scholarly journals High-quality micropattern printing by interlacing-pattern holographic femtosecond pulses

Nanophotonics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 2895-2904 ◽  
Author(s):  
Zhipeng Wang ◽  
Xiaowei Li ◽  
Lan Jiang ◽  
Bohong Li ◽  
Qunshuo Wei ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Efficiency ◽  
Speckle Noise ◽  
Device Fabrication ◽  
Spatial Light Modulators ◽  
Direct Writing ◽  
Optical Fields ◽  
High Quality ◽  
Target Pattern ◽  
Light Modulators

AbstractTo improve the efficiency of femtosecond laser direct writing, holographic femtosecond laser patterning using spatial light modulators has been widely used for the processing of micro/nanopatterns. However, the speckle noise of modulated optical fields severely limits the quality of fabricated patterns. We present a simple and effective method which involves interlacing a target pattern into a series of target subpatterns that consist of spaced spots to solve this problem. The separation of spots weakens the random interference between adjacent spots of optical fields, so the speckle noise reduces effectively, which improves the uniformity of the modulated optical fields and makes the fabricated patterns with high quality. With optimal interlacing numbers, complex micropattern arrays containing curved edges and sophisticated structures can be fabricated with superior quality and high efficiency. Binary holograms with improved optical characterization are realized by using the interlacing-pattern method, revealing the extensive potential of this method in micropattern processing and functional device fabrication with high quality and efficiency.

scholarly journals Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 204
Author(s):  
Di Wang ◽  
Yi-Wei Zheng ◽  
Nan-Nan Li ◽  
Qiong-Hua Wang
Keyword(s):  
Optical Element ◽  
Speckle Noise ◽  
Beam Shaping ◽  
Diffractive Optical Element ◽  
The Other ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Display System ◽  
Holographic Display ◽  
Light Modulators

In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image. By calculating the effective viewing angle of the reconstructed image, the effective hologram and the effective region of the SLM are calculated accordingly. Then, the size of the diffractive optical element (DOE) is calculated accordingly. The dynamic DOEs and effective hologram are loaded on the effective regions of the two SLMs, respectively, while the wasted areas of the two SLMs are performed with zero-padded operations. When the laser passes through the first SLM, the light can be modulated by the effective DOEs. When the modulated beam illuminates the second SLM which is loaded with the effective hologram, the image is reconstructed with better quality and lower speckle noise. Moreover, the calculation time of the hologram is reduced. Experiments indicate the validity of the proposed system.

scholarly journals Progress in fabrication of waveguide spatial light modulators via femtosecond laser micromachining

2017 ◽  
Author(s):  
Nickolaos Savidis ◽  
Sundeep Jolly ◽  
Bianca Datta ◽  
Michael Moebius ◽  
Thrasyvoulos Karydis ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Micromachining ◽  
Spatial Light Modulators ◽  
Light Modulators ◽  
Femtosecond Laser Micromachining

The Moving Liquid Mirror (MLM) Spatial Light Modulator: Simulation and Measurement of the Optical Performance

2000 ◽  
Author(s):  
Alexander Wolter ◽  
Detlef Kunze ◽  
Wolfgang Doleschal ◽  
Hubert Lakner ◽  
Günter Zimmer
Keyword(s):  
Adaptive Optics ◽  
Cmos Technology ◽  
Optical Signal ◽  
Spatial Light Modulators ◽  
Direct Writing ◽  
Writing Systems ◽  
Electrode Structure ◽  
Light Modulator ◽  
Light Modulators ◽  
Moving Liquid

Abstract Spatial light modulators (SLM) are electro-optical devices employed as optical pattern generators in applications like projection displays, direct-writing systems for photolithographic patterning, adaptive optics or optical signal processing. Here we report on the “moving liquid mirror” (MLM) as a new micromechanical actuator technology based on a deformable oil film on an aluminum mirror with electrode structure. The actuator is suitable for integration on a silicon backplane as CMOS-addressing circuit. Thus production in standard CMOS-technology is possible. A theoretical analysis of the device behavior is given, and the results of simulations are presented. Measurements on passive devices show good agreement with the simulations. Finally, active MLM-devices have been fabricated. Images can be programmed into the devices and observed under a microscope (figure 1).

Accurate Encoding Of Complex Optical Fields With Pixelated Phase-Only Spatial Light Modulators

2007 ◽  
Author(s):  
Victor Arrizón ◽  
Ulises Ruiz ◽  
Rosibel Carrada ◽  
Luis A. González ◽  
Jón Atli Benediktsson ◽  
...  
Keyword(s):  
Spatial Light Modulators ◽  
Optical Fields ◽  
Light Modulators

scholarly journals High-Efficiency Fabrication of Geometric Phase Elements by Femtosecond-Laser Direct Writing

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1737
Author(s):  
Shuai Xu ◽  
Hua Fan ◽  
Si-Jia Xu ◽  
Zhen-Ze Li ◽  
Yuhao Lei ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Geometric Phase ◽  
High Efficiency ◽  
Fine Tuning ◽  
Free Form ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Manufacturing Method ◽  
Flexible Technology ◽  
Visible Wavelengths

The nanoresolution of geometric phase elements for visible wavelengths calls for a flexible technology with high throughout and free from vacuum. In this article, we propose a high-efficiency and simple manufacturing method for the fabrication of geometric phase elements with femtosecond–laser direct writing (FsLDW) and thermal annealing by combining the advantages of high-efficiency processing and thermal smoothing effect. By using a femtosecond laser at a wavelength of 343 nm and a circular polarization, free-form nanogratings with a period of 300 nm and 170-nm-wide grooves were obtained in 50 s by laser direct ablation at a speed of 5 mm/s in a non-vacuum environment. After fine-tuning through a hot-annealing process, the surface morphology of the geometric phase element was clearly improved. With this technology, we fabricated blazed gratings, metasurface lens, vortex Q-plates and “M” holograms and confirmed the design performance by analyzing their phases at the wavelength of 808 nm. The efficiency and capabilities of our proposed method can pave the possible way to fabricate geometric phase elements with essentially low loss, high-temperature resistance, high phase gradients and novel polarization functionality for potentially wide applications.

scholarly journals Fabrication of waveguide spatial light modulators via femtosecond laser micromachining

2016 ◽  
Author(s):  
Nickolaos Savidis ◽  
Sundeep Jolly ◽  
Bianca Datta ◽  
Thrasyvoulos Karydis ◽  
V. M. Bove
Keyword(s):  
Femtosecond Laser ◽  
Laser Micromachining ◽  
Spatial Light Modulators ◽  
Light Modulators ◽  
Femtosecond Laser Micromachining

Dynamic Airy imaging through high-efficiency broadband phase microelements by femtosecond laser direct writing

2020 ◽  
Vol 8 (6) ◽  
pp. 875
Author(s):  
Ze Cai ◽  
Xinbo Qi ◽  
Deng Pan ◽  
Shengyun Ji ◽  
Jincheng Ni ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Efficiency ◽  
Direct Writing ◽  
Laser Direct Writing
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