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首页> 外文期刊>Photonics and Nanostructures: Fundamentals and Applications >Optical shaping of surface metal microstructures via nondiffracting beam controlled atomic deposition
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Optical shaping of surface metal microstructures via nondiffracting beam controlled atomic deposition

机译：通过非裂解光束控制原子沉积的表面金属微观结构的光学整形

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The first experimental realization of the non-diffracting Bessel beam technique for micro-structuring of thin rubidium metallic films on the sapphire surface is reported. Rubidium atoms were deposited onto the cool sapphire windows from the heated central region of the evacuated cell under simultaneous illumination by a Bessel beam at 532 nm wavelength and 4.5 W/cm(2) intensity. The approach of the optically controlled atomic deposition is based on the strong non-thermal photo-desorption of atoms from illuminated areas of dielectric surface diminishing the surface density of adsorbed atoms below the threshold of nucleation process, while in the dark areas concentration of adsorbed atoms exceeds the critical value and a metal film starts to grow. As a result, the annular Bessel beam optical pattern with 40 mu m periodicity was reproduced with high contrast in the Rb deposits, thus creating the annularly micro-structured metal film on the sapphire surface. The diffraction efficiency of the metal grating with the estimated thickness of similar to 40 nm was measured to be about 1.8%.
机译：报道了在蓝宝石表面上的薄铷金属膜微结构的非衍射贝塞尔光束技术的第一次实验实现。通过在532nm波长和4.5W / cm（2）强度的4.5W / cm（2）强度的贝塞尔光束的同时照射下，将铷原子从抽空电池的加热中心区域沉积在凉爽的蓝宝石窗口上。光学控制的原子沉积的方法是基于来自介电表面的照明区域的原子强的非热光光吸附，在核切割过程的阈值下减小吸附原子的表面密度，而在吸附原子的暗区浓度下超过临界值，金属膜开始生长。结果，以40μm周期性的环形贝塞尔光束光学图案以高对比度再现在RB沉积中，从而在蓝宝石表面上产生环形微结构化金属膜。测量厚度与40nm相似的金属光栅的衍射效率为约1.8％。

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