Journal ArticleDOI
Rapid fabrication of large-area concave microlens arrays on PDMS by a femtosecond laser.
Jiale Yong,Feng Chen,Qing Yang,Guangqing Du,Hao Bian,Dongshi Zhang,Jinhai Si,Feng Yun,Xun Hou +8 more
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TLDR
It is shown that uniform microlenses with different diameters and depths can be controlled by adjusting the power of laser pulses, which greatly enhances the processing efficiency compared to the classical laser direct writing method.Abstract:
A fast and single-step process is developed for the fabrication of low-cost, high-quality, and large-area concave microlens arrays (MLAs) by the high-speed line-scanning of femtosecond laser pulses. Each concave microlens can be generated by a single laser pulse, and over 2.78 million microlenses were fabricated on a 2 × 2 cm2 polydimethylsiloxane (PDMS) sheet within 50 min, which greatly enhances the processing efficiency compared to the classical laser direct writing method. The mechanical pressure induced by the expansion of the laser-induced plasmas as well as a long resolidifing time is the reason for the formation of smooth concave spherical microstructures. We show that uniform microlenses with different diameters and depths can be controlled by adjusting the power of laser pulses. Their high-quality optical performance is also demonstrated in this work.read more
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Proceedings ArticleDOI
Analysis of diffraction properties of micro-lens array (MLA) engraved optical fibers for biomedical applications
Rabita Hasan,Md. Shamim Ahsan +1 more
TL;DR: In this paper, a design concept and simulation results of concave micro-lens array (MLA) engraved optical fibers are presented. And the simulation results show that the MLA engraved optical fiber will be able to provide improved light output with intense light beam profile.
Journal ArticleDOI
Asymmetrical interface design for unidirectional light extraction from spectrum conversion films.
TL;DR: In this paper , a micro-sized photonic structure was proposed to extract 89% of the intrinsic trapped photons from the spectrum conversion film into free space using the Monte-Carlo ray-tracing method.
Journal ArticleDOI
Study on imprinting and replica molding of quasi-grey scale soft mold curved surface microstructure mold
Yung-Jin Weng,Chun-Yu Tsai +1 more
TL;DR: In this article, a photocuring system is first developed and built independently, then created the magnetic curved surface microstructure soft mold, the magnetic force of the magnetic curve surface via to different heights was obtained after tested and recorded.
Journal ArticleDOI
Liquid microsphere arrays for imaging magnification
Tongkai Gu,Lanlan Wang,Rui Li,Yanzhen Dong,Yajun Zhang,Mengchao Jia,Weitao Jiang,Hongzhong Liu +7 more
TL;DR: In this article, a template-directed self-assembly method was proposed to pull out liquid microsphere arrays from glycerol, which can serve as significant passageways for imaging photon transmission based on the evanescent waves coupling.
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Demonstration of multi-imaging and multifocusing through planar motheye kind of gradient microlens multi-array
TL;DR: In this paper, a bow-shape multifocus for broad spectrum of an unpolarized electromagnetic wave through these planar hexagonally packed microlens array is demonstrated using FDTD based simulation study.
References
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Journal ArticleDOI
Femtosecond Optical Breakdown in Dielectrics
M. Lenzner,Jörg Krüger,S. Sartania,Zhao Cheng,Ch. Spielmann,Gerard Mourou,Wolfgang Kautek,Ferenc Krausz +7 more
TL;DR: In this article, the optical breakdown threshold and ablation depth in dielectrics with different band gaps for laser pulse durations ranging from 5 ps to 5 fs at a carrier wavelength of 780 nm.
Journal ArticleDOI
Femtosecond laser ablation of silicon–modification thresholds and morphology
TL;DR: In this article, the initial modification and ablation of crystalline silicon with single and multiple Ti:sapphire laser pulses of 5 to 400 fs duration was investigated, and the authors found the phenomena amorphization, melting, re-crystallization, nucleated vaporization, and Ablation to occur with increasing laser fluence down to the shortest pulse durations.
Journal ArticleDOI
Tunable liquid-filled microlens array integrated with microfluidic network.
TL;DR: An elastomer-based tunable liquid-filled microlens array integrated on top of a microfluidic network is fabricated using soft lithographic techniques and can be used potentially in dynamic imaging systems and adaptive optics.
Journal ArticleDOI
Laser-solid interaction in the femtosecond time regime
TL;DR: In this paper, the authors describe the physical processes which come into play in laser-solid interaction on the ultrafast time scale open new routes of modifying the structure and the morphology of materials and offer interesting perspectives in laser materials processing.
Journal ArticleDOI
Micro lens fabrication by means of femtosecond two photon photopolymerization.
TL;DR: Compared to the conventional femtosecond two-photon fabrication, this work provides an alternative, effective and cheap processing method for the fabrication of micro optic device that requires arbitrary shape with high surface quality and small scale.