsed and continuous laser welding of dissimilar metals, based on Moving Mesh (ALE) approach, is proposed. Strong coupling between heat transfer, laminar compressible flow and ALE is used. The model was validated for a case of single ... En savoir plus

设计了一种新型的介质激光波荡器。该设计的核心是一个周期性的介质结构，其两侧形成一个真空通道。通过引入两束特定波长的相向传播的平面激光波，在该真空通道内激励并产生一个相位同步的周期性电磁场。主要难点在于如何设计介质结构，使其在激光作用下，能够最大化提供偏转作用的横向电场Ey，同时必须将其他方向的场分量（如纵向场 Ez和加速场 Ex）对电子束的影响降至最低。 利用 COMSOL 求解了在两束相向传播的激光照射下，该周期性结构内部真空通道中的电磁场分布。通过仿真，验证即是否能成功在通道中心产生期望的周期性横向偏转电场，直观地展示电场沿不同方向的变化规律，从而评估波荡器的性能 ... En savoir plus

本文提出了一种新颖的介电激光加速器（DLA）结构，该结构利用三角梯度介电介质来增强逆切伦科夫效应（Inverse Cherenkov Effect, ICE），从而实现高梯度加速。逆切伦科夫效应是带电粒子从外部激光场中持续获取能量的过程，这在传统切伦科夫效应中是相反的，即粒子发射辐射。通过在介质中精确控制激光束的传播，可以产生一个与粒子速度同步的纵向电场分量，实现连续的净能量增益。为了验证这一概念并分析其性能，我们使用 COMSOL Multiphysics 进行了系统的仿真研究。仿真模型由一个位于自由空间域中的介电结构组成。我们应用散射边界条件（SBC ... En savoir plus

Additive manufacturing gathers technologies where near net shape components are produced by depositing successive layers of materials. Among these technologies, the Layer Beam Melting (LBM) process – often referred to as Selective Laser Melting (SLM) – is garnering industrial interest, ... En savoir plus

We present here the development of an optical human eye model – based on Ray Optics module in order to reproduce the eye optical properties. Current simulations in literature do not fully cover the light propagation inside all parts of the eye by taking into account the absorption but ... En savoir plus

Laser-induced forward transfer (LIFT) is a non-contact direct-write technique that enables the deposition of small volumes of material into user-defined high-resolution patterns with a wide range of structural and functional materials. There are many variations of the LIFT process, each ... En savoir plus