Mid-infrared upconversion imaging using femtosecond pulses

Ashik, A. S.; O’Donnell, Callum F.; Kumar, S. Chaitanya; Ebrahim-Zadeh, M.; Tidemand-Lichtenberg, Peter; Pedersen, Christian

doi:10.1364/prj.7.000783

Cited by 28 publications

(9 citation statements)

References 24 publications

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“…Here, the pulse duration of the pump pulse is optimized at the femtosecond regime, which significantly improves the depth resolution in comparison to previous demonstrations with picosecond pulses 40 , 41 , 46 . On the other hand, the walk-off effect within the nonlinear crystal becomes more prominent for shorter pulses 44 , 45 , which may reduce the conversion efficiency as a trade-off. As discussed in Supplementary Note 2 , the pulse parameters used in our experiment ensure a negligible efficiency reduction below 3%.…”

Section: Resultsmentioning

confidence: 99%

Mid-infrared single-photon 3D imaging

Fang

Huang

et al. 2023

Light Sci Appl

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Active mid-infrared (MIR) imagers capable of retrieving three-dimensional (3D) structure and reflectivity information are highly attractive in a wide range of biomedical and industrial applications. However, infrared 3D imaging at low-light levels is still challenging due to the deficiency of sensitive and fast MIR sensors. Here we propose and implement a MIR time-of-flight imaging system that operates at single-photon sensitivity and femtosecond timing resolution. Specifically, back-scattered infrared photons from a scene are optically gated by delay-controlled ultrashort pump pulses through nonlinear frequency upconversion. The upconverted images with time stamps are then recorded by a silicon camera to facilitate the 3D reconstruction with high lateral and depth resolutions. Moreover, an effective numerical denoiser based on spatiotemporal correlation allows us to reveal the object profile and reflectivity under photon-starving conditions with a detected flux below 0.05 photons/pixel/second. The presented MIR 3D imager features high detection sensitivity, precise timing resolution, and wide-field operation, which may open new possibilities in life and material sciences.

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Section: Resultsmentioning

confidence: 99%

Mid-infrared single-photon 3D imaging

Fang

Huang

et al. 2023

Light Sci Appl

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“…Notably, the resonance of the ITO NC monolayers can be aligned with telecom band wavelengths, 36 enabling all-optical switches for optical communications, 38 where the reduced thickness of the perfectly absorbing monolayers could help enhance the speed and lower the power consumption of the switching process. Furthermore, the ultrathin nature and the transparency of our ITO NC layers to near IR and visible light suggests that high harmonics, which can be efficiently generated by mid-IR perfectly absorbing systems, would be able to effectively escape the material, 66 with potential applications to imaging 67 and quantum information processing. 68 On the other hand, the linear absorption properties demonstrated already in this work are ideally suited for advanced detector design, with the significant advantage of wavelength output tuning in ultrathin layers offering benefits for applications such as bolometric detection.…”

Section: Discussionmentioning

confidence: 99%

Wavelength Tunable Infrared Perfect Absorption in Plasmonic Nanocrystal Monolayers

Chang,

Sakotic,

Ware

et al. 2023

ACS Nano

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The ability to efficiently absorb light in ultrathin (subwavelength) layers is essential for modern electro-optic devices, including detectors, sensors, and nonlinear modulators. Tailoring these ultrathin films’ spectral, spatial, and polarimetric properties is highly desirable for many, if not all, of the above applications. Doing so, however, often requires costly lithographic techniques or exotic materials, limiting scalability. Here we propose, demonstrate, and analyze a mid-infrared absorber architecture leveraging monolayer films of nanoplasmonic colloidal tin-doped indium oxide nanocrystals (ITO NCs). We fabricate a series of ITO NC monolayer films using the liquid–air interface method; by synthetically varying the Sn dopant concentration in the NCs, we achieve spectrally selective perfect absorption tunable between wavelengths of two and five micrometers. We achieve monolayer thickness-controlled coupling strength tuning by varying NC size, allowing access to different coupling regimes. Furthermore, we synthesize a bilayer film that enables broadband absorption covering the entire midwave IR region (λ = 3–5 μm). We demonstrate a scalable platform, with perfect absorption in monolayer films only hundredths of a wavelength in thickness, enabling strong light–matter interaction, with potential applications for molecular detection and ultrafast nonlinear optical applications.

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“…Beginning from the perspective of classical nonlinear optics, a polarization field is induced in the medium that has a nonlinear relationship with applied electric field [39], [40] P = 𝜀 0 [︁ 𝜒 (1) : E + 𝜒 (2) : EE + 𝜒 (3) : EEE + . .…”

Section: Adjoint Optimization Of Sfgmentioning

confidence: 99%

High-efficiency sum frequency generation from inverse designed metasurfaces

Li,

Zhang,

Neshev

et al. 2023

Active Photonic Platforms (APP) 2023

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Sum frequency generation is the process in which two incoming photons are converted into an outgoing photon of higher energy. This process is highly inefficient, and therefore requires either large interaction distances in bulky crystals, or large field concentrations in the non-linear materials. Metasurfaces are one such platform to generate extreme field enhancements with resonant processes. In this work, we use topology optimisation to design metasurfaces that exhibit increase high efficiency sum frequency generation, as well as the ability to tailor the generated polarisation.

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Mid-infrared upconversion imaging using femtosecond pulses

Cited by 28 publications

References 24 publications

Mid-infrared single-photon 3D imaging

Mid-infrared single-photon 3D imaging

Wavelength Tunable Infrared Perfect Absorption in Plasmonic Nanocrystal Monolayers

High-efficiency sum frequency generation from inverse designed metasurfaces

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