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Hyperspectral terahertz microscopy via nonlinear ghost-imaging

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posted on 2023-06-09, 20:21 authored by Luana OlivieriLuana Olivieri, Juan Sebastian Totero Gongora, Luke Peters, Vittorio Cecconi, Antonio CutronaAntonio Cutrona, Jacob Tunesi, Robyn Tucker, Alessia Pasquazi, Marco Peccianti
Ghost-imaging, based on single-pixel detection and multiple pattern illumination, is a crucial investigation tool in difficult-to-access wavelength regions. In the terahertz domain, where high-resolution imagers are mostly unavailable, Ghost-imaging is an optimal approach to embed the temporal dimension, creating a ‘hyperspectral’ imager. In this framework high-resolution is mostly out-of-reach. Hence, it is particularly critical to developing practical approaches for microscopy. Here we experimentally demonstrate Time-Resolved Nonlinear Ghost-Imaging, a technique based on near-field, optical-to-terahertz nonlinear conversion and detection of illumination patterns. We show how space-time coupling affects near-field time-domain imaging and we develop a complete methodology that overcomes fundamental systematic reconstruction issues. Our theoretical-experimental platform enables high-fidelity subwavelength imaging and carries relaxed constrains on the nonlinear generation crystal thickness. Our work establishes a rigorous framework to reconstruct hyperspectral images of complex samples inaccessible through standard fixed-time methods.

History

Publication status

  • Published

File Version

  • Published version

Journal

Optica

ISSN

2334-2536

Publisher

Optical Society of America

Issue

2

Volume

7

Page range

186-191

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Atomic, Molecular and Optical Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2020-01-23

First Open Access (FOA) Date

2020-02-24

First Compliant Deposit (FCD) Date

2020-01-22

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