Special Issue "Frontiers in Terahertz Science and Technology"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (31 October 2015)

Special Issue Editor

Guest Editor
Prof. Dr. Christoph Peter Hauri

Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
Website | E-Mail
Interests: high-harmonic generation; Terahertz spectroscopy; ultrafast magnetization dynamics; electron photoemission; electron fieldemission; ultrafast and nonlinear optics

Special Issue Information

Dear Colleagues,

The recent advance in Terahertz generation, pulse shaping, and imaging technology has opened up new opportunities in basic and applied science. Terahertz sources with advanced capabilities are of growing interest for time-resolved investigations of ultrafast phenomena, including carrier, lattice, and spin dynamics, as well as for linear and nonlinear spectroscopy.

In this Special Issue we want to address recent advances and trends on the following topics:

-linear and nonlinear THz spectroscopy in condensed matter and molecules
-multi-dimensional spectroscopy
-strong-field phenomena in solids and at interfaces
-near field and far field spectroscopy
-charged particle manipulation and acceleration
-THz pulse shaping technology
-intense and tunable narrowband/broadband THz sources

Submissions are invited for original research articles. Review articles are also welcome on a sub-topic of the Special Issue and should give a well-balanced overview on the area and include main results from other groups.

Prof. Dr. Christoph Peter Hauri
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 papers will be 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. Applied Sciences is an international peer-reviewed open access semimonthly 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 1500 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

  • Nano spectroscopy
  • multi-dimensional spectroscopy
  • ultrafast magnetism
  • semiconductor
  • graphene
  • superconductors
  • complex materials
  • carrier dynamics
  • strong-field physics
  • field emission
  • metamaterials
  • particle acceleration
  • pulse shaping
  • source developments

Published Papers (5 papers)

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Research

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Open AccessArticle Monitoring Theophylline Concentrations in Saline Using Terahertz ATR Spectroscopy
Appl. Sci. 2016, 6(3), 72; https://doi.org/10.3390/app6030072
Received: 21 November 2015 / Revised: 3 February 2016 / Accepted: 24 February 2016 / Published: 3 March 2016
Cited by 1 | PDF Full-text (1182 KB) | HTML Full-text | XML Full-text
Abstract
To assess the possibility of terahertz technology for the determination of drug concentration in blood, we endeavored to apply a terahertz (THz) attenuated total reflection (ATR) method to measure the levels of theophylline in saline. A change in reflected THz wave amplitude was [...] Read more.
To assess the possibility of terahertz technology for the determination of drug concentration in blood, we endeavored to apply a terahertz (THz) attenuated total reflection (ATR) method to measure the levels of theophylline in saline. A change in reflected THz wave amplitude was observed in a theophylline concentration-dependent manner. This result was obtained with simple measurements of comparisons of the amplitude of the reflected wave, and suggests that it is possible to monitor concentration changes of drugs in liquid material using THz ATR measurements. Full article
(This article belongs to the Special Issue Frontiers in Terahertz Science and Technology)
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Open AccessArticle Tailoring of Highly Intense THz Radiation Through High Brightness Electron Beams Longitudinal Manipulation
Appl. Sci. 2016, 6(2), 56; https://doi.org/10.3390/app6020056
Received: 4 November 2015 / Revised: 11 January 2016 / Accepted: 3 February 2016 / Published: 18 February 2016
Cited by 10 | PDF Full-text (2510 KB) | HTML Full-text | XML Full-text
Abstract
The ultra-short electron beams, produced through the velocity bunching compression technique at the SPARC_LAB test Facility (Frascati, Italy), are used to produce Coherent Transition Radiation in the terahertz (THz) range. This paper reports on the main features of this THz source, which have [...] Read more.
The ultra-short electron beams, produced through the velocity bunching compression technique at the SPARC_LAB test Facility (Frascati, Italy), are used to produce Coherent Transition Radiation in the terahertz (THz) range. This paper reports on the main features of this THz source, which have a spectral coverage up to 5 THz, a pulse duration down to 100 fs, and an energy per pulse on the order of tens of μJ. These figures of merits open the possibility to apply this source for nonlinear and THz pump-probe experiments in Solid-State Physics and material science. Full article
(This article belongs to the Special Issue Frontiers in Terahertz Science and Technology)
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Open AccessArticle Enhancement Effects of the Terahertz Near-Field Microscopy
Appl. Sci. 2015, 5(4), 1745-1755; https://doi.org/10.3390/app5041745
Received: 12 October 2015 / Revised: 3 December 2015 / Accepted: 8 December 2015 / Published: 11 December 2015
Cited by 3 | PDF Full-text (1490 KB) | HTML Full-text | XML Full-text
Abstract
Terahertz near-field detection based and imaging on a nanotip has drawn wide attention following extensive applications of terahertz imaging technologies. Through the local enhanced electric field created by a terahertz nanotip in the near field, it is very likely to attain superior detection [...] Read more.
Terahertz near-field detection based and imaging on a nanotip has drawn wide attention following extensive applications of terahertz imaging technologies. Through the local enhanced electric field created by a terahertz nanotip in the near field, it is very likely to attain superior detection sensitivity and higher spatial resolution. This paper simulates the local enhancement effects of the terahertz near-field microscopy using a two-dimension finite difference time domain (2D-FDTD) method. Factors that influence the enhancement effects are investigated and analyzed in detail. Simulation results show that the size of the nanotip apex, the apex-substrate distance, dielectric properties of the substrate and the detected sample, etc., have significant impacts on the electric field enhancement and spatial resolution of the terahertz near-field nanotip, which can be explained from the effective polarizability of the nanotip-sample/substrate system. Full article
(This article belongs to the Special Issue Frontiers in Terahertz Science and Technology)
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Review

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Open AccessReview The Spectrum of Density Fluctuations of Noble Gases Probed by THz Neutron and X-ray Spectroscopy
Appl. Sci. 2016, 6(3), 64; https://doi.org/10.3390/app6030064
Received: 24 November 2015 / Revised: 21 January 2016 / Accepted: 25 January 2016 / Published: 26 February 2016
Cited by 2 | PDF Full-text (3432 KB) | HTML Full-text | XML Full-text
Abstract
Approximately 50 years of inelastic scattering studies of noble gases are reviewed to illustrate the main advances achieved in the understanding of the THz dynamics of simple systems. The gradual departure of the spectral shape from the hydrodynamic regime is discussed with an [...] Read more.
Approximately 50 years of inelastic scattering studies of noble gases are reviewed to illustrate the main advances achieved in the understanding of the THz dynamics of simple systems. The gradual departure of the spectral shape from the hydrodynamic regime is discussed with an emphasis on the phenomenology of fast (sub-ps) relaxation processes. This review shows that relaxation phenomena in noble gases have an essentially collisional origin, which is also revealed by the parallelism between their characteristic timescale and the interatomic collision time. Additionally, recent THz spectroscopy results on noble gases at extreme thermodynamic conditions are discussed to illustrate the need for a revision of our current understanding of the supercritical phase. Full article
(This article belongs to the Special Issue Frontiers in Terahertz Science and Technology)
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Open AccessReview Dynamics of Carrier Transport in Nanoscale Materials: Origin of Non-Drude Behavior in the Terahertz Frequency Range
Appl. Sci. 2016, 6(2), 50; https://doi.org/10.3390/app6020050
Received: 18 November 2015 / Accepted: 27 January 2016 / Published: 14 February 2016
Cited by 2 | PDF Full-text (1820 KB) | HTML Full-text | XML Full-text
Abstract
It is known that deviation from the Drude law for free carriers is dramatic in most electronically conductive nanomaterials. We review recent studies of the conductivity of nanoscale materials at terahertz (THz) frequencies. We suggest that among a variety of theoretical formalisms, a [...] Read more.
It is known that deviation from the Drude law for free carriers is dramatic in most electronically conductive nanomaterials. We review recent studies of the conductivity of nanoscale materials at terahertz (THz) frequencies. We suggest that among a variety of theoretical formalisms, a model of series sequence of transport involving grains and grain boundaries provides a reasonable explanation of Lorentz-type resonance (non-Drude behavior) in nanomaterials. Of particular interest is why do free carriers exhibit a Lorentz-type resonance. Full article
(This article belongs to the Special Issue Frontiers in Terahertz Science and Technology)
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