Blue laser devices for optical data storage

AbstractTransparent glass has been identified as a vital medium for three-dimensional (3D) optical information storage and multi-level encryption. However, it has remained a challenge for directly writing 3D patterning inside a transparent glass using semiconductor blue laser instead of high-cost femtosecond laser. Here, we demonstrate that rare earth ions doped transparent glass can be used as 3D optical information storage and data encryption medium based on their reversible transmittance and photoluminescence manipulation. The color of tungsten phosphate glass doped with rare earth ions change reversibly from light yellow to blue upon alternating 473 nm laser illumination and temperature stimulation, resulting in the reversible luminescence modulation. The information data could be repeatedly written and erased in arbitrary 3D space of transparent glass, not only showing the ability of the excellent reproducibility and storage capacity, but also opening opportunities in information security. The present work expands the application fields of luminescent glass, and it is conducive to develop a novel 3D data storage and information encryption media.

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Application of Electroceramic Thin Films to Optical Waveguide Devices

MRS Bulletin ◽

10.1557/s0883769400035922 ◽

1996 ◽

Vol 21 (7) ◽

pp. 53-58 ◽

Cited By ~ 25

Author(s):

David K. Fork ◽

Florence Armani-Leplingard ◽

John J. Kingston

Keyword(s):

Thin Film ◽

Thin Films ◽

Data Storage ◽

Optical Waveguides ◽

Optical Data Storage ◽

Blue Laser ◽

Oxide Thin Film ◽

Optical Data ◽

Laser Source ◽

Ferroelectric Oxide

Electro-optic devices such as fast (>20 GHz) modulators are one application of ferroelectric-oxide thin-film waveguides. A compact, blue laser source of a few milliwatts power capable of lasting thousands of hours is of great interest as applied to optical data storage and xerography. Ferroelectric-oxide thin films offer several potential advantages over bulk materials for optical waveguides, though no electroceramic thin-film devices have replaced bulk devices yet. Bulk waveguides are defined by ion exchange, which produces only a small index difference. Thin films therefore permit higher intensity per unit power in the guide, and hence larger nonlinear effects and shorter interaction lengths.

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III-nitride photonic cavities

Nanophotonics ◽

10.1515/nanoph-2019-0442 ◽

2020 ◽

Vol 9 (3) ◽

pp. 569-598 ◽

Cited By ~ 3

Author(s):

Raphaël Butté ◽

Nicolas Grandjean

Keyword(s):

Data Storage ◽

Near Infrared ◽

Optical Data Storage ◽

Blue Laser ◽

Optical Data ◽

Light Emitting ◽

Third Harmonic ◽

Refractive Index Material ◽

Photonic Cavities ◽

Made In

AbstractOwing to their wide direct bandgap tunability, III-nitride (III-N) compound semiconductors have been proven instrumental in the development of blue light-emitting diodes that led to the so-called solid-state lighting revolution and blue laser diodes that are used for optical data storage. Beyond such conventional optoelectronic devices, in this review, we explore the progress made in the past 15 years with this low refractive index material family for the realization of microdisks as well as 2D and 1D photonic crystal (PhC) membrane cavities. Critical aspects related to their design and fabrication are first highlighted. Then, the optical properties of passive PhC structures designed for near-infrared such as their quality factor and their mode volume are addressed. Additional challenges dealing with fabrication pertaining to structures designed for shorter wavelengths, namely the visible to ultraviolet spectral range, are also critically reviewed and analyzed. Various applications ranging from second and third harmonic generation to microlasers and nanolasers are then discussed. Finally, forthcoming challenges and novel fields of application of III-N photonic cavities are commented.

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

Scientific Reports ◽

10.1038/s41598-021-91138-x ◽

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.

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

Coatings ◽

10.3390/coatings11070818 ◽

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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