High-resolution frequency-comb spectroscopy with electro-optic sampling and instantaneous octave-wide coverage across mid-IR to THz at a video rate DOI Creative Commons
Dmitrii Konnov,

Andrey Muraviev,

Sergey Vasilyev

et al.

APL Photonics, Journal Year: 2023, Volume and Issue: 8(11)

Published: Nov. 1, 2023

Ultrabroadband electro-optic sampling using few-optical-cycle probing pulses is a sensitive technique to detect electric field amplitudes with high dynamic range and up near-infrared optical frequencies. By combining this method dual-frequency-comb spectroscopy new class of ultrafast lasers, we perform high-resolution, 80 MHz/0.0027 cm−1 (10 MHz/0.0003 spectral interleaving), spectroscopic measurements in the frequency 1.5–45 THz (6.6–200 µm), excluding strongly absorbing Reststrahlen band lattice resonances at 4.5–9 THz, an instantaneous coverage exceeding octave (e.g., 9–22 μm). As driving source, use pair mutually coherent combs from Kerr-lens mode-locked solid-state Cr:ZnS (2.35 μm) lasers. One downconverted via intrapulse difference generation produce longwave “sensing” comb, while second comb doubled near-IR “probe” for (EOS). The low intensity phase noise our dual-comb system allow capturing large amount information (200 000 comb-mode-resolved lines spaced by MHz) mid-IR portion spectrum video rate 69 Hz, signal-to-noise ratio limited shot EOS balanced detection system. Our low-pressure gaseous ethanol, isoprene, dimethyl sulfide reveal Doppler-limited signatures that have never been explored before.

Language: Английский

Midinfrared Spectroscopic Analysis of Aqueous Mixtures Using Artificial-Intelligence-Enhanced Metamaterial Waveguide Sensing Platform DOI

Jingkai Zhou,

Zixuan Zhang, Bowei Dong

et al.

ACS Nano, Journal Year: 2022, Volume and Issue: 17(1), P. 711 - 724

Published: Dec. 28, 2022

As miniaturized solutions, mid-infrared (MIR) waveguide sensors are promising for label-free compositional detection of mixtures leveraging plentiful absorption fingerprints. However, the quantitative analysis liquid is still challenging using MIR sensors, as spectrum overlaps multiple organic components accompanied by strong water background. Here, we present an artificial-intelligence-enhanced metamaterial sensing platform (AIMWSP) aqueous mixture in MIR. With sensitivity-improved and assistance machine learning, spectra a ternary can be successfully distinguished decomposed to single-component predicting concentration. A classification accuracy 98.88% 64 mixing ratios 92.86% four concentrations below limit (972 ppm, based on 3σ) with steps 300 ppm realized. Besides, concentration prediction root-mean-squared error varying from 0.107 vol % 1.436 also achieved. Our work indicates potential further extending this spectrometer-on-chip aiming data analytics environments.

Language: Английский

Citations

41
Laser-based sensing in the long-wavelength mid-infrared: chemical kinetics and environmental monitoring applications DOI
Ali Elkhazraji, Mohammad Khaled Shakfa,

Nawaf Abualsaud

et al.

Applied Optics, Journal Year: 2023, Volume and Issue: 62(6), P. A46 - A46

Published: Jan. 9, 2023

We present chemical kinetics and environmental monitoring applications in the long-wavelength mid-infrared (LW-MIR) region using a new diagnostic that exploits widely tunable light source emitting LW-MIR. The custom-designed laser is based on difference-frequency generation (DFG) process nonlinear orientation-patterned GaAs crystal. pump laser, an external-cavity quantum cascade tuned continuous-wave (cw) mode, while signal CO2 gas operated pulsed mode with kilohertz repetition rate. idler wavelength can be between 11.58 (863.56cm-1) 15.00 µm (666.67cm-1) quasi-cw manner. discuss unique prospective offered by probing LW-MIR for environment-monitoring applications. showcase potential of DFG some representative

Language: Английский

Citations

25
Ultraflexible Wireless Imager Integrated with Organic Circuits for Broadband Infrared Thermal Analysis DOI Creative Commons
Rei Kawabata, Kou Li, Teppei Araki

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(15)

Published: Jan. 12, 2024

Flexible imagers are currently under intensive development as versatile optical sensor arrays, designed to capture images of surfaces and internals, irrespective their shape. A significant challenge in developing flexible is extending detection capabilities encompass a broad spectrum infrared light, particularly terahertz (THz) light at room temperature. This advancement crucial for thermal biochemical applications. In this study, imager using uncooled carbon nanotube (CNT) sensors organic circuits. The CNT sensors, fabricated on ultrathin 2.4 µm substrates, demonstrate enhanced sensitivity across wide range, spanning from near-infrared THz wavelengths. Moreover, they retain characteristics bending crumpling. design incorporates light-shielded transistors circuits, functioning reliably irradiation, amplifies signals by factor 10. integration both shielded into an 8 × active-sensor matrix within the enables sequential imaging nondestructive assessment heat sources in-liquid chemicals through wireless communication systems. proposed imager, offering unique functionality, shows promise applications analysis soft robotics.

Language: Английский

Citations

11
Electric-Field Molecular Fingerprinting to Probe Cancer DOI Creative Commons
Kosmas V. Kepesidis, Philip Jacob,

Wolfgang Schweinberger

et al.

ACS Central Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 9, 2025

Human biofluids serve as indicators of various physiological states, and recent advances in molecular profiling technologies hold great potential for enhancing clinical diagnostics. Leveraging developments laser-based electric-field fingerprinting, we assess its vitro In a proof-of-concept study involving 2533 participants, conducted randomized measurement campaigns to spectroscopically profile bulk venous blood plasma across lung, prostate, breast, bladder cancer. Employing machine learning, detected infrared signatures specific therapy-naïve cancer distinguishing them from matched control individuals with cross-validation ROC AUC 0.88 lung values ranging 0.68 0.69 the other three entities. an independent held-out test data set, designed reflect different experimental conditions those used during model training, achieved detection 0.81. Our demonstrates that fingerprinting is robust technological framework broadly applicable disease phenotyping under real-world conditions.

Language: Английский

Citations

1
Time-resolved mid-infrared dual-comb spectroscopy DOI Creative Commons
M. A. Abbas,

Qing Pan,

Julien Mandon

et al.

Scientific Reports, Journal Year: 2019, Volume and Issue: 9(1)

Published: Nov. 21, 2019

Abstract Dual-comb spectroscopy can provide broad spectral bandwidth and high resolution in a short acquisition time, enabling time-resolved measurements. Specifically, the mid-infrared wavelength range is of particular interest, since most molecules have their strongest rotational-vibrational transitions this “fingerprint” region. Here we report dual-comb spectroscopy, covering ~300 nm around 3.3 μm with 6 GHz 20 μs temporal resolution. As demonstration, study CH 4 /He gas mixture an electric discharge, while discharge modulated between dark glow regimes. We simultaneously monitor production C 2 H vibrational excitation molecules, observing dynamics both processes. This approach to broadband, high-resolution, provides new tool for monitoring kinetics fast chemical reactions, potential applications various fields such as physical chemistry plasma/combustion analysis.

Language: Английский

Citations

63
Fourier transform infrared spectroscopy with visible light DOI Creative Commons
Chiara Lindner, Sebastian Wolf, Jens Kießling

et al.

Optics Express, Journal Year: 2020, Volume and Issue: 28(4), P. 4426 - 4426

Published: Jan. 23, 2020

Nonlinear interferometers allow spectroscopy in the mid-infrared range by detecting correlated visible light, for which non-cooled detectors with higher specific detectivity and lower dark count rates are available. We present a new approach registration of spectral information, combines nonlinear interferometer using non-degenerate spontaneous parametric down-conversion (SPDC) Fourier-transform concept. In order to increase coverage, we use broadband non-collinear SPDC periodically poled LiNbO3. Without need spectrally selective detection, continuous spectra bandwidth more than 100 cm-1 achieved. demonstrate transmission polypropylene sample measured 6 resolution between 3.2 µm 3.9 µm.

Language: Английский

Citations

62
Broadband molecular spectroscopy with optical frequency combs DOI Creative Commons
Marissa L. Weichman, P. Bryan Changala, Jun Ye

et al.

Journal of Molecular Spectroscopy, Journal Year: 2018, Volume and Issue: 355, P. 66 - 78

Published: Nov. 27, 2018

Language: Английский

Citations

61
Mid-Infrared Frequency Comb Generation and Spectroscopy with Few-Cycle Pulses and χ(2) Nonlinear Optics DOI Creative Commons

Alexander J. Lind,

Abijith S. Kowligy,

Henry Timmers

et al.

Physical Review Letters, Journal Year: 2020, Volume and Issue: 124(13)

Published: April 1, 2020

Mid-infrared laser frequency combs are compelling sources for precise and sensitive metrology with applications in molecular spectroscopy spectro-imaging. The infrared atmospheric window between 3-5.5 $\mu$m particular provides vital information regarding composition. Using a robust, fiber-optic source of few-cycle pulses the near-infrared, we experimentally demonstrate ultra-broad bandwidth nonlinear phenomena including harmonic difference generation single pass through periodically poled lithium niobate (PPLN). These $\chi^{(2)}$ optical processes result across mid-infrared which employ dual-comb acetone carbonyl sulfide resolution as high 0.003 cm$^{-1}$. Moreover, cascaded nonlinearities same PPLN directly provide carrier-envelope offset near-infrared driving pulse train compact geometry.

Language: Английский

Citations

58
Photo-acoustic dual-frequency comb spectroscopy DOI Creative Commons
Thibault Wildi, Thibault Voumard, Victor Brasch

et al.

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Aug. 20, 2020

Abstract Photo-acoustic spectroscopy (PAS) is one of the most sensitive non-destructive analysis techniques for gases, fluids and solids. It can operate background-free at any wavelength applicable to microscopic even non-transparent samples. Extension PAS broadband coverage a powerful tool, though challenging implement without sacrifice resolution acquisition speed. Here we show that dual-frequency comb (DCS) its potential unmatched precision, speed be combined with advantages photo-acoustic detection. Acoustic wave interferograms are generated in sample by dual-comb absorption detected microphone. As an example, weak gas features precisely rapidly sampled; long-term coherent averaging further increases sensitivity. This novel approach (DCPAS) generates unprecedented opportunities rapid multi-species molecular across all wavelengths light.

Language: Английский

Citations

57
Open‐Path Dual‐Comb Spectroscopy for Multispecies Trace Gas Detection in the 4.5–5 µm Spectral Region DOI
Fabrizio R. Giorgetta, Jeff Peischl, Daniel I. Herman

et al.

Laser & Photonics Review, Journal Year: 2021, Volume and Issue: 15(9)

Published: June 30, 2021

Abstract Open‐path dual‐comb spectroscopy provides multispecies atmospheric gas concentration measurements with high precision. Here, open‐path is extended to the mid‐infrared 5 µm window, enabling retrievals of primary greenhouse gases, N 2 O, CO , and H as well criteria air pollutants O 3 across 600 m km round‐trip paths. Measurements are demonstrated over a five‐day period at min temporal resolution 80% uptime. The achieved precision sufficient resolve variations multiple species; retrieved dry mixing ratios in good agreement colocated point sensor. In addition, ratio excess versus agrees similar urban studies but disagrees US National Emission Inventory by factor 3. exhibits plume‐dependent value, indicating variability sources O.

Language: Английский

Citations

41