A5032219430- Spectroscopy and Laser Applications
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Chemical Sensor Technologies
- Laser Design and Applications
- Spectroscopy and Chemometric Analyses
- Plasma Applications and Diagnostics
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Water Quality Monitoring and Analysis
- ZnO doping and properties
- Mass Spectrometry Techniques and Applications
- Biomedical and Engineering Education
- Postharvest Quality and Shelf Life Management
- Mechanical and Optical Resonators
- Transition Metal Oxide Nanomaterials
- Electronic and Structural Properties of Oxides
- Atmospheric and Environmental Gas Dynamics
- Semiconductor Lasers and Optical Devices
- Spectroscopy Techniques in Biomedical and Chemical Research
- Atmospheric Ozone and Climate
- Plant Physiology and Cultivation Studies
Radboud Institute for Molecular Life Sciences
2018-2024
Radboud University Medical Center
2018-2024
Radboud University Nijmegen
2018-2024
Kharazmi University
2015
We present a fast-scanning Fourier transform spectrometer (FTS) in combination with high-repetition-rate mid-infrared supercontinuum sources, covering wavelength range of 2–10.5 µm. demonstrate the performance for trace gas detection and compare various methods: baseband single photodetector, balanced detection, synchronous demodulation at repetition rate source. The FTS uses off-the-shelf optical components provides minimum spectral resolution 750 MHz. It achieves noise equivalent...
Recent advancements of mid-infrared (MIR) supercontinuum light sources have opened up new possibilities in laser-based trace gas sensing.While the inherently support wide spectral coverage, detection broadband absorption signals with high speed and low cost is traditionally limited by MIR detector arrays.In this work, we demonstrate that limitation can be circumvented upconverting signal into near-infrared (NIR) region, where cost-effective silicon-based arrays utilized to measure...
We present a multi-species trace gas sensor based on high-repetition-rate mid-infrared supercontinuum source, in combination with 30 m multipass absorption cell, and scanning grating spectrometer. The output of the spectrometer is demodulated by digital lock-in amplifier, referenced to repetition rate source. This improved detection sensitivity system factor 5, as compared direct baseband operation. provides spectral coverage 950 cm −1 (between 2.85-3.90 µm) resolution 2.5 100 ms. It can...
We present a fully integrated and transportable multi-species trace gas sensor based on mid-infrared (MIR) supercontinuum light source. The high brightness (surpassing synchrotron) ultra-broad spectral bandwidth (2–4 μm) of this source allows simultaneous detection multiple broadband absorbing species. High sensitivity in the sub-ppmv level has been achieved by utilizing an astigmatic multipass cell. A grating-based spectrometer at scanning rate 20 Hz is developed employing balanced scheme....
Abstract Broadband mid-infrared (MIR) spectroscopy is a well-established and valuable diagnostic technique for reactive plasmas. Plasmas are complex systems consist of numerous (reactive) types molecules; it challenging to measure control reaction specificity with good sensitivity. Here, we demonstrate the first use novel MIR supercontinuum (SC) source quantitative plasma spectroscopy. The SC has wide spectral coverage 1300–2700 cm −1 (wavelength range 3.7–7.7 μm), thus enabling broadband...
We present a multi-species trace gas sensor based on fast, compact home-built Fourier transform spectrometer (FTS) combined with broadband mid-infrared supercontinuum (SC) source. The covers the spectral bandwidth of SC source (2 - 4 µm) and provides best resolution 1 GHz in 6 seconds. It has detection sensitivity few hundred ppbv Hz -1/2 for different species. study performance developed terms precision, linearity, long-term stability, detection. use measuring fruit-produced volatiles under...
Abstract Photonics technologies play a crucial role in driving technological advancements within the agrifood industry, aiming to deliver sustainable food and agriculture, offering healthy, nutritious safe for all of us. Particularly, optical sensors imaging systems, together with machine-learning processing advanced lighting, pivotal monitoring crop soil health unprecedented precision, while safeguarding supply chain. This roadmap aims provide an overview state-of-the-art photonics...
Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved with a good spectral temporal resolution. Here, we present mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband resolution 5 GHz (0.18 nm at wavelength 3333 nm), 20 μs, total coverage over 300 cm−1 time ~70 s. We used the dual-comb...
In this letter, we investigated Ti (20 nm)/Al (30 nm)/Au (60 nm) metallic contacts to Al-doped ZnO thin films prepared by the sol-gel method. order measure specific contact resistance, circular transfer length method structures were patterned on samples a lithography process. The annealed at different temperatures and electrical characterization (I-V) was performed. annealing process optimized produce ohmic with lowest resistance. results showed that sample 350°C had resistance of ~3.7 × 10...
Highly responsive ZnO-based photoconductors with a circular electrode scheme are introduced in this paper. Some cost-effective samples were fabricated through simple chemical routes and conventional photolithography methods. Al:ZnO thin films high density of hole trap states prepared after several optimizations during the synthesis process. Circular electrodes low ohmic contact resistances formed by optimizing metallization Then, prototypes analyzed their specifications measured. Performance...
Conventional mechanical Fourier Transform Spectrometers (FTS) are able to simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times achieve time-resolved with a good spectral temporal resolution. Here, we present mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband resolution 5 GHz, 20 μs, total time few minutes. We used the dual-comb spectrometer monitor reaction dynamics...
We present mid-infrared trace gas sensing based on a supercontinuum source combined with direct absorption spectroscopy and sum-frequency upconversion, showing broadband detection 10-4 Hz-1/2 noise equivalent absorbance sensitivity.
Recent advancement in compact, stable, and broadband mid-infrared supercontinuum (SC) sources has provided attractive scientific industrial applications metrology, sensing, communications [1]. The wide spectral coverage the so-called molecular fingerprint region is main advantage of such SC sources, opening up new opportunities for efficient multi-species trace gas detection at short time scale. Presently, there a lack sensitive, low-cost, uncooled MIR photodetectors. alternative approach...
We present a home-built Fourier transform spectrometer based on two mid-infrared supercontinuum sources with spectral coverage between 1.4 - 7.5 μm for CH 4 plasma analysis and CO 2 /N product analysis.
A broadband mid-infrared gas sensor using a supercontinuum light source is developed for simultaneous multispecies detection. We present the journey from laboratory setup towards market-ready prototype application in fruit storage facilities.
We present our recent results in the development of mid-infrared spectroscopy systems based on supercontinuum sources for two different field applications: airborne monitoring atmospheric pollutants and quality control agricultural products.
The detection of gas-phase molecular species at low concentration levels is an attractive research field, supporting a wide variety industrial, environmental, and biological applications. Among various types methods, mid-infrared (MIR) laser absorption spectroscopy provides unique opportunity for selective sensitive by targeting the characteristic spectral patterns in so-called MIR fingerprint region.
We present a mid-infrared supercontinuum-based trace gas sensor. A lock-in technique is applied to enhance the signal-to-noise ratio by over an order of magnitude, achieving sensitivity ~10 ppbv Hz -1/2 for detection methane.
We present a transportable, multi-species, trace gas sensor using high repetition rate mid-infrared supercontinuum source in combination with lock-in amplifier, achieving tens of ppbv·Hz -1/2 detection sensitivity for multiple species.
We present a multi-species trace gas sensor based on broadband mid-infrared absorption spectroscopy as well its application to measure fruit-produced volatiles under different atmospheric conditions, demonstrating potential for monitoring fruit storage rooms.