Five-dimensional imaging with a coded pinhole array

V. Anand; S. H. Ng; J. Maksimovic; D. Linklater; T. Katkus; S. Lundgaard; E. P. Ivanova; S. Juodkazis

doi:10.1117/12.2577123

5 March 2021 Five-dimensional imaging with a coded pinhole array

V. Anand, S. H. Ng, J. Maksimovic, D. Linklater, T. Katkus, S. Lundgaard, E. P. Ivanova, S. Juodkazis

Proceedings Volume 11696, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIV; 1169606 (2021) https://doi.org/10.1117/12.2577123
Event: SPIE OPTO, 2021, Online Only

Abstract

A five-dimensional imaging technique to resolve objects in three-dimensional space, spectrum and time has been developed using a single diffractive optical element consisting of a quasi-random array of pinholes. The object space and spectrum were sampled by axially scanning a point object with different wavelengths along the optical axis and recording the corresponding spatio-spectral signatures. The recorded spatio-spectral signatures were catalogued and stored in a library. A thick object emitting light at different wavelengths was placed in the object space within the axial boundaries of the library and illuminated by light sources within the spectral boundaries of the spatio-spectral library and a single object intensity pattern was recorded. The spatio-spectral images of the object were reconstructed by processing the object intensity pattern and the spatio-spectral library in the computer. Depth-wavelength reciprocity was exploited to see colour from depth and depth from colour. A computational approach utilizing the scaling factors in image formation was used to synthesize the spatio-spectral signatures. The application of depth-wavelength reciprocity and the synthesis of spatio-spectral signatures accelerated the training procedure leading to a faster multidimensional multispectral imaging technology in comparison to the existing coded aperture holography techniques. The developed technology was implemented for spatio-spectral-temporal imaging of a fast transient event such as a spark with a temporal resolution of 40 μs. A single camera shot of the spark recorded by a monochrome high-speed camera was converted into intensity cube data along depth for different wavelengths.

Conference Presentation

Citation Download Citation

V. Anand, S. H. Ng, J. Maksimovic, D. Linklater, T. Katkus, S. Lundgaard, E. P. Ivanova, and S. Juodkazis "Five-dimensional imaging with a coded pinhole array", Proc. SPIE 11696, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIV, 1169606 (5 March 2021); https://doi.org/10.1117/12.2577123

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