A plasmonic system is disclosed. The system includes at least one polarizer that is configured to provide at least one linearly polarized broadband light beam, an anisotropic plasmonic metasurface (APM) assembly having a plurality of nanoantennae each having a predetermined orientation with respect to a global axis representing encoded digital data, the APM assembly configured to receive the at least one linearly polarized broadband light beam and by applying localized surface plasmon resonance reflect light with selectable wavelengths associated with the predetermined orientations of the nanoantennae, and at least one analyzer that is configured to receive the reflected light with selectable wavelength, wherein the relative angles between each of the at least one analyzers and each of the at least one polarizers are selectable with respect to the global axis, thereby allowing decoding of the digital data.

A plasmonic system is disclosed. The system includes at least one polarizer that is configured to provide at least one linearly polarized broadband light beam, an anisotropic plasmonic metasurface (APM) assembly having a plurality of nanoantennae each having a predetermined orientation with respect to a global axis representing encoded digital data, the APM assembly configured to receive the at least one linearly polarized broadband light beam and by applying localized surface plasmon resonance reflect light with selectable wavelengths associated with the predetermined orientations of the nanoantennae, and at least one analyzer that is configured to receive the reflected light with selectable wavelength, wherein the relative angles between each of the at least one analyzers and each of the at least one polarizers are selectable with respect to the global axis, thereby allowing decoding of the digital data.

In an information recording/playback device adopting multi-value recording, a configuration to limit the size of marks to be recorded on a recording medium only to a predetermined size equal to or smaller than a beam spot size to enable prevention and reduction of crosstalk and crosswrite is implemented. A recording pulse generation unit configured to generate a recording pulse based on a multi-value modulation data, and a data recording unit configured to record the mark on the recording medium on the basis of the recording pulse are included. The data recording unit executes recording processing of setting sizes of all of marks to be recorded on the recording medium to a size equal to or smaller than a spot size at a half (½) level of a maximum value (Pmax) of a two-dimensional light intensity distribution (power profile) of a beam spot, and executes data recording processing of forming recording regions in modes having different densities of recording marks according to the levels of the multi-value modulation data.

A system for determining angular displacement, velocity and acceleration of a rotating member axially mounted to a platform including at least one digital storage disk having data stored concentrically thereon, the disk and rotating member having the same axis of rotation, at least one laser transmitter for emitting a laser beam directed towards the disk, at least one laser receiver for receiving a reflected portion of the emitted laser beam, at least one processor, and at least one memory storing software thereon for determining the angular displacement, velocity and acceleration of the rotating member. A method for determining the angular displacement, velocity and acceleration of the rotating member is also provided.

A system for determining angular displacement, velocity and acceleration of a rotating member axially mounted to a platform including at least one digital storage disk having data stored concentrically thereon, the disk and rotating member having the same axis of rotation, at least one laser transmitter for emitting a laser beam directed towards the disk, at least one laser receiver for receiving a reflected portion of the emitted laser beam, at least one processor, and at least one memory storing software thereon for determining the angular displacement, velocity and acceleration of the rotating member. A method for determining the angular displacement, velocity and acceleration of the rotating member is also provided.

A data storage device is disclosed comprising a head actuated over a recording medium, wherein the head comprises a laser configured to heat the recording medium. A mode hop map is generated for a write power applied to the laser during a write operation. The write power is applied to the laser during the write operation and the write power is adjusted in response to the mode hop map.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.

A data storage drive includes a servo loop for positioning a head over a disc. The servo loop includes a sensor, located in the head, that senses servo information located on the disc and produces a servo signal therefrom. The servo signal is combined with a reference signal to produce a raw position error signal (PES). The servo loop further also at least one phase-matching disturbance attenuation (PMDA) filter that receives the raw PES as an input and responsively outputs a vibration-cancellation signal, which, when combined with the raw PES, cancels vibration-induced disturbance from the raw PES, thereby producing a refined PES. A servo controller receives the refined PES and responsively produces a servo control signal. An actuator moves the head in response to receiving the servo control signal.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.