A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength
Using the fact that a sub-wavelength structure exhibits the same thermal expansion coefficient as a micro-lens array, we design a micro-lens super-surface film with regular circular hole-like subwavelength structures to realize the high performances of central highly focusing strength and short foca...
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doaj-7c6fcdcb04c04822821bdaf3ece163dc2020-11-24T21:50:05ZengMDPI AGCoatings2079-64122019-11-0191277610.3390/coatings9120776coatings9120776A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing StrengthJinshuang Wu0Leimengting Zhang1Yahong Li2Yixin Zhang3Bowei Yang4Yuegang Fu5Key Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology, Changchun University of Science and Technology, Changchun 130022, ChinaKey Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology, Changchun University of Science and Technology, Changchun 130022, ChinaCollege of Mechanical Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology, Changchun University of Science and Technology, Changchun 130022, ChinaKey Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology, Changchun University of Science and Technology, Changchun 130022, ChinaKey Laboratory of Opto-electronic Measurement and Optical Information Transmission Technology, Changchun University of Science and Technology, Changchun 130022, ChinaUsing the fact that a sub-wavelength structure exhibits the same thermal expansion coefficient as a micro-lens array, we design a micro-lens super-surface film with regular circular hole-like subwavelength structures to realize the high performances of central highly focusing strength and short focal length. In addition, based on the Fresnel—Kirchhoff diffraction theory, the influences of subwavelength structural period and height on the focusing performance of a micro-lens are analyzed. Furthermore, the finite-difference time-domain method is utilized to optimize the structural parameters. Via direct laser writing and an inductively coupled plasma process, we fabricated a square micro-lens array consisting of a 1000 × 1000 micro-lens unit with a sub-wavelength structure, and the optical focusing performance was measured in the visible light band. Finally, the experimental results indicate that the focal length is decreased to 15 μm, the focal spot central energy is increased by 7.3%, and the light transmission, enhanced via inserting sub-wavelength structures, corresponds to 3%. This proves that the designed micro-lens array with a regular-graded circular hole-like subwavelength structure can achieve central high focusing and a short focal length. This has applications in several fields of wavefront detection and light field imaging systems.https://www.mdpi.com/2079-6412/9/12/776subwavelength structuremicro-lens arrayfinite-difference time-domaintransmission-enhancedwavefront detection |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jinshuang Wu Leimengting Zhang Yahong Li Yixin Zhang Bowei Yang Yuegang Fu |
spellingShingle |
Jinshuang Wu Leimengting Zhang Yahong Li Yixin Zhang Bowei Yang Yuegang Fu A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength Coatings subwavelength structure micro-lens array finite-difference time-domain transmission-enhanced wavefront detection |
author_facet |
Jinshuang Wu Leimengting Zhang Yahong Li Yixin Zhang Bowei Yang Yuegang Fu |
author_sort |
Jinshuang Wu |
title |
A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength |
title_short |
A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength |
title_full |
A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength |
title_fullStr |
A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength |
title_full_unstemmed |
A Microlens Super-Surface Film with Regular Graded Circular Hole-Like Subwavelength Structures for Highly Focusing Strength |
title_sort |
microlens super-surface film with regular graded circular hole-like subwavelength structures for highly focusing strength |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2019-11-01 |
description |
Using the fact that a sub-wavelength structure exhibits the same thermal expansion coefficient as a micro-lens array, we design a micro-lens super-surface film with regular circular hole-like subwavelength structures to realize the high performances of central highly focusing strength and short focal length. In addition, based on the Fresnel—Kirchhoff diffraction theory, the influences of subwavelength structural period and height on the focusing performance of a micro-lens are analyzed. Furthermore, the finite-difference time-domain method is utilized to optimize the structural parameters. Via direct laser writing and an inductively coupled plasma process, we fabricated a square micro-lens array consisting of a 1000 × 1000 micro-lens unit with a sub-wavelength structure, and the optical focusing performance was measured in the visible light band. Finally, the experimental results indicate that the focal length is decreased to 15 μm, the focal spot central energy is increased by 7.3%, and the light transmission, enhanced via inserting sub-wavelength structures, corresponds to 3%. This proves that the designed micro-lens array with a regular-graded circular hole-like subwavelength structure can achieve central high focusing and a short focal length. This has applications in several fields of wavefront detection and light field imaging systems. |
topic |
subwavelength structure micro-lens array finite-difference time-domain transmission-enhanced wavefront detection |
url |
https://www.mdpi.com/2079-6412/9/12/776 |
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