A5022853742- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Analytical Chemistry and Sensors
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Chemical Sensor Technologies
- Spectroscopy and Quantum Chemical Studies
- Advanced Fiber Optic Sensors
- Optical Systems and Laser Technology
- Optical Polarization and Ellipsometry
- Atmospheric Ozone and Climate
- Mechanical and Optical Resonators
- Photonic Crystal and Fiber Optics
- Coffee research and impacts
- Extraction and Separation Processes
Pacific Northwest National Laboratory
2025
TU Wien
2022-2024
Munster Technological University
2024
University of Applied Sciences Technikum Wien
2023
Abstract Laser-based mid-infrared (mid-IR) photothermal spectroscopy (PTS) represents a selective, fast, and sensitive analytical technique. Recent developments in laser design permits the coverage of wider spectral regions combination with higher power, enabling for qualitative reconstruction broadband absorption features, typical liquid or solid samples. In this work, we use an external cavity quantum cascade (EC-QCL) that emits pulsed mode region between 5.7 6.4 µm (1770–1560 cm −1 ), to...
The extraction of critical metals, such as rare earth elements (REEs), from dilute feedstocks like geothermal brine, mine tailings, and produced water is crucial for advancing clean energy technologies sustainable manufacturing. However, the efficient separation REE ions these sources remains challenging due to their similar chemical properties complex interactions within mixtures. This study explores an electrohydrodynamic-based approach separating a feedstock containing competing cations...
We report on key developments made in advancing Interferometric Cavity-Assisted Photothermal Spectroscopy (ICAPS) toward a method for rugged and cost-effective gas sensing. In ICAPS, Fabry Perot Interferometer (FPI) is employed to transduce absorption induced analyte specific refractive index changes occurring inside the interferometer. Periodic excitation achieved by modulation of laser’s wavelength photothermal signal detected measuring intensity probe laser reflected FPI. Maximum...
We report on a mid-infrared (mid-IR) photothermal spectrometer for liquid-phase samples the detection of water in organic solvents, such as ethanol or chloroform, and complex mixtures, jet fuel. The is based Mach–Zehnder interferometer (MZI) employing He-Ne laser, mini-flow cell with two embedded channels placed interferometer's arms, tunable external cavity quantum cascade laser (EC-QCL) selective analyte excitation collinear arrangement. In this study, bending vibration spectral range...
Caffeine is the most widely consumed stimulant and subject of significant ongoing research discussions due to its impact on human health. The industry’s need comply with country-specific food beverage regulations underscores importance monitoring caffeine levels in commercial products. In this study, we propose an alternative technique for analysis that relies mid-infrared laser-based photothermal spectroscopy (PTS). PTS exploits high-power output quantum cascade laser (QCL) sources enhance...
Photothermal Spectroscopy (PTS) is an indirect analytical technique in which the optical signal directly proportional to laser emission intensity. This direct dependence on power means that - contrast more conventional transmission-absorption techniques PTS fully benefits from high of novel tunable mid-infrared sources such as Quantum Cascade Lasers (QCLs). In particular, QCLs equipped with external cavity (EC) allow broad tunability can be exploited detection liquids identified by...
We report on the design of an all-mirror wavefront-division interferometer capable spectroscopic studies across multiple spectral ranges-from plasma frequencies metals to terahertz wavelengths and beyond. The proposed method leverages properties laser sources with high spatial coherence. A theoretical framework for scheme is presented, along analytical solution determining far-field interference pattern, which validated through both optical propagation simulations experimental results....
In this contribution, we address the core of any Fourier transform (FT) spectrometer$\unicode{x2013}$the interferometer$\unicode{x2013}$in perspective recent emergence spatially coherent broadband infrared (IR) sources. As a result, report on design wavefront-division interferometer for spectroscopic applications in mid-IR and beyond. The theoretical framework proposed wavefront division is discussed, an analytical solution to determine far-field interference pattern derived. verified by...
For the first time, we demonstrate on-chip photothermal spectroscopy of a liquid phase sample, namely water in isopropanol and will show how this technique can be used to realize compact highly sensitive selective sensors for range analytes.
We report on the detection of nitric oxide using an Interferometric Cavity-Assisted Photothermal Spectroscopy (ICAPS) gas sensor in combination with a DFB-QCL emitting at 1900 cm<sup>-1</sup> as excitation source. In ICAPS, probe laser is coupled to Fabry-Perot interferometer acting optical transducer thermal effects. A wavelength modulation approach diode was employed, actively lock its point highest sensitivity and linearity interferometric fringe for stable readout. normalized noise...
The Fabry-Perot interferometer (FPI) can be used as a very effective optical transducer for thermal effects spectroscopically induced in gas sample. In Interferometric Cavity-Assisted Photothermal Spectroscopy (ICAPS) an FPI is employed sensing applications, combination with probe and excitation laser source. this work, locking scheme signal normalization method, both based on wavelength modulation, are reported employing near-infrared diode system response to was modeled the photothermal...