title: Improved data search by zero-order (dc) peak filtering in a defocused volume holographic content-addressable memory.
abstract: Defocusing the recording material away from the Fourier plane is necessary to reduce the strong dc component and produce a more homogeneous object beam distribution in the hologram plane in volume holographic digital data-storage systems with amplitude-modulated data pages. However, content-addressable searching with defocused recording results in higher cross-correlation peak intensities. We present a method for performing a faithful content-addressable search in a defocused volume holographic data-storage system. A new dc-filtered content-addressable search method for defocused volume holographic data-storage systems with binary data pages is demonstrated. Both simulation and experimental results are presented. The experimental results show good discrimination capability and confirm the feasibility of the proposed technique.
authors.affiliation: Photonics Group, Department of Physics, Indian Institute of Technology Delhi, New Delhi-16, India. bhargab.das@gmail.com
authors.forename: Bhargab
authors.initials: B
authors.lastname: Das
authors.forename: Joby
authors.initials: J
authors.lastname: Joseph
authors.forename: Kehar
authors.initials: K
authors.lastname: Singh