Journal article

Selective near-perfect absorbing mirror as a spatial frequency filter for optical image processing

Lukas Wesemann, Evgeniy Panchenko, Kalpana Singh, Enrico Della Gaspera, Daniel E Gomez, Timothy J Davis, Ann Roberts

APL PHOTONICS | AMER INST PHYSICS | Published : 2019

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 real-time, on-chip, all-optical spatial frequency filtering using a thin-film perfect absorber structure. We experimentally demonstrate edge enhancement of an amplitude image and conversion of phase gradients to intensity modulation in an image. The device is used to demonstrate enhancement of an image of pond algae.

Grants

Awarded by Australian Research Council


Funding Acknowledgements

Research funded by Australian Research Council Discovery Projects (Grant No. DP160100983) and Future Fellowship scheme (Grant No. FT140100514). This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF).