摘要:
Mastering techniques are described that can improve the quality of a master used in data storage disk manufacturing. In one embodiment, the techniques include depositing a multi-layer structure adjacent a substrate layer of the master, the multi-layer structure including a first layer, a second layer formed over the first layer, and a third layer formed over the second layer, wherein the first layer comprises a substantially reflective base layer. The techniques also include defining a portable conformable mask (PCM) with the third layer, and defining a feature of the master in the second layer through the PCM of the third layer. In some embodiments, a nanometer scale topographical feature may be defined in the first layer of the master via an etching process or a thin film deposition.
摘要:
The invention is directed to a spatial light modulator device that can improve holographic data recording systems, and various methods and systems incorporating the device. The spatial light modulator device includes a diffusive element to diffuse or scatter a data encoded object beam. For example, the diffusive element may comprise a two-layer diffusive laminate formed, a polymer dispersed liquid crystal material, or another diffusive material. The diffusive element can be formed over the output window, or may comprise the output window of the spatial light modulator device. In any case, the diffusive element can slightly scatter the data encoded object beam, which can significantly reduce undesirable zero-order burning effects in a holographic medium positioned in proximity to a Fourier transform plane.
摘要:
This disclosure describes a data storage medium, such as an optical disk, that includes a visually recognizable sensing element that changes in appearance in response to exposure to an environmental condition. The sensing element may sense any of a wide variety of environmental conditions, such as exposure to ultraviolet (UV) radiation, ozone, moisture, other non-UV spectrums of light, corrosive gasses, or the like. The invention can promote data integrity by alerting a user of possible media degradation.
摘要:
A system for precisely determining a position with resolution on the order of nanometers or sub-nanometers is described. In particular, a system is described that utilizes a first and a second sensor assembly to determine a position of a movable element over a distance many times the capable range of operation of either of the individual sensor assemblies. The two sensor assemblies leap-frog one another in an incremental fashion to ensure that at least one of the sensor assemblies is always within it operational range. Positional signals generated by one of the sensor assemblies can be used to calibrate the other sensor assembly, following an adjustment of the other sensor assembly. The described invention may be implemented in an optical storage disk mastering system to determine the position of mastering optics as the mastering optics translate over the surface of a storage master disk.
摘要:
The invention is directed to a holographic data storage system including a spatial light modulator device (SLM) that comprises optical elements in the form of polymer dispersed liquid crystal (PDLC) elements. The PDLC elements are individually controllable, and can be made substantially transparent or substantially diffusive. The “on” or “off” state of each PDLC element is defined by whether the given PDLC element is transparent or diffusive. Additional states may also be defined for the PDLC elements, e.g., based on a level of diffusiveness of the PDLC elements. Also, a mirror layer may be added adjacent the PDLC elements to define a reflective-mode SLM. In any case, the SLM is used to encode bit maps into a holographic object beam.
摘要:
Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. The holographic media formulation is often formed of two or more components mixed to obtain a homogeneous formulation. The holographic media formulation may include two or more components which are mixed together prior to injection between the substrates. Curing of the holographic media formulation is substantially avoided during mixing, yet accelerated after the formulation is injected between the substrates. Accordingly, the system and techniques can be used to improve the large scale manufacturability of such media by allowing for fabrication of such media within reasonable cycle times, such as less than one minute, while adhering to stringent requirements for optical clarity and parallelism.
摘要:
Mastering techniques are described that utilize drive recordable master media to generate low-cost, high-resolution masters. A master medium comprises a preformatted substrate layer that includes tracking features, e.g., grooves and lands, and a developable layer formed over the preformatted substrate layer. The developable layer may comprise a phase-change material, a thin film transition metal, or a metal oxide. A conventional mastering bench may be used to define the precise tracking features included on the preformatted substrate layer. The techniques include inserting the master medium into a recording drive capable of accurately following the tracking features. The recording drive alters regions of the developable layer along the tracking features. The master medium is then removed from the recording drive and the altered regions are developed to define a surface pattern on the master medium. A replication process then creates a plurality of data storage media from the master medium.
摘要:
The invention is directed to coded optical media that allows a proprietary media handling system to enable particular drive features on an optical drive system. In particular, a coded optical medium comprises an otherwise standardized format optical medium that includes a particular set of preformatted manufacturer identification (MID) code values that can be read by the proprietary media handling system and compared with a set of internally preset code values. On the condition that the particular set of preformatted MID code values match the internally preset code values, the proprietary media handling system allows access to data stored on medium or, alternatively, enables special features. In this manner, the prerequisite code value match between the coded optical media and media handling system prevent non-certified media use in the optical drive system or, alternatively, enable specialized features only with optical media having accepted coding.
摘要:
Mastering techniques are described that can improve the quality of a master used in data storage disk manufacturing. In particular, the techniques can improve resolution of the features created on the master. The techniques include coating a master substrate layer with a tri-layer structure composed of a top photoresist layer, a bottom photoresist layer, and a non-resist layer interposed between the two photoresist layers. The bottom photoresist layer comprises a deep ultraviolet (DUV) resist material. Mastering the top photoresist layer defines a portable conformable mask (PCM) for the bottom photoresist layer. A variety of PCM may be defined for the bottom photoresist layer. The PCM may be defined using conventional tip recording with a focused laser spot that provides fine feature definition. A blanket DUV light may then illuminate the bottom photoresist layer through the PCM to provide enhanced feature resolution in a data storage disk master.
摘要:
The invention provides a dichroic coating for holographic media. The dichroic coating is substantially non-reflective of light at a first wavelength and substantially reflective of light at a second wavelength. A holographic recording material of the medium can be formulated to be sensitive to the first wavelength of light, but generally insensitive to the second wavelength. A probe beam at the second wavelength can be used to interrogate the medium and identify tracking features.