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Heat Assisted Magnetic Recording

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The shift towards a knowledge-based economy is resulting in an ever increasing quantity of information that must be stored, and conventional hard disk technology is under increasing strain to meet the demand for increased storage capacity.  That continued demand for higher capacity and faster information storage media has triggered worldwide research activity into new design concepts to realize ultrahigh density storage devices.

 

In turn, those design concepts employ optical storage media like holographic media, optical read/write capabilities including delivering of optical signals via state-of-the-art optical pick-up designs, utilizing optical signals to achieve heat-assisted magnetic recording, or developing optical characterization and processing methods to identify and repair defects, conduct failure analysis, or fabricate and characterize optical media.  These optical design, analysis, fabrication and characterization steps require sophisticated and flexible optical simulation tools to understand the role of imperfections and design variables on data storage media and system performance.

 

Features: FDTD is a high performance optical solver that can accurately capture the effects of wavelength-scale features, and is ideal for simulating the use of near field transducers for achieving the small spot size (under the diffraction limit) required for HAMR. FDTD can also be used to simulate the light delivery from the laser into the condensor optics.

Construct arbitrary 3D geometry

Use Lumerical’s multi-coefficient materials to accurately model highly dispersive materials such as metals.

Use a total field/scattered field source to calculate the absorption and scattering cross section of a particle.

Use a fully vectorial far field calculator to determine the amount of light scattered into various regions of the far field.

Lumerical’s conformal mesh technology can provide sub-mesh cell modeling accuracy important for resolving the shape of wavelength and sub-wavelength scale geometry

Built-in parameter sweep and optimization algorithms make it easy to analyze and optimize parameterized designs

 

 

Features: MODE can be used to design the wave guiding portion of optical system in order to deliver light efficiently to the recording head, with the optimal spot size.

Built-in Eigenmode mode solver makes it easy to calculate the physical properties of guided modes, such as the mode profiles, effective index, propagation constant, propagation loss, dispersion, bending loss, group velocity, group dispersion

Use the 2.5D variational FDTD solver or the eigenmode expansion (EME) solver to quickly optimize tapered waveguide.

Application examples

Solvers

Description

FDTD

Coupling with external source: Grating coupler

varFDTD, EME

Wave guide: Tapered waveguide

FDTD

Transducer: Nanoscale ridge aperture and Plasmon antenna

FDTD, EME, varFDTD

Complete HAMR optical system: Optical HAMR system

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