scholarly journals Fabrication of microscale medical devices by two-photon polymerization with multiple foci via a spatial light modulator

2011 ◽  
Vol 2 (11) ◽  
pp. 3167 ◽  
Author(s):  
Shaun D. Gittard ◽  
Alexander Nguyen ◽  
Kotaro Obata ◽  
Anastasia Koroleva ◽  
Roger J. Narayan ◽  
...  
Keyword(s):  
Medical Devices ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Two Photon ◽  
Two Photon Polymerization

Projection two-photon polymerization using a spatial light modulator

2014 ◽  
Vol 331 ◽  
pp. 82-86 ◽  
Author(s):  
Liang Yang ◽  
Jiawen Li ◽  
Yanlei Hu ◽  
Chenchu Zhang ◽  
Zhaoxin Lao ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator ◽  
Two Photon ◽  
Two Photon Polymerization

Axial Control of Two-Photon Polymerization With Femtosecond Bessel Beam

2017 ◽  
Author(s):  
Xiaoming Yu ◽  
Meng Zhang ◽  
Shuting Lei
Keyword(s):  
3D Printing ◽  
Bessel Beam ◽  
Average Diameter ◽  
Axial Direction ◽  
Polymerization Process ◽  
Layer By Layer ◽  
Light Modulator ◽  
Simultaneous Generation ◽  
Two Photon ◽  
Two Photon Polymerization

Stereolithography of three-dimensional, arbitrarily-shaped objects is achieved by successively curing photopolymer on multiple 2D planes and then stacking these 2D slices into 3D objects. Often as a bottleneck for speeding up the fabrication process, this layer-by-layer approach originates from the lack of axial control of photopolymerization. In this paper, we present a novel stereolithography technology with which two-photon polymerization can be dynamically controlled in the axial direction using Bessel beam generated from a spatial light modulator (SLM) and an axicon. First, we use unmodulated Bessel beam to fabricate micro-wires with an average diameter of 100 μm and a length exceeding 10 mm, resulting in an aspect ratio > 100:1. A study on the polymerization process shows that a fabrication speed of 2 mm/s can be achieved. Defect and deformation are observed, and the micro-wires consist of multiple narrow fibers which indicate the existence of the self-writing effect. A test case is presented to demonstrate fast 3D printing of a hollow tube within one second. Next, we modulate the Bessel beam with an SLM and demonstrate the simultaneous generation of multiple focal spots along the laser propagation direction. These spots can be dynamically controlled by loading an image sequence on the SLM. The theoretical foundation of this technology is outlined, and computer simulation is conducted to verify the experimental results. The presented technology extends current stereolithography into the third dimension, and has the potential to significantly increase 3D printing speed.

scholarly journals High Fidelity Spatial Light Modulator Configuration for Photo-Stimulation

2021 ◽  
Vol 9 ◽  
Author(s):  
Samira Aghayee ◽  
Mitchell Weikert ◽  
Phillip Alvarez ◽  
Gabriel A. Frank ◽  
Wolfgang Losert
Keyword(s):  
Spatial Light Modulator ◽  
Signal To Noise Ratio ◽  
Spatial Light Modulators ◽  
High Signal ◽  
High Fidelity ◽  
Light Modulator ◽  
Fourier Plane ◽  
Two Photon ◽  
Light Modulators ◽  
The Brain

For their capacity to shape optical wavefronts in real time into any desired illumination pattern, phase-only Spatial Light Modulators (SLM) have proven to be powerful tools for optical trapping and micromanipulation applications. SLMs are also becoming increasingly utilized in selective photo-stimulation of groups of neurons in the brain. However, conventional SLM based wavefront modulation introduces artifacts that are particularly detrimental for photo-stimulation applications. The primary issue is the unmodulated light that travels along the 0th order of diffraction. This portion of light is commonly blocked at the center of the object plane, which prevents photo-stimulation in the blocked region. We demonstrate a virtual lens configuration that moves the 1st order diffraction with the desired illumination pattern into the Fourier plane of the 0th order light. This virtual lens setup makes the whole field of view accessible for photo-stimulation and eliminates the need for removing the 0th order light in two-photon applications. Furthermore, in an example application to reconstruct a pattern consisting of an array of points, the virtual lens configuration increases the uniformity of the intensities these points. Moreover, diffraction-induced artifacts are also significantly reduced within the target plane. Therefore, our proposed high fidelity configuration yields target points with high signal to noise ratio.

Femtosecond Two-Photon 3D Lightfield Lithography

2021 ◽  
Author(s):  
Aravind Jakkinapalli ◽  
Balaji Baskar ◽  
Sy-Bor Wen
Keyword(s):  
Spatial Light Modulator ◽  
Light Field ◽  
Single Photon ◽  
Microlens Array ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Virtual Image ◽  
Light Modulator ◽  
Two Photon ◽  
Uv Led

Abstract Based on the successful single-photon 3D light field photolithography we demonstrated in the last year, we extend the methodology to femtosecond 3D light field lithography. Compared with our previous single-photon work with UV LED light, using femtosecond light and the associated two-photon light absorption in 3D light field lithography can cure photoresist only around designed voxel locations in a 3D space. Such a two-photon scheme can prevent the unwilling curing of photoresists along the optical paths of rays before arriving at designed voxel locations, which is observed in our previous UV LED-based single-photon 3D light field lithography. The experimental scheme of femtosecond two-photon 3D light field lithography starts from delivering uniform femtosecond laser pulses to a spatial light modulator. The designed pixel map is presented on the spatial light modulator and then delivered to a microlens array to construct a 3D virtual image in the free space. By compressing the 3D virtual image in a photoresist layer with a microscope system, we can successfully generate different microscale 3D patterns without relying on scanning processes as in traditional 3D lithography. In this study, we present preliminary results of (a) algorithms developed to generated 3D patterns with femtosecond light, which should satisfy additional constraints when femtosecond light is used, and (b) 3D patterns generated in photoresists with femtosecond two-photon 3D light field lithography.

Two-photon excitation microscopy with spatial light modulator

2017 ◽  
Author(s):  
Naoya Matsumoto ◽  
Alu Konno ◽  
Takashi Inoue ◽  
Haruyoshi Toyoda ◽  
Toshiyuki Miwa ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation
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