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Crystals
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Investgation of Molecular by Terahertz Spectroscopy
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Investgation of Molecular by Terahertz Spectroscopy

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (30 April 2021) | Viewed by 8905

Special Issue Editor

Prof. Dr. Seung Jae Oh

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Guest Editor
YUMS-KRIBB Medical Convergence Research Institute, College of Medicine, Yonsei University, Seoul 120-752, Republic of Korea
Interests: terahertz biomedical imaging; femtosecond laser biomedical optics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Terahertz spectroscopy has been regarded as a powerful technique to investigate molecular dynamics. Terahertz frequency, whose energy level is in the region of meV and several tens of cm of wavenumbers, lies between the microwave and the infrared regions of the electromagnetic spectrum. This frequency region covers molecular collective motion energies such as rotational, translational, and vibrational motions, as well as hydrogen bond energy. Particularly, the hydration dynamics of molecules has been investigated using THz frequency because the weak binding energy of water is in this frequency region. Thus, it is very useful when it comes to studying the phenomenon of binding biomolecules to water. Based on the nature of terahertz, lots of spectroscopy studies have been carried out in polymer, crystals, biochemical materials, food, aqueous materials, and semiconductors.

We invite researchers to contribute to this Special Issue on the Investigation of Molecules via Terahertz Spectroscopy, which is intended to serve as a unique multidisciplinary forum covering broad aspects of science, technology, and the application of spectroscopy studies of molecules using terahertz frequency waves.

Potential topics include but are not limited to the following:

- Terahertz spectroscopy technology

- Terahertz spectroscopic imaging

- Polymer

- Biochemical materials

- Food chemical

- Aqueous materials

- Water dynamics

- Semiconductor

Prof. Dr. Seung Jae Oh
Guest Editor

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. Crystals 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 2100 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

  • Terahertz spectroscopy technology
  • Terahertz spectroscopic imaging
  • Biochemical
  • materials
  • Food chemical
  • Polymer
  • Semiconductor
  • Aqueous material
  • Water

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Published Papers (3 papers)

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Research

7 pages, 1876 KiB  
Article
Characterization of Proton-Irradiated Polyaniline Nanoparticles Using Terahertz Thermal Spectroscopy
by Seung Jae Oh, Yoochan Hong, Ki-Young Jeong, Inhee Maeng, Jin-Suck Suh, Jaemoon Yang and Yong-Min Huh
Crystals 2021, 11(7), 765; https://doi.org/10.3390/cryst11070765 - 30 Jun 2021
Cited by 3 | Viewed by 1860
Abstract
In this study, we investigated the changes in the molecular structure of polyaniline (PANI) nanoparticles illuminated by a proton beam using terahertz (THz) thermal spectroscopy based on the terahertz time-domain spectroscopy technique. PANI nanoparticles in water were exposed to a proton beam of [...] Read more.
In this study, we investigated the changes in the molecular structure of polyaniline (PANI) nanoparticles illuminated by a proton beam using terahertz (THz) thermal spectroscopy based on the terahertz time-domain spectroscopy technique. PANI nanoparticles in water were exposed to a proton beam of 35 MeV energy with a particle fluence of 1013 particles/cm2. The photothermal properties of this solution of PANI nanoparticles were characterized using THz thermal spectroscopy. We measured the changes in the amplitudes of the reflected THz pulses to identify the variations in temperature induced by the photothermal effects of the PANI nanoparticle solution. The amplitude of a reflected THz pulse of the PANI solution not exposed to the proton beam increased when illuminated by an infrared light source, whereas that of THz signals of the PANI solution exposed to the proton beam hardly exhibited any changes. This implies that the molecular structure of PANI nanoparticles can be varied by a proton beam with a particle fluence above 1013 particles/cm2. Full article
(This article belongs to the Special Issue Investgation of Molecular by Terahertz Spectroscopy)
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18 pages, 7565 KiB  
Article
Measuring Complex Refractive Indices of a Nanometer-Thick Superconducting Film Using Terahertz Time-Domain Spectroscopy with a 10 Femtoseconds Pulse Laser
by Hyoung-Taek Lee, Gang-Seon Ji, Jun-Yung Oh, Choong-Won Seo, Byeong-Won Kang, Kyung-Wan Kim and Hyeong-Ryeol Park
Crystals 2021, 11(6), 651; https://doi.org/10.3390/cryst11060651 - 8 Jun 2021
Cited by 7 | Viewed by 3939
Abstract
Superconducting thin films are widely applied in various fields, including switching devices, because of their phase transition behaviors in relation to temperature changes. Therefore, it is important to quantitatively determine the optical constant of a superconducting material in the thin-film state. We performed [...] Read more.
Superconducting thin films are widely applied in various fields, including switching devices, because of their phase transition behaviors in relation to temperature changes. Therefore, it is important to quantitatively determine the optical constant of a superconducting material in the thin-film state. We performed a terahertz time-domain spectroscopy, based on a 10 femtoseconds pulse laser, to measure the optical constant of a superconducting GdBa2Cu3O7−x (GdBCO) thin film in the terahertz region. We then estimated the terahertz refractive indices of the 70 nm-thick GdBCO film using a numerical extraction process, even though the film thickness was approximately 1/10,000 times smaller than the terahertz wavelength range of 200 μm to 1 mm. The resulting refractive indices of the GdBCO thin film were consistent with the theoretical results using the two-fluid model. Our work will help to further understand the terahertz optical properties of superconducting thin films with thicknesses under 100 nm, as well as provide a standard platform for characterizing the optical properties of thin films without the need of Kramers–Kronig transformation at the terahertz frequencies. Full article
(This article belongs to the Special Issue Investgation of Molecular by Terahertz Spectroscopy)
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6 pages, 1386 KiB  
Article
Terahertz Emission and Ultrafast Carrier Dynamics of Ar-Ion Implanted Cu(In,Ga)Se2 Thin Films
by Chul Kang, Gyuseok Lee, Woo-Jung Lee, Dae-Hyung Cho, Inhee Maeng, Yong-Duck Chung and Chul-Sik Kee
Crystals 2021, 11(4), 411; https://doi.org/10.3390/cryst11040411 - 12 Apr 2021
Cited by 2 | Viewed by 2245
Abstract
We investigated THz emission from Ar-ion-implanted Cu(In,Ga)Se2 (CIGS) films. THz radiation from the CIGS films increases as the density of implanted Ar ions increases. This is because Ar ions contribute to an increase in the surface surge current density. The effect of [...] Read more.
We investigated THz emission from Ar-ion-implanted Cu(In,Ga)Se2 (CIGS) films. THz radiation from the CIGS films increases as the density of implanted Ar ions increases. This is because Ar ions contribute to an increase in the surface surge current density. The effect of Ar-ion implantation on the carrier dynamics of CIGS films was also investigated using optical pump THz probe spectroscopy. The fitted results imply that implanted Ar ions increase the charge transition of intra-and carrier–carrier scattering lifetimes and decrease the bandgap transition lifetime. Full article
(This article belongs to the Special Issue Investgation of Molecular by Terahertz Spectroscopy)
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