Photothermal spectroscopy
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Quartz-tuning-fork enhanced photothermal spectroscopy for ultra-high sensitive trace gas detection Open
A gas sensing method based on quartz-tuning-fork enhanced photothermal spectroscopy (QEPTS) is reported in this paper. Unlike usually used thermally sensitive elements, a sharply resonant quartz-tuning-fork with the capability of enhanced …
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Dual-comb photothermal spectroscopy Open
Dual-comb spectroscopy (DCS) has revolutionized optical spectroscopy by providing broadband spectral measurements with unprecedented resolution and fast response. Photothermal spectroscopy (PTS) with a pump-probe configuration offers a hig…
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Thermal Spectroscopy, Photothermal Spectroscopy, Thermal Microspectroscopy, Photothermal Microspectroscopy, Thermal Macrospectroscopy and Photothermal Macrospectroscopy Comparative Study on Malignant and Benign Human Cancer Cells and Tissues with the Passage of Time under Synchrotron Radiation Open
In the current study, we have experimentally and comparatively investigated and compared malignant human cancer cells and tissues before and after irradiating of synchrotron radiation using Thermal Spectroscopy, Photothermal Spectroscopy, …
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Quantitative Chemical Analysis at the Nanoscale Using the Photothermal Induced Resonance Technique Open
Photothermal induced resonance (PTIR), also known as AFM-IR, is a scanning probe technique that provides sample composition information with a lateral resolution down to 20 nm. Interest in PTIR stems from its ability to identify unknown sa…
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Quartz-enhanced photoacoustic-photothermal spectroscopy for trace gas sensing Open
A trace gas detection technique of quartz-enhanced photoacoustic-photothermal spectroscopy (QEPA-PTS) is demonstrated. Different from quartz-enhanced photoacoustic spectroscopy (QEPAS) or quartz-enhanced photothermal spectroscopy (QEPTS), …
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On-Chip Mid-Infrared Photothermal Spectroscopy Using Suspended Silicon-on-Insulator Microring Resonators Open
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. Despite being very sensitive and selective, bulky …
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Photothermal CO detection in a hollow-core negative curvature fiber Open
We demonstrate the first, to the best of our knowledge, photothermal carbon monoxide (CO) sensor using a hollow-core negative curvature fiber. The hollow-core fiber features a typical structure of one ring cladding containing eight nontouc…
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Balanced-detection interferometric cavity-assisted photothermal spectroscopy Open
An optical cavity can be utilized as an excellent transducer for highly sensitive gas detection with the application of photothermal spectroscopy, featuring the beneficial property of an ultra-low absorption volume within a rugged sensing …
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A Review of Photothermal Detection Techniques for Gas Sensing Applications Open
Photothermal spectroscopy (PTS) is a technique used for determining the composition of liquids, solids and gases. In PTS, the sample is illuminated with a radiation source, and the thermal response of the analyte (e.g., refractive index) i…
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Multi-pass cell-assisted photoacoustic/photothermal spectroscopy of gases using quantum cascade laser excitation and heterodyne interferometric signal detection Open
A heterodyne interferometer-based signal retrieval in photoacoustic/photothermal gas spectrometer using mid-infrared quantum cascade laser excitation is demonstrated. This new method for all-optical photoacoustic/photothermal signal detect…
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Broadband near-field infrared spectromicroscopy using photothermal probes and synchrotron radiation Open
In this paper, we experimentally demonstrate the use of infrared synchrotron radiation (IR-SR) as a broadband source for photothermal near-field infrared spectroscopy. We assess two methods of signal transduction; cantilever resonant therm…
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MIR-Pump NIR-Probe Fiber-Optic Photothermal Spectroscopy With Background-Free First Harmonic Detection Open
We demonstrated MIR-pump NIR-probe photothermal spectroscopy with the first harmonic (PTS-1f) detection of formaldehyde, one of the most common volatile organic compounds (VOCs), in a silica hollow-core negative curvature fiber (HC-NCF). T…
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Photothermal spectroscopy of CO<sub>2</sub> in an intracavity mode-locked fiber laser configuration Open
A novel configuration of a photothermal gas sensor is demonstrated. Photothermal-induced gas refractive index (RI) modulation is probed by a simple, mode-locked (ML) ring cavity fiber laser, operating in the 1.55 µm wavelength region. The …
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Balanced-detection interferometric cavity-assisted photothermal spectroscopy employing an all-fiber-coupled probe laser configuration Open
The interferometric cavity-assisted photothermal spectroscopy (ICAPS) method has been proven highly suitable for sensitive and compact gas detection by application of an optical cavity as transducer for photothermal spectroscopy. This work…
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Photothermal spectroscopy: A promising tool for nanofluids Open
In recent years, the demand for more efficient cooling circuits has resulted in active studies of nanofluids, two-component liquids consisting of a base fluid, and dispersed nanoparticles with high thermal conductivity. From the viewpoint …
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Biological imaging with nonlinear photothermal microscopy using a compact supercontinuum fiber laser source Open
Nonlinear photothermal microscopy is applied in the imaging of biological tissues stained with chlorophyll and hematoxylin. Experimental results show that this type of organic molecules, which absorb light but transform dominant part of th…
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Understanding and Controlling Spatial Resolution, Sensitivity, and Surface Selectivity in Resonant-Mode Photothermal-Induced Resonance Spectroscopy Open
Photothermal-induced resonance (PTIR) is increasingly used in the measurement of infrared absorption spectra of submicrometer objects. The technique measures IR absorption spectra by relying on the photothermal effect induced by a rapid pu…
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Extreme thermal anisotropy in high-aspect-ratio titanium nitride nanostructures for efficient photothermal heating Open
High optical absorptivity or a large absorption cross-section is necessary to fully utilize the irradiation of light for photothermal heating. Recently, titanium nitride (TiN) nanostructures have been demonstrated to be robust optical abso…
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Submicron-resolution polymer orientation mapping by optical photothermal infrared spectroscopy Open
A submicron-resolution infrared spectroscopy technique called optical photothermal infrared (O-PTIR) spectroscopy was applied to polymer orientation analysis in this work by measuring the wall cross-section of a commercial plastic bottle. …
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Photothermal gas detection using a miniaturized fiber Fabry-Perot cavity Open
We demonstrate a robust and miniaturized fiber Fabry-Perot cavity-based sensor for photothermal spectroscopic signal retrieval. The proof-of-concept experiment involved the use of a near-infrared pump laser to detect methane molecules on a…
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The study of frequency-scan photothermal reflectance technique for thermal diffusivity measurement Open
A frequency scan photothermal reflectance technique to measure thermal diffusivity of bulk samples is studied in this manuscript. Similar to general photothermal reflectance methods, an intensity-modulated heating laser and a constant inte…
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Noninvasive assessment of skin structure by combined photothermal radiometry and optical spectroscopy: coregistration with multiphoton microscopy Open
We are combining two optical techniques, pulsed photothermal radiometry (PPTR) and diffuse reflectance spectroscopy (DRS), for noninvasive assessment of the structure and composition of human skin in vivo. The analysis involves simultaneou…
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Photothermal, photocarrier, and photoluminescence phenomena in semiconductors studied using spectrally resolved modulated infrared radiometry: Physics and applications Open
Photothermal, photocarrier, and photoluminescence phenomena in semiconductors studied using modulated infrared (IR) radiometry are discussed. Spectrally resolved measurements are carried out using IR filters placed in front of the detector…
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Predictive model for the quantitative analysis of human skin using photothermal radiometry and diffuse reflectance spectroscopy Open
We have recently introduced a novel methodology for the noninvasive analysis of the structure and composition of human skin in vivo . The approach combines pulsed photothermal radiometry (PPTR), involving time-resolved measurements of mid-…
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Structural evaluation of ions-implanted GaN films by photothermal deflection spectroscopy Open
We characterize the behavior caused by thermal annealing for C, O, Si and Mg ions implanted in GaN films by photothermal deflection spectroscopy (PDS) with respect to structural disorder and defect levels related to yellow luminescence. Al…
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New photothermal deflection technique to discriminate between heating and cooling Open
Photothermal deflection spectroscopy (PDS) is a highly sensitive and precise technique that is used to measure the optical absorption and thermal characteristics of a sample. While most applications of PDS utilize a heating beam, laser coo…
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Quartz-Enhanced Photothermal-Acoustic Spectroscopy for Trace Gas Analysis Open
A crystal quartz tuning fork (QTF) was used as a detector to collect and amplify laser-induced photoacoustic and photothermal waves simultaneously for trace chemical analysis. A wavelength modulation technique was applied to the proposed q…
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Photothermal spectroscopy and micro/nanofluidics Open
Photothermal spectroscopy, a remarkable detection method that can analyze microscale objects in a noninvasive and nondestructive manner, has been successfully coupled with micro/nanofluidic devices. Specifically, methods that employ a ther…
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Photopyroelectric spectroscopy and calorimetry Open
In this Tutorial, we present an overview of the development of the photopyroelectric (PPE) technique from its beginning in 1984 to the present day. The Tutorial is organized into five sections, which explore both theoretical and experiment…
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Wavelength modulated diode probe laser for an interferometric cavity-assisted photothermal spectroscopy gas sensor Open
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, a Fabry Perot Interferometer (FPI) is employed to transd…