Monochromatic X-ray Source Based on Scattering from a Magnetic Nanoundulator.,ACS Photonics

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Monochromatic X-ray Source Based on Scattering from a Magnetic Nanoundulator.
ACS Photonics ( IF 6.5 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsphotonics.0c00121
Sophie Fisher ₁ , Charles Roques-Carmes ₂ , Nicholas Rivera ₁ , Liang Jie Wong _{3,

4} , Ido Kaminer ₅ , Marin Soljačić ₁

Affiliation

We present a novel design for an ultracompact, passive light source capable of generating ultraviolet and X-ray radiation, based on the interaction of free electrons with the magnetic near-field of a ferromagnet. Our design is motivated by recent advances in the fabrication of nanostructures, which allow the confinement of large magnetic fields at the surface of ferromagnetic nanogratings. Using ab initio simulations and a complementary analytical theory, we show that highly directional, tunable, monochromatic radiation at high frequencies could be produced from relatively low-energy electrons within a tabletop design. The output frequency is tunable in the extreme ultraviolet to hard X-ray range via electron kinetic energies from 1 keV to 5 MeV and nanograting periods from 1 μm to 5 nm. The proposed radiation source can achieve the tunability and monochromaticity of current free-electron-driven sources (free-electron lasers, synchrotrons, and laser-driven undulators), yet with a significantly reduced scale, cost, and complexity. Our design could help realize the next generation of tabletop or on-chip X-ray sources.

中文翻译：

基于磁性纳米分离器散射的单色X射线源。

我们基于自由电子与铁磁体的磁场近场的相互作用，提出了一种能够产生紫外线和X射线辐射的超紧凑型无源光源的新颖设计。我们的设计受到纳米结构制造的最新进展的启发，纳米结构的制造允许将大磁场限制在铁磁纳米光栅的表面。使用从头算模拟和互补的分析理论，我们表明，在台式设计中，可以从相对低能的电子中产生高方向性，可调谐，单色的高频辐射。通过从1 keV到5 MeV的电子动能和从1μm到5 nm的纳米光栅周期，输出频率可在极紫外至硬X射线范围内调节。所提出的辐射源可以实现电流自由电子驱动源（自由电子激光器，同步加速器和激光驱动波荡器）的可调谐性和单色性，而规模，成本和复杂性却大大降低。我们的设计可以帮助实现下一代台式或片上X射线源。

更新日期：2020-04-01

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