Novel periodic microstructures fabricated by multi-exposure two-beam interference lithography

2010 ◽  
Author(s):  
Yinbing Bai ◽  
A. Ping Zhang
Keyword(s):  
Interference Lithography ◽  
Periodic Microstructures

Fabrication of Periodic Microstructures on Nickel Template by Multi-Beam Laser Interference

2014 ◽  
Vol 618 ◽  
pp. 146-149
Author(s):  
Lei Zhang ◽  
Ru Yi Xiang ◽  
Xiao Wen Cao ◽  
Shun Guang Li ◽  
Hui Chao Sun
Keyword(s):  
Femtosecond Laser ◽  
Large Scale ◽  
Experimental Results ◽  
Interference Lithography ◽  
Laser Interference Lithography ◽  
Microfluidic Chips ◽  
Laser Interference ◽  
Beam Laser ◽  
Periodic Microstructures

Complex microstructures can be fabricated on nickel template directly by femtosecond laser. But the efficiency is low and much time is inevitable when large scale microstructures are fabricated. The multi-beam interference provides an effective method for fabrication of large scale microstructures. This paper mainly focuses on direct ablation of nickel template by four-beam interference and fabricating periodic microstructures by laser interference lithography. Experimental results show that submicron periodic stripes and column structures can be produced on the nickel template by laser interference, laying the foundation of making nickel molds for microfluidic chips.

On resolving fine periodic microstructures in the optical microscope

1989 ◽  
Vol 47 ◽  
pp. 364-365
Author(s):  
W.S. Putnam ◽  
C. Viney
Keyword(s):  
Liquid Crystalline ◽  
Numerical Aperture ◽  
Polarized Light ◽  
Normal Incidence ◽  
Optical Microscope ◽  
Angle Of Incidence ◽  
Resolution Limit ◽  
Crystalline Materials ◽  
Periodic Microstructures ◽  
Liquid Crystalline Materials

Many sheared liquid crystalline materials (fibers, films and moldings) exhibit a fine banded microstructure when observed in the polarized light microscope. In some cases, for example Kevlar® fiber, the periodicity is close to the resolution limit of even the highest numerical aperture objectives. The periodic microstructure reflects a non-uniform alignment of the constituent molecules, and consequently is an indication that the mechanical properties will be less than optimal. Thus it is necessary to obtain quality micrographs for characterization, which in turn requires that fine detail should contribute significantly to image formation.It is textbook knowledge that the resolution achievable with a given microscope objective (numerical aperture NA) and a given wavelength of light (λ) increases as the angle of incidence of light at the specimen surface is increased. Stated in terms of the Abbe resolution criterion, resolution improves from λ/NA to λ/2NA with increasing departure from normal incidence.

2D periodic structures patterned on 3D surfaces by interference lithography for SERS

2018 ◽  
Vol 461 ◽  
pp. 171-174 ◽  
Author(s):  
Ivana Lettrichova ◽  
Agata Laurencikova ◽  
Dusan Pudis ◽  
Jozef Novak ◽  
Matej Goraus ◽  
...  
Keyword(s):  
Periodic Structures ◽  
Interference Lithography ◽  
3D Surfaces

scholarly journals Wettability control of polymeric microstructures replicated from laser-patterned stamps

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yangxi Fu ◽  
Marcos Soldera ◽  
Wei Wang ◽  
Stephan Milles ◽  
Kangfa Deng ◽  
...  
Keyword(s):  
Contact Angle Hysteresis ◽  
Contact Angles ◽  
Spatial Period ◽  
Structured Surfaces ◽  
High Adhesion ◽  
Direct Laser ◽  
Periodic Microstructures ◽  
Structure Height ◽  
Direct Laser Interference Patterning ◽  
Micropillar Arrays

AbstractIn this study, two-step approaches to fabricate periodic microstructures on polyethylene terephthalate (PET) and poly(methyl methacrylate) (PMMA) substrates are presented to control the wettability of polymeric surfaces. Micropillar arrays with periods between 1.6 and 4.6 µm are patterned by plate-to-plate hot embossing using chromium stamps structured by four-beam Direct Laser Interference Patterning (DLIP). By varying the laser parameters, the shape, spatial period, and structure height of the laser-induced topography on Cr stamps are controlled. After that, the wettability properties, namely the static, advancing/receding contact angles (CAs), and contact angle hysteresis were characterized on the patterned PET and PMMA surfaces. The results indicate that the micropillar arrays induced a hydrophobic state in both polymers with CAs up to 140° in the case of PET, without modifying the surface chemistry. However, the structured surfaces show high adhesion to water, as the droplets stick to the surfaces and do not roll down even upon turning the substrates upside down. To investigate the wetting state on the structured polymers, theoretical CAs predicted by Wenzel and Cassie-Baxter models for selected structured samples with different topographical characteristics are also calculated and compared with the experimental data.

scholarly journals Optimal polarization modulation for orthogonal two-axis Lloyd’s mirror interference lithography

2017 ◽  
Vol 25 (19) ◽  
pp. 22237 ◽  
Author(s):  
Xiuguo Chen ◽  
Zongwei Ren ◽  
Yuki Shimizu ◽  
Yuan-liu Chen ◽  
Wei Gao
Keyword(s):  
Interference Lithography ◽  
Polarization Modulation
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