Near-perfect absorber as a subwavelength thickness spatial frequency filter for optical image processing
Optics
2019-02-18 v1
Abstract
Spatial frequency filtering is a fundamental enabler of information processing methods in biological and technical imaging. Most filtering methods, however, require either bulky and expensive optical equipment or some degree of computational processing. Here we experimentally demonstrate on-chip, all-optical spatial frequency filtering using a thin-film perfect absorber structure. We give examples of edge enhancement in an amplitude image as well as conversion of a phase gradient in a wave field into an intensity modulation.
Cite
@article{arxiv.1902.05674,
title = {Near-perfect absorber as a subwavelength thickness spatial frequency filter for optical image processing},
author = {Lukas Wesemann and Evgeniy Panchenko and Kalpana Singh and Enrico Della Gaspera and Daniel E. Gomez and Timothy J. Davis and Ann Roberts},
journal= {arXiv preprint arXiv:1902.05674},
year = {2019}
}
Comments
9 pages, 7 figures