带铬环的幅带板对圆偏振激光的紧密聚焦

Q2 Social Sciences

Advances in Engineering Education Pub Date : 2017-11-01 DOI:10.1109/PIERS-FALL.2017.8293557

V. Kotlyar, S. Stafeev, A. Nalimov, M. Kotlyar, L. O’Faolain, E. Kozlova

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引用次数: 0

摘要

利用近场扫描显微镜，我们证明了在玻璃衬底上溅射的70 nm铬膜上制作15 μm带板，其焦距和最外层带宽度等于入射波长λ = 532 nm，可以将圆偏振高斯光束聚焦到圆形亚波长焦斑上，该焦斑在半最大强度全宽度处的直径为FWHM = 0.47λ。这个值与fdtd辅助的FWHM = 0.46λ的数值估计接近准确。

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Tight focusing of circularly polarized laser light by amplitude zone plate with chromium rings

Using near-field scanning microscopy, we demonstrate that a 15-μm zone plate fabricated in a 70-nm chromium film sputtered on a glass substrate and having a focal length and outermost zone's width equal to the incident wavelength λ = 532 nm, focuses a circularly polarized Gaussian beam into a circular subwavelength focal spot whose diameter at the full-width of half-maximum intensity is FWHM = 0.47λ. This value is in near-accurate agreement with the FDTD-aided numerical estimate of FWHM = 0.46λ.

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来源期刊

Advances in Engineering Education Social Sciences-Education

CiteScore

2.90

自引率

0.00%

发文量

期刊介绍： The journal publishes articles on a wide variety of topics related to documented advances in engineering education practice. Topics may include but are not limited to innovations in course and curriculum design, teaching, and assessment both within and outside of the classroom that have led to improved student learning.