Neutron-optical gratings from nanoparticle-polymer composites

Diffraction of slow neutrons by holographic SiO_2 nanoparticle-polymer composite gratings

Diffraction experiments with holographic gratings recorded in SiO$_2$ nanoparticle-polymer composites have been carried out with slow neutrons. The influence of parameters such as nanoparticle concentration, grating thickness and grating spacing on the neutron-optical properties of such materials has been tested. Decay of the grating structure along the sample depth due to disturbance of the recording process becomes an issue at grating thicknesses of about 100 microns and larger. This limits the achievable diffraction efficiency for neutrons. As a solution to this problem, the Pendellösung in…

具有极大中子散射长度密度调制幅度的全息超支化聚合物纳米复合光栅

Holographic hyperbranched polymer nanocomposite grating with exceptionally large neutron scattering length density modulation amplitudes

本文首次研究了含超支化聚合物纳米粒子的全息复合光栅的中子光学性质，在2 nm中子波长下测得迄今最高的中子散射长度密度调制幅度，并预测其可实现高效中子衍射。

Towards polarizing beam splitters for cold neutrons using superparamagnetic diffraction gratings

For holographic gratings recorded in superparamagnetic nanoparticle-polymer composites the diffraction efficiency should -- next to grating spacing, nanoparticle concentration and grating thickness -- depend on the strength of an external magnetic field and the incident neutron spin state. As a consequence, diffraction gratings should be tunable to act as mirrors for one spin state, while being essentially transparent for the other. Thus, polarizing beam splitters for cold neutrons become feasible.

A Scanning 2-Grating Free Electron Mach-Zehnder Interferometer

We demonstrate a 2-grating free electron Mach-Zehnder interferometer constructed in a transmission electron microscope. A symmetric binary phase grating and condenser lens system forms two spatially separated, focused probes at the sample which can be scanned while maintaining alignment. The two paths interfere at a second grating, creating in constructive or destructive interference in output beams. This interferometer has many notable features: positionable probe beams, large path separations relative to beam width, continuously tunable relative phase between paths, and real-time phase infor…

关于负载致密纳米颗粒的聚合物复合闪烁体光产额增强的起源

On the origin of the light yield enhancement in polymeric composite scintillators loaded with dense nanoparticles

本文研究负载致密HfO2纳米颗粒的聚合物复合闪烁体，发现其闪烁产额提升100%且时间响应不变，并首次将该增强归因于NPs在电离辐射作用下对发射态产生的局部效应。

聚合物纳米复合材料的3D原子级成像：原子探针显微术的实验方法、初步结果与未来展望

3D atomistic imaging of polymer nanocomposites with Atom Probe Tomography: experimental methodology, preliminary results and future outlook

本研究首次应用原子探针显微术对聚合物纳米复合材料进行3D原子级成像，探讨了实验方法、初步结果及未来发展方向。