Spontaneous parametric down-conversion of photons at 660 nm to the terahertz and sub-terahertz frequency range

Haase, Björn; Kutas, Mirco; Riexinger, Felix; Bickert, Patricia; Keil, Andreas; Molter, Daniel; Bortz, Michael; Freymann, Georg von

doi:10.1364/oe.27.007458

Cited by 38 publications

(40 citation statements)

References 31 publications

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“…The detection bandwidth can be significantly improved, combined with a broadband photon-pair source [37,38]. The operating wavelength of QFTIR spectroscopy could be extended to the mid-and far-infrared regions by choosing a suitable nonlinear crystal as the photon-pair source [39][40][41][42]. Our method can be applied to a variety of quantum spectroscopy systems, such as those based on a Mach-Zehnder nonlinear interferometer, with minor modifications, and is also applicable for infrared hyperspectral imaging [43].…”

Section: Discussionmentioning

confidence: 99%

Quantum Fourier-Transform Infrared Spectroscopy for Complex Transmittance Measurements

et al. 2021

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Harnessing the quantum interference of the pair generation processes, infrared quantum spectroscopy, based on nonlinear interferometers with visible-infrared photon-pair sources, enables the extraction of the infrared optical properties of a sample through visible photon detection without the need for an infrared optical source or detector. We develop a theoretical framework for quantum Fourier-transform infrared (QFTIR) spectroscopy. The proposed Fourier analysis method, which fully utilizes the phase information in the interferogram, allows us to determine the complex transmittance and optical constants for a sample in a simple setup without the use of any dispersive optics for spectral selection. In the experimental demonstrations, the transmittance spectrum of a bandpass filter and the refractive index of silica glass are measured in the near-infrared region using QFTIR operated in a low gain regime; these results agree well with the independently measured spectrum using a conventional spectrometer and an value estimated from references. These demonstrations prove the validity and great potential of QFTIR spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Quantum Fourier-Transform Infrared Spectroscopy for Complex Transmittance Measurements

et al. 2021

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“…They efficiently reflect the pump photons while transmitting the down-and up-converted signal photons having a frequency that is slightly shifted. All volume Bragg gratings exceed an optical density of 4 at the design wavelength and transmit more than 90% already at a frequency shift of 0.1 THz (8). Spatial filters block divergent stray light originating from the VBGs.…”

Section: Experimental Designmentioning

confidence: 99%

“…Due to apertures of the wave plate and filters along the beam path, the spectrum shows a vertical limitation starting from a scattering angle at about 0.5 degrees. A more detailed description is given in a previous work (8).…”

Section: Frequency-angular Spectrummentioning

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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“…[] for a detailed discussion of long‐wavelength SPDC and candidate materials. A first attempt toward the THz regime was announced just recently …”

Section: Quantum Imaging Device Developmentmentioning

confidence: 99%

“…A first attempt toward the THz regime was announced just recently. [151] The generation of short-wavelength photons in the deep UV range poses an even bigger engineering challenge. At wavelengths below 350 nm currently used periodically poled nonlinear crystals such as ppKTP and ppLT become opaque.…”

Section: Source Developmentmentioning

confidence: 99%

Perspectives for Applications of Quantum Imaging

Basset

Setzpfandt

Steinlechner

et al. 2019

Laser & Photonics Reviews

110

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Quantum imaging is a multifaceted field of research that promises highly efficient imaging in extreme spectral ranges as well as ultralow‐light microscopy. Since the first proof‐of‐concept experiments over 30 years ago, the field has evolved from highly fascinating academic research to the verge of demonstrating practical technological enhancements in imaging and microscopy. Here, the aim is to give researchers from outside the quantum optical community, in particular those applying imaging technology, an overview of several promising quantum imaging approaches and evaluate both the quantum benefit and the prospects for practical usage in the near future. Several use case scenarios are discussed and a careful analysis of related technology requirements and necessary developments toward practical and commercial application is provided.

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Spontaneous parametric down-conversion of photons at 660 nm to the terahertz and sub-terahertz frequency range

Cited by 38 publications

References 31 publications

Quantum Fourier-Transform Infrared Spectroscopy for Complex Transmittance Measurements

Quantum Fourier-Transform Infrared Spectroscopy for Complex Transmittance Measurements

Terahertz quantum sensing

Perspectives for Applications of Quantum Imaging

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