Ken E. Anderson

Realization of high-performance holographic data storage: the InPhase Technologies demonstration platform

An overview of the InPhase Technologies holographic demonstration platform is presented. This compact, mobile system is a fully functional holographic recordable drive complete with custom optics and custom control and channel electronics. The development of this device paves the way for the commercialization of this technology.

Arbitrary GRIN component fabrication in optically driven diffusive photopolymers

We introduce a maskless lithography tool and optically-initiated diffusive photopolymer that enable arbitrary two-dimensional gradient index (GRIN) polymer lens profiles. The lithography tool uses a pulse-width modulated deformable mirror device (DMD) to control the 8-bit gray-scale intensity pattern on the material. The custom polymer responds with a self-developing refractive index profile that is non-linear with optical dose. We show that this nonlinear material response can be corrected with pre-compensation of the intensity pattern to yield high fidelity, optically induced index profiles. The process is demonstrated with quadratic, millimeter aperture GRIN lenses, Zernike polynomials and GRIN Fresnel lenses.

New optical architecture for holographic data storage system compatible with Blu-ray Disc™ system

Abstract. A new optical architecture for holographic data storage system which is compatible with a Blu-ray Disc™ (BD) system is proposed. In the architecture, both signal and reference beams pass through a single objective lens with numerical aperture (NA) 0.85 for realizing angularly multiplexed recording. The geometry of the architecture brings a high affinity with an optical architecture in the BD system because the objective lens can be placed parallel to a holographic medium. Through the comparison of experimental results with theory, the validity of the optical architecture was verified and demonstrated that the conventional objective lens motion technique in the BD system is available for angularly multiplexed recording. The test-bed composed of a blue laser system and an objective lens of the NA 0.85 was designed. The feasibility of its compatibility with BD is examined through the designed test-bed.

How to Write Good Books

We introduce two novel techniques enabling media-efficient recording allowing for more pages per book and decreasing the disk space needed by each book. We present explanations and experimental results including our latest density results

M/# Requirements for Holographic Data Storage

Achievable density in holographic storage is limited by the M/# of the medium. By estimating geometry-dependent factors and signal strength requirements, we determine the M/# needed for a target density for collinear and angle-polytopic architectures

Arbitrary 2D GRIN lens fabrication in diffusive photopolymers

We introduce a new method to make gradient index (GRIN) lenses in diffusive photopolymers with nearly arbitrary two-dimensional (2D) profiles. By modulating the 2D intensity pattern and power of the exposure with a deformable mirror device (DMD), the index profile of the GRIN lens can be controlled. Combined with the self-developing nature of the photophotopolymer, rapid on-demand printing of arbitrary micro-optics is enabled. We demonstrate the process by fabricating quadratic GRIN lenses, Zernike polynomials and multi-focal lenses.

Multi-terabit/in2holographic data storage demonstration

We report on the demonstration of holographic data storage (HDS) at a raw areal bit density of 2.2 Tbit/in2. The demonstration was performed on a platform incorporating several new technical innovations. One key innovation – the coherent data channel – was successfully introduced ahead of schedule following encouraging early results. Issues of media recording efficiency and carrier wavefront demodulation for homodyne detection are discussed.

Multi-terabit/in 2 holographic data storage demonstration

We report on the demonstration of holographic data storage (HDS) at a raw areal bit density of 2.2 Tbit/in2. The demonstration was performed on a platform incorporating several new technical innovations. One key innovation – the coherent data channel – was successfully introduced ahead of schedule following encouraging early results. Issues of media recording efficiency and carrier wavefront demodulation for homodyne detection are discussed.

Progress toward the commercial realization of high performance holographic data storage

The promise of using volume holography to deliver high performance optical storage systems is at hand. The possibility of extremely large storage capacities and fast transfer rates make holographic storage ideal for high performance video applications. An overview of advances at InPhase Technologies is presented. Progress toward high-density implementations as well as the development of a functional prototype is presented. These systems are the first fully functional holographic recordable drives developed. Their development paves the way for the commercialization of this technology.