期刊
出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2019.07.019
关键词
photonic nanojet; FDTD simulation; Gaussian beam; Radially polarized beam
类别
资金
- JSPS KAKENHI [18J10140]
- Grants-in-Aid for Scientific Research [18J10140] Funding Source: KAKEN
A photonic nanojet (PNJ) is a fine light beam generated from a dielectric microsphere or microcylinder illuminated by a laser and has been applied to nanometer scale measurement and machining. In this study, we attempt to control the PNJ intensity distribution flexibly by adjusting the intensity distribution of two incident laser beams: a Gaussian beam and a radially polarized beam. Then, finite-difference time-domain simulations demonstrated that a large PNJ beam diameter (1.08A) could be obtained by Gaussian beam with a small beam radius, whereas a small PNJ beam diameter (0.34A) could be obtained by radially polarized beam. Moreover, PNJ with isotropic intensity distribution can be obtained as well as a small PNJ beam diameter by a radially polarized beam incidence to a microsphere.
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