title: Shift-invariant real-time edge-enhanced VanderLugt correlator using video-rate compatible photorefractive polymer.
abstract: We demonstrated a real-time shift-invariant VanderLugt correlator (VLC). The VLC was implemented with a 37 microm thick bis-triarylamine side-chain polymer matrix photorefractive (PR) polymer 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.
authors.affiliation: Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, USA. heifetz@ece.northwestern.edu
authors.forename: A
authors.initials: A
authors.lastname: Heifetz
authors.forename: G S
authors.initials: GS
authors.lastname: Pati
authors.forename: J T
authors.initials: JT
authors.lastname: Shen
authors.forename: J-K
authors.initials: JK
authors.lastname: Lee
authors.forename: M S
authors.initials: MS
authors.lastname: Shahriar
authors.forename: C
authors.initials: C
authors.lastname: Phan
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto