Results 61 to 70 of about 3,951 (191)

On-chip mid-infrared photothermal spectroscopy using suspended silicon-on-insulator microring resonators [PDF]

, 2016
Mid-infrared spectroscopic techniques rely on the specific "fingerprint" absorption lines of molecules in the mid-infrared band to detect the presence and concentration of these molecules.
Baets, Roel, Kuyken, Bart, Malik, Aditya, Muneeb, Muhammad, Roelkens, Günther, Vasiliev, Anton   +5 more
core   +3 more sources

Single-tube on-beam quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2016
Quartz-enhanced photoacoustic spectroscopy (QEPAS) with a single-tube acoustic microresonator (AmR) inserted between the prongs of a custom quartz tuning fork (QTF) was developed, investigated, and optimized experimentally. Due to the high acoustic coupling efficiency between the AmR and the QTF, the single-tube on-beam QEPAS spectrophone configuration
Zheng, Huadan, Dong, Lei, Sampaolo, Angelo, Wu, Hongpeng, Patimisco, Pietro, Yin, Xukun, Ma, Weiguang, Zhang, Lei, Yin, Wangbao, SPAGNOLO, Vincenzo Luigi, Jia, Suotang, Tittel, Frank K.   +11 more
openaire   +5 more sources

Hydrogen Halide Gas Sensors: Active Materials, Operation Principles, and Emerging Technologies

Interdisciplinary Materials, EarlyView.
This review considers hydrogen halide (HX) gas sensors across functional materials and principles: acoustic, chemical, optical and nanophotonic. The strong acidity and reactivity of HX gases are discussed as constraints for stability and selectivity of these devices.
Xiuzhen Liu, Nikita Tukachev, Kehang Wang, Dmirty Zhirihin, Yaopeng Cheng, Pavel Krasnov, Mingzhao Song, Soslan Khubezhov, Wenping Yin, Emmanuel Stratakis, Sailing He, Andrey L. Rogach, Sergey Makarov   +12 more
wiley   +1 more source

Folded-optics-based quartz-enhanced photoacoustic and photothermal hybrid spectroscopy

Photoacoustics
Folded-optics-based quartz-enhanced photoacoustic and photothermal hybrid spectroscopy (FO-QEPA-PTS) is reported for the first time. In FO-QEPA-PTS, the detection of the photoacoustic and photothermal hybrid signal is achieved through the use of a custom
Ruyue Cui, Hongpeng Wu, Frank K. Tittel, Vincenzo Spagnolo, Weidong Chen, Lei Dong   +5 more
doaj   +1 more source

Terahertz Photoacoustic Spectroscopy Using an MEMS Cantilever Sensor [PDF]

, 2014
In this paper, a microelectromechanical systems cantilever sensor was designed, modeled, and fabricated to measure the photoacoustic (PA) response of gases under very low vacuum conditions.
Coutu, Ronald A., Jr., Giauvitz, Nathan E., Medvedev, Ivan R., Petkie, Douglas T.   +3 more
core   +1 more source

Quartz Tuning Fork Resonance Tracking and application in Quartz Enhanced Photoacoustics Spectroscopy [PDF]

Sensors, 2019
The quartz tuning fork (QTF) is a piezoelectric transducer with a high quality factor that was successfully employed in sensitive applications such as atomic force microscopy or Quartz-Enhanced Photo-Acoustic Spectroscopy (QEPAS). The variability of the environment (temperature, humidity) can lead to a drift of the QTF resonance.
Rousseau, Roman, Maurin, Nicolas, Trzpil, Wioletta, Bahriz, Michaël, Vicet, Aurore   +4 more
openaire   +3 more sources

Microfabricated Neural Biosensors for Detection of Neurotransmitters, Biomarkers, and Small Molecules: Emerging Trends on Self‐Sustained Systems and Energy Harvesting

Advanced Sensor Research, Volume 5, Issue 1, January 2026.
This paper reviews the state of the art and recent developments in thin‐film biosensors for the detection of neurotransmitters, small molecules, and biomarkers within flexible, implantable bioelectronic systems. It covers the main sensing modalities, including electrochemical, plasmonic, acoustic, and magnetic, alongside their materials, transduction ...
Massimo Mariello
wiley   +1 more source

Visible‐Light Photoswitchable Covalent Tetra‐Ortho‐Fluoro‐Azobenzene Carbon Nanodot Hybrids for Optostimulation

ChemPhotoChem, Volume 9, Issue 12, December 13, 2025.
Tetra‐ortho‐fluoroazobenzene hybrids bound to carbon nanodots (CNDs) are prepared by covalent amide coupling. These show reversible switching between trans and cis using visible light (448 nm/530 nm), while retaining emission. The hybrids are nontoxic to cells and enable optical stimulation and offering potential for advanced light‐controlled ...
Paul P. Debes, Dominic Schatz, Anthea Villano, Yagmur Aydogan‐Sun, Juan Pablo Martínez, Michal Langer, Janis Hessling, Monika Schönhoff, Bernd M. Smarsly, Silvio Osella, Josef Wachtveitl, Maria Rosa Antognazza, Giuseppe M. Paternò, Teresa Gatti, Hermann A. Wegner   +14 more
wiley   +1 more source

Front-End Amplifiers for Tuning Forks in Quartz Enhanced PhotoAcoustic Spectroscopy

Applied Sciences, 2020
A study of the front-end electronics for quartz tuning forks (QTFs) employed as optoacoustic transducers in quartz-enhanced photoacoustic spectroscopy (QEPAS) sensing is reported.
Giansergio Menduni, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Stefano Dello Russo, Andrea Zifarelli, Arianna Elefante, Piotr Z. Wieczorek, Tomasz Starecki, Vittorio M. N. Passaro, Frank K. Tittel, Vincenzo Spagnolo   +11 more
doaj   +1 more source

Broadband detection of methane and nitrous oxide using a distributed-feedback quantum cascade laser array and quartz-enhanced photoacoustic sensing

Photoacoustics, 2020
Here we report on the broadband detection of nitrous oxide (N2O) and methane (CH4) mixtures in dry nitrogen by using a quartz-enhanced photoacoustic (QEPAS) sensor exploiting an array of 32 distributed-feedback quantum cascade lasers, within a spectral ...
Marilena Giglio, Andrea Zifarelli, Angelo Sampaolo, Giansergio Menduni, Arianna Elefante, Romain Blanchard, Christian Pfluegl, Mark F. Witinski, Daryoosh Vakhshoori, Hongpeng Wu, Vittorio M.N. Passaro, Pietro Patimisco, Frank K. Tittel, Lei Dong, Vincenzo Spagnolo   +14 more
doaj   +1 more source