3D microstructure fabrication for a dot array micro-optics using synchrotron radiation

2004 ◽  
Author(s):  
Y. Utsumi ◽  
M. Minamitani ◽  
T. Hattori
Keyword(s):  
Synchrotron Radiation ◽  
3D Microstructure ◽  
Microstructure Fabrication ◽  
Micro Optics

Evaluation on the Photoabsorber Composition Effect in Projection Microstereolithography

2012 ◽  
Vol 159 ◽  
pp. 109-114 ◽  
Author(s):  
Raman Ibrahim ◽  
Ibrahim Raman ◽  
Mohd Hafizul Hanif Ramlee ◽  
Mohammad Asraf Shaik Mohamed ◽  
Mustaffa Ibrahim ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Liquid Crystal Display ◽  
Research Progress ◽  
Composition Effect ◽  
3D Structures ◽  
3D Microstructure ◽  
Microstructure Fabrication ◽  
Sudan I ◽  
Projection Microstereolithography ◽  
Different Characteristics

This paper presents a research progress on composition photoabsorber effect the solidification time and layer thickness of 3D structures fabrication using Liquid Crystal Display (LCD) projector as energy light source to initiate the photoreactive polymer. The polymer based material with composition of 1,6-Hexanediol dicrylate, Phenylbis(2,4,6-trimethylbenzoyl)- phosphine oxide with varied Sudan I concentrations was used to build 3D structures. The structure was fabricated using a three different photo absorber composition of Sudan I then the photoreactive polymer solidification phe¬nomena was evaluated. Based on the result obtained, higher exposed time of the photo absorber will reduced the surface roughness values and increased the solidification layer time. This work represents that photo absorber composition solution gave a different characteristics for 3D microstructure fabrication.

Parameter Optimerization for Photo Polymerization of Microstereolithography

2012 ◽  
Vol 626 ◽  
pp. 420-424 ◽  
Author(s):  
K. Khairu ◽  
Ibrahim Raman ◽  
Mohammad Asraf Shaik Mohamed ◽  
Mustaffa Ibrahim ◽  
Wahab Saidin
Keyword(s):  
Surface Roughness ◽  
Liquid Crystal ◽  
Phosphine Oxide ◽  
Liquid Crystal Display ◽  
Reactive Polymer ◽  
Photo Polymerization ◽  
3D Microstructure ◽  
Microstructure Fabrication ◽  
Sudan I ◽  
Different Characteristics

This paper presents a research on composition photo absorber (Sudan I) effect based on curing parameter, the Liquid Crystal Display (LCD) projector as energy light source initiated the photo reactive polymer. The polymer based material with composition of 1, 6-Hexanediol dicrylate, Phenylbis (2,4,6-trimethylbenzoyl) phosphine oxide with varied Sudan I concentration was used to build 3D structures. The structure was fabricated with three different photo absorber concentrations 0.002%, 0.003%. and 0.006%. of Sudan I. In this experiment the photoreactive polymer solidification phenomena was evaluated.The experiment result obtained, that exposed time of the varied photo absorber was most significantly affect the surface roughness values and the solidification layer time regardless the layer thickness. This work represents that photo absorber composition solution gave a different characteristics for 3D microstructure fabrication.

Study on Layer Fabrication for 3D Structure of Photoreactive Polymer Using DLP Projector

2013 ◽  
Vol 465-466 ◽  
pp. 911-915
Author(s):  
Kamarudin Khairu ◽  
Mustaffa Ibrahim ◽  
S. Hassan ◽  
H. Hehsan ◽  
Ashari Kasmin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Light Intensity ◽  
Light Source ◽  
Exposure Time ◽  
3D Structure ◽  
Reactive Polymer ◽  
3D Microstructure ◽  
Microstructure Fabrication ◽  
Sudan I

This paper presents a research on 3D part fabrication from composition of photo initiator (Phenylbis (2,4,6-trimethylbenzoyl)), photo absorber (Sudan I) and 1, 6-Hexanediol polymer effect based on curing parameters. A DLP projector was used as energy light source which initiated the photo reactive polymer at three different light source distances with three different exposed time to evaluate photoreactive polymer solidification phenomena. The experiment results obtained shows that Sudan I composition, light intensity value and exposure time of the varied photo absorber give significant effect to layer thicknes, surface roughness and hardness value. These works also prove that photo absorber composition solution gave a different mechanical properties effect for 3D microstructure fabrication.

Fabrication of Textured 3D Microstructures Using ‘Bulk Lithography’

2012 ◽  
Author(s):  
Prasanna Gandhi ◽  
Kiran Bhole ◽  
Naresh Chaudhari
Keyword(s):  
Free Surface ◽  
Three Dimensional ◽  
Laser Exposure ◽  
Cad Model ◽  
Textured Surfaces ◽  
3D Microstructure ◽  
Dimensionless Energy ◽  
Microstructure Fabrication ◽  
Wide Energy ◽  
Exposure Energy

This paper presents the method of fabrication of textured three dimensional (3D) microstructures in single scan of laser beam. The textured 3D microstructures are obtained on one of the free surface (surface opposite to the substrate) of the microstructure. Fabrication of textured 3D microstructure is achieved using newly developed 3D microfabrication process termed as ‘Bulk lithography’. In this process the required depth variation is obtained during fabrication by allowing unconstrained depth photopolymerization and varying laser exposure while scanning. Hence, representative experimental results of dimensionless cured depth against dimensionless energy were obtained. Three different regimes of cured depth namely absorption, transition and scattering were observed under wide energy exposure. A predefined texture can be incorporated in CAD model itself and the structures can be fabricated when restricted to absorption dominant regime. However, the novelty of the proposed method lies in a distinct phenomenon observed in transition and scattering regime based on characteristic multiple scattering leading to textured surfaces in these regimes.. Further, it is observed experimentally that these textures are function of the exposure energy and are hypothyzed because of scattering of light.

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