Abstract
A method is described to design a microstructure comprised of multi-Fresnel zone plate (FZP) fragments for shaping an optical needle with arbitrary length. Thus, a microstructure comprised of three planar FZP fragments with different focal lengths f1, f2, and f3 is designed to form a long optical needle by delicate interference of coherent light beams diffracted from these three FZP fragments. For a 74.34-μm-diameter microstructure illuminated with a linearly x-polarized beam, a 7.87-λ-long optical needle is produced at a distance of 12.31 λ away from the mask surface. The sizes of transverse beam are 0.97 and 0.4 λ in x and y directions, respectively. For this work, the vectorial angular spectrum (VAS) theory is employed to describe the electric field of light behind the microstructure, as well as the three-dimensional finite-difference time-domain (3D FDTD) method is adopted to further verify the results obtained.
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Funding
This work is supported by the National Key R&D Program of China (grant number 2017YFB1104700), the National Science Fund for Excellent Young Scholars (No. 51722509), the National Natural Science Foundation of China (NSFC) (grant numbers 51575440, 61505158), the 13th Five-Year Equipment Pre-research Development Project (61404140203), Shaanxi Industrial Science and Technology Key Project (No.2016GY-011), and the Young Elite Scientists Sponsorship Program by CAST (grant number 2015QNRC001).
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Liu, Q., Liu, T., Yang, S. et al. A new method to produce optical nano-needle. Int J Adv Manuf Technol 104, 27–32 (2019). https://doi.org/10.1007/s00170-018-1827-y
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DOI: https://doi.org/10.1007/s00170-018-1827-y