Plasmonic Nanostructure Data Storage Density
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Solution Overview
Problem
Conventional compact disk storage devices have limited storage density due to large cell sizes, and existing methods to increase density primarily rely on shorter wavelength lasers, which are not sufficient to further reduce device size.
Innovation Solution
The use of frequency-modulated coding and data recording with two-layer plasmonic-dielectric nanostructures, where each cell on a transparent substrate has a concentric core-shell nanostructure with specific ratios of radii and aspect ratios, allowing for peak scattering at different frequencies when illuminated with infrared or visible light, enabling higher storage capacity by reducing cell size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shorter wavelength laser devices are used to increase storage density, then storage capacity is improved, but the reduction in cell size is insufficient
Solution Approach 1:
The patent changes the fundamental parameter of light-matter interaction from wavelength-dependent absorption to resonance frequency-dependent scattering. By tuning the plasmonic resonance frequency of nanostructures through parameter changes in geometry (radius ratios, aspect ratios) and material composition, the system achieves frequency-modulated coding that enables much smaller cell sizes while maintaining high storage capacity.
Solution Approach 2:
The patent employs composite plasmonic-dielectric nanostructures combining metal (plasmonic) and dielectric materials in core-shell configurations. This composite structure enables enhanced light scattering at specific resonance frequencies, allowing for frequency-modulated data encoding in extremely small cells that cannot be achieved with conventional single-material approaches.
2Quantity of substance
If cell size is reduced to increase storage density, then storage capacity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses parameter changes in the plasmonic resonance condition (through radius ratios and aspect ratios) as the encoding mechanism rather than relying solely on absolute size reduction. This allows manufacturing tolerance to be applied to the relative geometric parameters rather than absolute dimensions, significantly easing fabrication precision requirements while maintaining high storage density.
Solution Approach 2:
The patent introduces frequency as an additional dimension for data encoding. Instead of encoding information solely through spatial position in small cells, the system uses the resonance frequency of each nanostructure as an additional degree of freedom. This frequency modulation approach allows robust data storage even with variations in nanostructure size, effectively adding a spectral dimension to the storage scheme.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases storage density by allowing for smaller cell sizes and higher data storage capacity per unit area, potentially increasing it by a factor of 123 to 493 times that of conventional compact disks, depending on cell size, and enables N-ary optical data storage.
Implementation Method 1
each concentric plasmonic-dielectric nanostructure has a predetermined ratio of radii and a predetermined aspect ratio such that when an infrared or visible wavelength signal is applied to each concentric plasmonic-dielectric nanostructure a peak scattering amplitude of the applied signal is at different plasmonic resonance frequencies
Implementation Method 2
The reflection of the evanescent wave off of the plasmonic nanostructures in each cell is read using a near-field scanning optical microscope (NSOM) positioned above the cells
Data Source
AI summary
A frequency-modulated coding and data recording and storage device that uses plasmonic-dielectric nanostructures of concentric two-layer core-shell design to store data includes a flat transparent substrate having a top surface divided into cells with side dimension d on the order of tens of nanometers and a core-shell plasmonic-dielectric nanostructure disposed in each cell. Each plasmonic nanostructure of concentric core-shell has a predetermined ratio of radii and a predetermined aspect ratio such that when an infrared or visible wavelength signal is applied to each said core-shell plasmonic-dielectric nanostructure a peak scattering amplitude of the applied signal is at different plasmonic resonance frequencies for core-shell plasmonic-dielectric nanostructures with different ratio of radii and different aspect ratios. The sampled values of a signal to be recorded are assigned to each cell and the ratio of radii and/or aspect ratios of the core-shell plasmonic-dielectric nanostructures in the assigned cells are selected to provide a corresponding plasmonic resonant frequency.