20results about "Systems characterised by carrier structure" patented technology

A sensor and method for page-based optical data storage. The sensor includes a partially-reflective mirror, a reflective mirror disposed substantially collinear with and spaced apart from the partially-reflective mirror, and an active layer disposed substantially collinear with and between the partially-reflective mirror and the reflective mirror. The partially-reflective mirror has a first and second side and transmits a portion of light incident on the first side. The reflective mirror reflects light incident on the reflective mirror toward the partially-reflective mirror. The active layer absorbs at least a portion of the light oscillating at the resonant frequency.

A method of writing voxels to a substrate using a laser writing system includes forming a first voxel at a first location in a substrate using a first laser pulse; detecting light emitted or scattered by the substrate due to the formation of the first voxel; determining whether the detected light satisfies a predetermined constraint; and adjusting the amplitude of the second laser pulse when the detected light does not satisfy the predetermined constraint. As a result of forming the voxel, light emission or scattering from the substrate is related to a property of the formed voxel. By monitoring such emission or scattering, changes in performance of the laser write system can be compensated. A laser writing system and a computer program product implementing the method are also provided herein.

Embodiments of the present disclosure relate to a system (800) for reading birefringence data. The system comprises one or more light sources (802, 804); a first polarization state generator (808) positioned to generate a first polarized polarization state from the light of the first wavelength band output by the one or more light sources; a second polarization state generator (810) positioned to generate second polarized light from light of a second wavelength band output by the one or more light sources; an image sensor (822) configured to acquire a sample region (814) from the first polarized light and the second polarized light; a polarization state analyzer (824) is arranged between the sample region and the image sensor; a first band-pass filter configured to pass light of a first wavelength band onto the image sensor; and a second band-pass filter configured to pass light of a second wavelength band onto the image sensor.

To provide a system and a method for reducing time used for reading data stored as birefringence in a dielectric storage medium.SOLUTION: A system (800) for reading birefringent data includes: one or more light sources (802 to 806); a first polarization state generator (808) positioned to generate first polarized light from light of a first wavelength band output by the one or more light sources; second polarization state generator (810); an image sensor (822) configured to acquire an image of a sample region (814) via the first polarized light and second polarized light; a polarization state analyzer (824) disposed between the sample region and the image sensor; a first bandpass filter configured to pass light of the first wavelength band onto the image sensor; and a second bandpass filter configured to pass light of the second wavelength band onto the image sensor.SELECTED DRAWING: Figure 8

A method of fabricating an optical element includes providing a substrate of a transparent material in which is to be formed a plurality of birefringent nanostructures spaced apart; generating from the output of a source of femtosecond laser pulses a laser beam group comprising a plurality of focused seeding beams having a circular polarisation; directing the laser beam group onto the surface of the substrate at a first position and applying one or more femtosecond laser pulses from each beam to corresponding volumes in the substrate; repeatedly translating the laser beam group relative to the substrate parallel to the line of seeding beams; translating the laser beam group relative to the substrate and repeating the repeated translation and application of the femtosecond laser pulses; wherein the relative translation of the laser beam group and the substrate aligns the writing beam with successive corresponding volumes.

A method for forming a birefringent voxel involves simultaneously generating a first seed pulse and a first data pulse. The first seed pulse and the first data pulse are spatially separated laser pulses having different amplitudes. The first seed pulse is focused to a first seed location, and the data pulse is focused to a first data location. The first seed location and the first data location are separated by a predetermined distance along the scanning path, with the first seed location being in front of the first data location. Subsequently, a second seed pulse and a second data pulse are generated and focused to a second seed location and a second data location, respectively. The second seed location and the second data location are separated by a predetermined distance. The second data location is the same as the first seed location, thereby resulting in the formation of a birefringent voxel.

Devices having at least one nanostructured layer derived from a binary sequence written onto an optical medium and methods of preparing the nanostructured layers.

Devices having at least one nanostructured layer derived from a binary sequence written onto an optical medium and methods of preparing the nanostructured layers.

One example provides a system (800) for reading birefringence data. The system includes one or more light sources (802, 804), a first polarization state generator (808) positioned to generate a first polarization from light of a first wavelength band output by the one or more light sources, a second polarization state generator (810) positioned to generate a second polarization from light of a second wavelength band output by the one or more light sources, an image sensor (822) configured to acquire images of a sample area (814) via the first polarization and the second polarization, a polarization state analyzer (824) positioned between the sample area and the image sensor, a first bandpass filter configured to pass light of the first wavelength band to reach the image sensor, and a second bandpass filter configured to pass light of the second wavelength band to reach the image sensor.

A method of writing voxels to a substrate using a laser writing system comprises forming a first voxel at a first position in a substrate using a first laser pulse; detecting light emitted or scattered by the substrate as a result of forming the first voxel; determining whether the detected light satisfies a predetermined constraint; and, when the detected light does not satisfy the predetermined constraint, adjusting an amplitude of a second laser pulse. Light emission or scattering from the substrate as a result of forming a voxel is related to the properties of the formed voxel. By monitoring such emission or scattering, it is made possible to compensate for variations in performance of the laser writing system. Also provided herein are a laser writing system and computer program product which implement the method.

Devices having at least one nanostructured layer derived from a binary sequence written onto an optical medium and methods of preparing the nanostructured layers.

A method for forming birefringent voxels includes simultaneously generating a first seed pulse and a first data pulse. The first seed pulse and the first data pulse are spatially separated laser pulses having different amplitudes. The first seed pulse is focused at a first seed location and the data pulse is focused at a first data location. The first seed location and the first data location are separated by a predetermined distance along the scan path, wherein the first seed location precedes the first data location. Subsequently, a second seed pulse and a second data pulse are generated and focused at a second seed position and a second data position, respectively. The second seed is separated from the data location by a predetermined distance. The second data location is the same as the first seed location, resulting in the formation of birefringent voxels.

A method for writing voxels onto a substrate using a laser writing system includes: forming a first voxel at a first position in the substrate using a first laser pulse; detecting light emitted or scattered by the substrate as a result of the formation of the first voxel; determining whether the detected light satisfies predetermined constraints; and adjusting the amplitude of a second laser pulse if the detected light does not satisfy the predetermined constraints. The light emission or scattering from the substrate as a result of voxel formation is related to the properties of the formed voxel. By monitoring such emission or scattering, it is possible to compensate for changes in the performance of the laser writing system. A laser writing system and a computer program product implementing the method are also provided herein.

A method for forming birefringent voxels comprises simultaneously generating a first seed pulse and a first data pulse. The first seed pulse and the first data pulse are spatially-separated laser pulses having different amplitudes. The first seed pulse is focused at a first seed location, and the data pulse is focused at a first data location. The first seed location and the first data location are separated by a predetermined distance along a scan path, with the first seed location being ahead of the first data location. Subsequently, a second seed pulse and a second data pulse are generated, and focused at a second seed location and second data location, respectively. The second seed and data locations are separated by the predetermined distance. The second data location is the same as the first seed location, resulting in formation of a birefringent voxel.

One example provides a computer-implemented method for reading data stored as birefringence values ​​in a storage medium, the method including: acquiring an image of voxels of the storage medium, applying a first low-pass filter having a first cutoff frequency to the image of voxels to obtain a first background image, applying a second low-pass filter having a second cutoff frequency to the image of voxels to obtain a second background image, the second cutoff frequency being different from the first cutoff frequency, determining an enhanced background image from the first background image and the second background image, determining a birefringence value for the enhanced background image, determining a birefringence value for the image of voxels, and correcting the birefringence value for the image of voxels based on the birefringence value for the enhanced background image.

A differential voxel symbol reader is alternatively configured to detect phase or polarization changes in a probe light beam caused by interactions with voxels distributed in an optical storage medium as light-scattering nanostructures. Rather than determine an absolute change in the state of the probe signal from an interaction with a voxel being read, a relative change is detected by comparing the probe light beam against an orthogonally-polarized reference light beam that propagates over an overlapping path with the probe light beam. The overlapping paths for the probe and reference light beams provide that each is subject to substantially the same impairments during propagation through the medium. The overlap largely cancels the effects of light scattering and impairments from the other voxels in the medium that cause shifts in phase and / or polarization which would otherwise scramble the signals to thereby reduce the accuracy and reliability of the reading process.

One example provides a computer-implemented method for reading data stored as birefringence values in a storage medium. The method comprises acquiring an image of a voxel of the storage medium, applying a first low-pass filter with a first cutoff frequency to the image of the voxel to obtain a first background image, applying a second low-pass filter with a second cutoff frequency to the image of the voxel to obtain a second background image, the second cutoff frequency being different than the first cutoff frequency, determining an enhanced background image from the first background image and the second background image, determining birefringence values for the enhanced background image, determining birefringence values for the image of the voxel, and correcting the birefringence values for the image of the voxel based upon the birefringence values for the enhanced background image.

A method of writing voxels to a substrate using a laser writing system comprises forming a first voxel at a first position in a substrate using a first laser pulse; detecting light emitted or scattered by the substrate as a result of forming the first voxel; determining whether the detected light satisfies a predetermined constraint; and, when the detected light does not satisfy the predetermined constraint, adjusting an amplitude of a second laser pulse. Light emission or scattering from the substrate as a result of forming a voxel is related to the properties of the formed voxel. By monitoring such emission or scattering, it is made possible to compensate for variations in performance of the laser writing system. Also provided herein are a laser writing system and computer program product which implement the method.

An optical disk device (2) comprises: an optical pickup (4) which includes a first laser beam source (10) that emits a laser beam, an objective lens (24) that converges, onto an optical disk (8), the laser beam emitted from the first laser beam source (10), and a light receiving element (30) that receives reflected light from the optical disk (8) and that performs photoelectric conversion of the received reflected light so as to output a light reception signal; an FS signal generation unit (54) which on the basis of the light reception signal from the light receiving element (30) generates an FS signal that indicates the amount of the reflected light from the optical disk (8); and a dirtiness determination unit (56) which, when the peak level of the FS signal is less than a dirtiness determination threshold, determines that the optical pickup (4) is dirty and controls the light receiving element (30) such that the peak level of the light reception signal from the light receiving element (30) is increased.

One example provides a system (800) for reading birefringence data. The system includes one or more light sources (802, 804); a first polarization state generator (808) positioned to produce a first polarized light polarization state from a first waveband of light output by the one or more light sources; a second polarization state generator (810) positioned to produce a second polarized light from a second waveband of light output by the one or more light sources; an image sensor (822) configured to acquire a sample region (814) by the first polarized light and the second polarized light; a polarization state analyzer (824) disposed between the sample region and the image sensor; a first bandpass filter configured to pass the first waveband of light onto the image sensor; and a second bandpass filter configured to pass the second waveband of light onto the image sensor.