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
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Superhydrophobic Artificial Compound Eye with High Transparency.
TL;DR: In this article, an artificial compound eye (ACE) is endowed with stable superhydrophobicity and high transparency without affecting its optical performance, which can be used to fabricate a microimaging system by combining photolithography, inkjet printing, and chemical growth.
Journal ArticleDOI
Microfabrication of Microlens by Timed-Development-and-Thermal-Reflow (TDTR) Process for Projection Lithography.
TL;DR: A microlens fabrication process using the timed-development-and-thermal-reflow process, which can fabricate various types of aperture geometry with a parabolic profile on a single substrate in the same batch of the process, is presented.
Journal ArticleDOI
Rapid Selective Ablation and High-Precision Patterning for Micro-Thermoelectric Devices Using Femtosecond Laser Directing Writing
João Costa,Chuan Zhao +1 more
TL;DR: In this paper , a femtosecond laser direct writing technique was used to achieve high-precision array patterning for the micro-TE device through the femto-conditional laser direct write technique.
Dissertation
Folds in floating membranes : from elastic sheets to granular rafts
TL;DR: In this article, the buckling instability of a model particle-loaded interface was investigated under the continuum mechanics framework, showing that the shape and stiffness of granular rafts can be predicted numerically.
Journal ArticleDOI
Rapid Fabrication of Large-Area Concave Microlens Array on ZnSe
TL;DR: In this paper, a single-step method for the fabrication of a zinc selenide (ZnSe) concave microlens array through the high-speed line-scanning of a femtosecond laser pulse is presented.
References
More filters
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.