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Photonics
Special Issues
Modern Spectroscopic Techniques for Trace Detection
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Modern Spectroscopic Techniques for Trace Detection

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 6834

Special Issue Editors

Dr. Hongming Yi

E-Mail Website
Guest Editor
Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, USA
Interests: spectroscopic techniques development and the applications in trace species detection; including cavity ring-down spectroscopy; cavity-enhanced spectroscopy; photoacoustic spectroscopy; frequency/wavelength modulation spectroscopy; frequency comb spectroscopy; optical fiber-based techniques; laser frequency stabilization; optical methodology
Special Issues, Collections and Topics in MDPI journals
Dr. Amir Khodabakhsh

E-Mail Website
Guest Editor
Institute of Molecules and Materials Radboud University Heyendaalseweg 135, room 01-733, 6525AJ Nijmegen, The Netherlands
Interests: optical frequency comb spectroscopy; cavity enhanced spectroscopy; broadband spectroscopy techniques frequency modulation spectroscopy; laser-based trace gas detection; laser stabilization techniques

Special Issue Information

Dear Colleagues,

Development and applications of advanced spectroscopic techniques have become a hot topic in recent years. With the emergence of the novel light sources from ultraviolet to the far-infrared region, such as quantum cascade lasers, interband cascade lasers, diode lasers, light emitting diodes, optical frequency combs, supercontinuum sources and so on, modern spectroscopy (for example, cavity ring down/enhanced spectroscopy, frequency/wavelength modulation spectroscopy, photoacoustic spectroscopy, and frequency comb/dual comb spectroscopy) have realized selective, interference-free, and real-time measurements with high sensitivities of sub-ppbv (10-9) levels and fast time responses down to a few microseconds (µs). These sensitive and real-time/time-resolved spectroscopic techniques can be applied to measure trace gases, atmospheric aerosols, isotopologues and free radicals, so as to study high-resolution molecule spectroscopy, vertical atmospheric profiles, atmospheric chemistry, chemical reaction dynamics, flux or eddy covariances, breath analysis and other open scientific questions. The existing spectroscopic techniques have obtained remarkable achievements in both instrument development and applications, but they still face unresolved issues. Nevertheless, higher sensitivity, better temporal resolution, longer stability, and long-term reproducibility, as well as novel methods and new attractive application areas, are the permanent challenges for the development of spectroscopic techniques.

In this Special Issue, we focus on the recent progress in the development of advanced spectroscopy techniques and their applications. Our goal is to report and summarize the latest research and developments in the updated theory, better measurement, and new applications for existing or new spectroscopic techniques.

We are looking forward to your contributions (reviews as well as original research papers).

Dr. Hongming Yi
Dr. Amir Khodabakhsh
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • cavity ring down/enhanced absorption spectroscopy
  • frequency/wavelength modulation spectroscopy
  • photoacoustic spectroscopy
  • frequency comb/dual comb spectroscopy
  • quantum/interband cascade laser (Q/ICL)-based spectroscopy
  • diode laser/light-emitting diode-based spectroscopy
  • microstructured optical fiber-based spectroscopy
  • high-sensitivity trace species detection
  • high-resolution molecular spectroscopy
  • time-resolved spectroscopy

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Published Papers (2 papers)

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Research

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17 pages, 2446 KiB  
Article
Absolute Absorption Cross-Section of the Ã←X˜ Electronic Transition of the Ethyl Peroxy Radical and Rate Constant of Its Cross Reaction with HO2
by Cuihong Zhang, Mirna Shamas, Mohamed Assali, Xiaofeng Tang, Weijun Zhang, Laure Pillier, Coralie Schoemaecker and Christa Fittschen
Photonics 2021, 8(8), 296; https://doi.org/10.3390/photonics8080296 - 24 Jul 2021
Cited by 10 | Viewed by 3243
Abstract
The absolute absorption cross-section of the ethyl peroxy radical C2H5O2 in the Ã←X˜ electronic transition with the peak wavelength at 7596 cm−1 has been determined by the method of dual wavelengths time resolved continuous wave [...] Read more.
The absolute absorption cross-section of the ethyl peroxy radical C2H5O2 in the Ã←X˜ electronic transition with the peak wavelength at 7596 cm−1 has been determined by the method of dual wavelengths time resolved continuous wave cavity ring down spectroscopy. C2H5O2 radicals were generated from pulsed 351 nm photolysis of C2H6/Cl2 mixture in presence of 100 Torr O2 at T = 295 K. C2H5O2 radicals were detected on one of the CRDS paths. Two methods have been applied for the determination of the C2H5O2 absorption cross-section: (i) based on Cl-atoms being converted alternatively to either C2H5O2 by adding C2H6 or to hydro peroxy radicals, HO2, by adding CH3OH to the mixture, whereby HO2 was reliably quantified on the second CRDS path in the 2ν1 vibrational overtone at 6638.2 cm−1 (ii) based on the reaction of C2H5O2 with HO2, measured under either excess HO2 or under excess C2H5O2 concentration. Both methods lead to the same peak absorption cross-section for C2H5O2 at 7596 cm−1 of σ = (1.0 ± 0.2) × 10−20 cm2. The rate constant for the cross reaction between of C2H5O2 and HO2 has been measured to be (6.2 ± 1.5) × 10−12 cm3 molecule−1 s−1. Full article
(This article belongs to the Special Issue Modern Spectroscopic Techniques for Trace Detection)
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Review

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22 pages, 2777 KiB  
Review
Cavity-Enhanced Frequency Comb Vernier Spectroscopy
by Chuang Lu, Jerome Morville, Lucile Rutkowski, Francisco Senna Vieira and Aleksandra Foltynowicz
Photonics 2022, 9(4), 222; https://doi.org/10.3390/photonics9040222 - 28 Mar 2022
Cited by 5 | Viewed by 3023
Abstract
Vernier spectroscopy is a frequency comb-based technique employing optical cavities for filtering of the comb and for enhancement of the interaction length with the sample. Depending on the ratio of the cavity free spectral range and the comb repetition rate, the cavity transmits [...] Read more.
Vernier spectroscopy is a frequency comb-based technique employing optical cavities for filtering of the comb and for enhancement of the interaction length with the sample. Depending on the ratio of the cavity free spectral range and the comb repetition rate, the cavity transmits either widely spaced individual comb lines (comb-resolved Vernier spectroscopy) or groups of comb lines, called Vernier orders (continuous-filtering Vernier spectroscopy, CF-VS). The cavity filtering enables the use of low-resolution spectrometers to resolve the individual comb lines or Vernier orders. Vernier spectroscopy has been implemented using various near- and mid-infrared comb sources for applications ranging from trace gas detection to precision spectroscopy. Here, we present the principles of the technique and provide a review of previous demonstrations of comb-resolved and continuous-filtering Vernier spectroscopy. We also demonstrate two new implementations of CF-VS: one in the mid-infrared, based on a difference frequency generation comb source, with a new and more robust detection system design, and the other in the near-infrared, based on a Ti:sapphire laser, reaching high sensitivity and the fundamental resolution limit of the technique. Full article
(This article belongs to the Special Issue Modern Spectroscopic Techniques for Trace Detection)
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