Classical imaging with undetected light

Cardoso, António; Berruezo, L. P.; Ávila, D. F.; Lemos, Gabriela Barreto; Pimenta, W. M.; Monken, C. H.; Saldanha, Pablo L.; Pádua, S.

doi:10.1103/physreva.97.033827

Cited by 34 publications

(27 citation statements)

References 31 publications

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“…Therefore, the paths are indistinguishable and the photons interfere. On the other hand, also classical interpretations exist to explain the effect (16)(17)(18). The quantum mechanical interpretations (3,5,15) were tailored to SPDC processes.…”

Section: Discussionmentioning

confidence: 99%

Terahertz quantum sensing

et al. 2020

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Quantum sensing is highly attractive for accessing spectral regions in which the detection of photons is technically challenging: sample information is gained in the spectral region of interest and transferred via biphoton correlations into another spectral range, for which highly sensitive detectors are available. This is especially beneficial for terahertz radiation, where no semiconductor detectors are available and coherent detection schemes or cryogenically cooled bolometers have to be employed. Here, we report on the first demonstration of quantum sensing in the terahertz frequency range in which the terahertz photons interact with a sample in free space and information about the sample thickness is obtained by the detection of visible photons. As a first demonstration, we show layer thickness measurements with terahertz photons based on biphoton interference. As non-destructive layer thickness measurements are of high industrial relevance, our experiments might be seen as a first step towards industrial quantum sensing applications.

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Section: Discussionmentioning

confidence: 99%

Terahertz quantum sensing

et al. 2020

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“…With this demonstration, a new hyperspectral IR microscopy will be unlocked for practical applications in bioimaging and material analysis. We should also mention the possibility of implementing the method in high gain (43) or stimulated (44,45) regimes of PDC, which is an exciting topic for further investigations.…”

Section: Discussionmentioning

confidence: 99%

Hyperspectral infrared microscopy with visible light

et al. 2020

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Hyperspectral microscopy is an imaging technique that provides spectroscopic information with high spatial resolution. When applied in the relevant wavelength region, such as in the infrared (IR), it can reveal a rich spectral fingerprint across different regions of a sample. Challenges associated with low efficiency and high cost of IR light sources and detector arrays have limited its broad adoption. Here, we introduce a new approach to IR hyperspectral microscopy, where the IR spectral map is obtained with off-the-shelf components built for visible light. The method is based on the nonlinear interference of correlated photons generated via parametric down-conversion. In this proof-of-concept we demonstrate the chemical mapping of a patterned sample, where different areas have distinctive IR spectroscopic fingerprints. The method provides a wide field of view, fast readout, and negligible heat delivered to the sample, which opens prospects for its further development for applications in material and biological studies.

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“…Related measuring techniques allow observation (imaging) at wavelength ranges different from those of the absorption of targeted objects ("imaging with undetected photons" [1,4], referred to as "UP-imaging" in the following) offering serious advantages, e.g., in infrared imaging important in medical, industrial or forensic applications (e.g., cancer diagnostics) [6]. Although recent works have shown that imaging with undetected photons is possible also by "classical" light [7], [8], original works utilizing quantum mechanical principles remained in the focus of interest [9], [10]. These methods are based on the generation of nondegenerate, correlated (entangled) photon pairs of different wavelengths in nonlinear media, by the method of optical parametric down-conversion.…”

Section: Introductionmentioning

confidence: 99%

Biological Microscopy with Undetected Photons

et al. 2020

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Novel imaging techniques utilizing nondegenerate, correlated photon pairs sparked intense interest during the last couple of years among scientists of the quantum optics community and beyond. It is a key property of such "ghost imaging" or "quantum interference" methods that they use those photons of the correlated pairs for imaging that never interacted with the sample, allowing detection in a spectral range different from that of the illumination of the object. Extensive applications of these techniques in spectroscopy and microscopy are envisioned, however, their limited spatial resolution to date has not yet supported real-life microscopic investigations of tiny biological objects. Here we report a modification of the method based on quantum interference by using a seeding laser and confocal scanning, that allows the improvement of the resolution of imaging with undetected photons by more than an order of magnitude, and we also present examples of application in the microscopy of biological samples.

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Classical imaging with undetected light

Cited by 34 publications

References 31 publications

Terahertz quantum sensing

Terahertz quantum sensing

Hyperspectral infrared microscopy with visible light

Biological Microscopy with Undetected Photons

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