Shift-invariant real-time edge-enhanced VanderLugt correlator using video-rate compatible photorefractive polymer

A. Heifetz*, G. S. Pati, J. T. Shen, J. K. Lee, M. S. Shahriar, C. Phan, M. Yamamoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We demonstrated a real-time shift-invariant VanderLugt correlator (VLC). The VLC was implemented with a 37 μm thick bis-triarylamine side-chain polymer matrix photorefractive (PR) poisoner composite operating at 532 nm wavelength. Correlation selectivity was enhanced by real-time edge enhancement. The advantage of the VLC is that its architecture allows overcoming the PR material response speed. A correlator of this type enables a fast shift-invariant search of a large optical image database. A high degree of shift invariance in our correlator was possible because of the material thickness. The angular bandwidth of this material was measured experimentally in a degenerate four-wave mixing setup, and it was found to be in a very good agreement with the theory.

Original languageEnglish (US)
Pages (from-to)6148-6153
Number of pages6
JournalApplied optics
Volume45
Issue number24
DOIs
StatePublished - Aug 20 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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