Optimization of Multi-Layer Data Recording and Reading in an Optical Disc

Storage capacity of a conventional optical disc can be enhanced significantly by recording data within the three-dimensional volume. However, spherical aberrations and light-scattering limit the number of layers that can be efficiently recorded and retrieved. In this paper, we show that by optimizin...

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Bibliographic Details
Published in:Photonics 2022-10, Vol.9 (10), p.690
Main Authors: Jain, Ashish, Rahimian, Mitra G., Bhardwaj, V. R.
Format: Article
Language:English
Subjects:
Data recording
Diffraction theory
Electric fields
Energy
Lasers
Light
Multilayers
nanofabrication
optical data storage
Optical disks
Optics
Optimization
Polycarbonate
Scattering
Storage capacity
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Summary:Storage capacity of a conventional optical disc can be enhanced significantly by recording data within the three-dimensional volume. However, spherical aberrations and light-scattering limit the number of layers that can be efficiently recorded and retrieved. In this paper, we show that by optimizing the multi-layer data recording and reading parameters, the number of fabricated layers could be tripled to 60 in commercial grade poly-methyl-methacrylate polycarbonate and reduce the read laser power by a factor of 7 by the 20th layer. Influence of spherical aberration on write laser spot size was studied by using vector diffraction theory and compared with experimental values obtained by monitoring the threshold energy of the write laser with depth. Scattering losses of the read laser were studied by simulating the propagation of light through multi-layered micro-structured material. The main advantage of our technique is its practical implementation, as it refrains from the use of index-matching liquids and specialized optics during the read–write process.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics9100690