Terahertz nonlinear ghost imaging via plane decomposition: Toward near-field micro-volumetry
Terahertz time-domain imaging targets the reconstruction of the full electromagnetic morphology of an object. In this spectral range, the near-field propagation strongly affects the information in the space-time domain in items with microscopic features. While this often represents a challenge, as the information needs to be disentangled to obtain high image fidelity, here we show that such a phenomenon can enable three-dimensional microscopy. Specifically, we investigate the capability of the time-resolved nonlinear ghost imaging (TNGI) methodology to implement field-sensitive micro-volumetry by plane decomposition. We leverage the temporally-resolved, field-sensitive detection to ‘refocus’ an image plane at an arbitrary distance from the source, which defines the near-field condition, and within a microscopic sample. Since space-time coupling rapidly evolves and diffuses within subwavelength length scales, our technique can separate and discriminate the information originating from different planes at different depths. Our approach is particularly suitable for objects with sparse micrometric details. Building upon this principle, we demonstrate complex, time-domain volumetry resolving internal object planes with sub-wavelength resolution, discussing the range of applicability of our technique.
Funding
Industrial Pathway to Micro-Comb Lasers
Engineering and Physical Sciences Research Council
Find out more...The Leverhulme Trust (Early Career Fellowship ECF-2020-537 and Early Career Fellowship ECF-2022-710)
History
School
- Science
Department
- Physics
Published in
ACS PhotonicsVolume
10Issue
6Pages
1726-1734Publisher
American Chemical SocietyVersion
- VoR (Version of Record)
Rights holder
© The AuthorsPublisher statement
This is an Open Access Article. It is published by the American Chemical Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/Acceptance date
2023-02-24Publication date
2023-03-10Copyright date
2023eISSN
2330-4022Publisher version
Language
- en