Flexible four-dimensional optical data storage enabled by single-pulse femtosecond laser irradiation in thermoplastic polyurethane

2021 ◽  
Author(s):  
Weiliang Chen ◽  
Zhi Yan ◽  
Jie Tian ◽  
Siyuan Liu ◽  
Jichao Gao ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Data Storage ◽  
Thermoplastic Polyurethane ◽  
Single Pulse ◽  
Optical Data Storage ◽  
Femtosecond Laser Irradiation ◽  
Optical Data

scholarly journals Application of Femtosecond-Laser Induced Nanostructures in Optical Memory

2007 ◽  
Vol 7 (1) ◽  
pp. 94-104 ◽  
Author(s):  
Yasuhiko Shimotsuma ◽  
Masaaki Sakakura ◽  
Kiyotaka Miura ◽  
Jiarong Qiu ◽  
Peter G. Kazansky ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Acoustic Waves ◽  
Pressure Wave ◽  
Optical Data Storage ◽  
Femtosecond Laser Irradiation ◽  
Optical Data ◽  
Photothermal Effect ◽  
Soda Lime Glass ◽  
Longitudinal Sound Velocity

The femtosecond laser induced micro- and nanostructures for the application to the three-dimensional optical data storage are investigated. We have observed the increase of refractive index due to local densification and atomic defect generation, and demonstrated the real time observation of photothermal effect after the femtosecond laser irradiation inside a glass by the transient lens (TrL) method. The TrL signal showed a damped oscillation with about an 800 ps period. The essential feature of the oscillation can be reproduced by the pressure wave creation and propagation to the outward direction from the irradiated region. The simulation based on elastodynamics has shown that a large thermoelastic stress is relaxed by the generation of the pressure wave. In the case of soda-lime glass, the velocity of the pressure wave is almost same as the longitudinal sound velocity at room temperature (5.8 μm/ns). We have also observed the localized photo-reduction of Sm3+ to Sm2+ inside a transparent and colorless Sm3+-doped borate glass. Photoluminescence spectra showed that some the Sm3+ ions in the focal spot within the glass sample were reduced to Sm2+ ions after femtosecond laser irradiation. A photo-reduction bit of 200 nm in three-dimensions can be recorded with a femtosecond laser and readout clearly by detecting the fluorescence excited by Ar+ laser (λ = 488 nm). A photo-reduction bit can be also erased by photo-oxidation with a cw Ar+ laser (λ = 514 5 nm). Since photo-reduction bits can be spaced 150 nm apart in a layer within glass, a memory capacity of as high as 1 Tbit can be achieved in a glass piece with dimensions of 10 mm × 10 mm × 1 mm. We have also demonstrated the first observation of the polarization-dependent periodic nanostructure formation by the interference between femtosecond laser light and electron acoustic waves. The observed nanostructures are the smallest embedded structures ever created by light. The period of self-organized nanostructures can be controlled from ∼140 to 320 nm by the pulse energy and the number of irradiated pulses. Furthermore, we have also observed the self-assembled sub-wavelength periodic structures created in silica glass by femtosecond pulses on the plane of the propagation of light.

Femtosecond laser application for high capacity optical data storage

2004 ◽  
Vol 79 (4-6) ◽  
pp. 791-794 ◽  
Author(s):  
M.H. Hong ◽  
B. Luk’yanchuk ◽  
S.M. Huang ◽  
T.S. Ong ◽  
L.H. Van ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Data Storage ◽  
High Capacity ◽  
Optical Data Storage ◽  
Optical Data ◽  
Laser Application

Femtosecond laser-induced permanent anisotropy in bacteriorhodopsin films and applications in optical data storage

2013 ◽  
Vol 60 (4) ◽  
pp. 309-314 ◽  
Author(s):  
Xianghua Yu ◽  
Baoli Yao ◽  
Ming Lei ◽  
Peng Gao ◽  
Baiheng Ma
Keyword(s):  
Femtosecond Laser ◽  
Data Storage ◽  
Optical Data Storage ◽  
Optical Data

Feasibility of Femtosecond Laser Writing Multi-Layered Bit Planes in Fused Silica for Three-Dimensional Optical Data Storage

2001 ◽  
Vol 18 (4) ◽  
pp. 541-543 ◽  
Author(s):  
Li Cheng-De ◽  
Wang Dan-Ling ◽  
Luo Le ◽  
Yang Hong ◽  
Xia Zong-Ju ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Data Storage ◽  
Three Dimensional ◽  
Fused Silica ◽  
Optical Data Storage ◽  
Optical Data ◽  
Laser Writing ◽  
Bit Planes

Generation of nano-bumps on transparent quartz glass surface under femtosecond laser irradiation

2008 ◽  
Author(s):  
Wei Guo ◽  
Zeng Bo Wang ◽  
Lin Li ◽  
Zhu Liu ◽  
Boris Luk’yanchuk ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Quartz Glass ◽  
Glass Surface ◽  
Femtosecond Laser Irradiation

scholarly journals Structural and optical properties of amorphous Si–Ge–Te thin films prepared by combinatorial sputtering

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Mihai ◽  
F. Sava ◽  
I. D. Simandan ◽  
A. C. Galca ◽  
I. Burducea ◽  
...  
Keyword(s):  
Optical Properties ◽  
Data Storage ◽  
Optical Sensors ◽  
Material Selection ◽  
Functional Materials ◽  
Stability Study ◽  
Optical Data Storage ◽  
Optical Data ◽  
Structural And Optical Properties ◽  
Topological Constraint

AbstractThe lack of order in amorphous chalcogenides offers them novel properties but also adds increased challenges in the discovery and design of advanced functional materials. The amorphous compositions in the Si–Ge–Te system are of interest for many applications such as optical data storage, optical sensors and Ovonic threshold switches. But an extended exploration of this system is still missing. In this study, magnetron co-sputtering is used for the combinatorial synthesis of thin film libraries, outside the glass formation domain. Compositional, structural and optical properties are investigated and discussed in the framework of topological constraint theory. The materials in the library are classified as stressed-rigid amorphous networks. The bandgap is heavily influenced by the Te content while the near-IR refractive index dependence on Ge concentration shows a minimum, which could be exploited in applications. A transition from a disordered to a more ordered amorphous network at 60 at% Te, is observed. The thermal stability study shows that the formed crystalline phases are dictated by the concentration of Ge and Te. New amorphous compositions in the Si–Ge–Te system were found and their properties explored, thus enabling an informed and rapid material selection and design for applications.

scholarly journals Optical Isomerization and Photo-Patternable Properties of GeO2/Ormosils Organic-Inorganic Composite Films Doped with Azobenzene

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 818
Author(s):  
Xuehua Zhang ◽  
Qian Wang ◽  
Shun Liu ◽  
Wei Zhang ◽  
Fangren Hu ◽  
...  
Keyword(s):  
Optical Waveguide ◽  
Data Storage ◽  
Optical Switching ◽  
Sol Gel ◽  
Composite Films ◽  
Optical Data Storage ◽  
Optical Data ◽  
Single Chip ◽  
Coating Method ◽  
Inorganic Composite

GeO2/organically modified silane (ormosils) organic-inorganic composite films containing azobenzene were prepared by combining sol-gel technology and spin coating method. Optical waveguide properties including the refractive index and thickness of the composite films were characterized by using a prism coupling instrument. Surface morphology and photochemical properties of the composite films were investigated by atomic force microscope and Fourier transform infrared spectrometer. Results indicate that the composite films have smooth and neat surface, and excellent optical waveguide performance. Photo-isomerization properties of the composite films were studied by using a UV–Vis spectrophotometer. Optical switching performance of the composite films was also studied under the alternating exposure of 365 nm ultraviolet light and 410 nm visible light. Finally, strip waveguides and microlens arrays were built in the composite films through a UV soft imprint technique. Based on the above results, we believe that the prepared composite films are promising candidates for micro-nano optics and photonic applications, which would allow directly integrating the optical data storage and optical switching devices onto a single chip.

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