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Wei Liu

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Publications de Wei Liu | EPFL Graph Search

Diffraction from deformed volume holograms: perturbation theory approach

Demetri Psaltis, Wei Liu

We derive the response of a volume grating to arbitrary small deformations, using a perturbative approach. This result is of interest for two applications: (a) when a deformation is undesirable and one seeks to minimize the diffracted field's sensitivity t ...

2005

Volume holographic hyperspectral imaging

Demetri Psaltis, Wei Liu

A volume hologram has two degenerate Bragg-phase-matching dimensions and provides the capability of volume holographic imaging. We demonstrate two volume holographic imaging architectures and investigate their imaging resolution, aberration, and sensitivit ...

2004

Volume holographic grating-based continuously tunable optical filter

Demetri Psaltis, Wei Liu

We propose and demonstrate a widely tunable optical filter, realized by angle tuning a volume holographic grating. The volume holographic grating selectively drops a narrow portion of the signal bandwidth into a fiber while passing through the rest of the ...

2004

Optical memory for computing and information processing

Demetri Psaltis, Wei Liu

The high data transfer rate achievable in page-oriented optical memories demands for parallel interfaces to logic circuits able to process efficiently the data. The Optically Programmable Gate Array, an enhanced version of a conventional FPGA, utilizes a h ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa1999

Pixel size limit in holographic memories

Demetri Psaltis, Wei Liu

The bandwidth of holographic recording in LiNbO3 (Fe doped) in the 90 degrees geometry is studied theoretically and experimentally. The wide holographic bandwidth of LiNbO3 makes it possible to record submicrometer pixels and reconstruct them by phase conj ...

1999

The pixel size limit for a holographic memory system

Demetri Psaltis, Wei Liu

Compact holographic memory architecture with phase conjugate readout and diffraction suppression by internal reflection is investigated. The pixel size requirement for a competitive system is determined. The bandwidth of the holographic recording in LiNbO3 ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa1999

Holographic random access memory (HRAM)

Demetri Psaltis, Wei Liu

WE examine the present state of holographic random access memory (HRAM) systems and address the primary challenges that face this technology, specifically size, speed, and cost. We show that a fast HRAM system can be implemented with a compact architecture ...

1999

Holographic memory design for a petaflop superconducting computer architecture

Demetri Psaltis, Wei Liu

We will describe the role of holographic memory in a current research effort(1) that seeks to combine various advanced technologies to achieve petaflops scale computing within the next decade. In addition to holographic memory, the petaflop architecture co ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa1998