Articles techniques et présentations

Synthetic jet actuators enhance flow control by generating pulsatile jets with zero net mass flux. There is a need to develop a computationally inexpensive model that can generate optimal geometric actuator designs of maximum jet performance. This work investigates the multi-physics ... 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

Germanium-tin (Ge₁₋ₓSnₓ) microdisks are emerging as a promising platform for CMOS-compatible group-IV light sources due to their tunable direct bandgap and compatibility with silicon photonics. Their optical and electronic properties are critically influenced by tin concentration, strain ... En savoir plus

Surface plasmons in metal rectangular gratings can form bands and band gaps in their dispersion relations, analogous to those in photonic band-gap crystals and electronic bands in semiconductors. Introducing a dielectric coating atop the metal redshifts the plasmonic band gap, enabling a ... 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

The Finite Element Method (FEM) has become an established numerical tool used for different academic and industrial purposes. It allows the prediction of weld pool geometry, thermal cycle, final distortion and residual stress field during and after fusion welding. The capability of the ... En savoir plus

This work investigates the ablation of a copper surface caused by the irradiation of a 220 ns laser pulse. Our focus is on the heat transport within the copper and takes the proceeding vaporization of surface substance into account. Our model ignores plasma dynamics and simulates the ... 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