Special Issue "Selected papers from “International Quantum Cascade Laser School and Workshop 2018”"

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

Deadline for manuscript submissions: 31 October 2019.

Special Issue Editors

Guest Editor
Prof. Sukhdeep Dhillon Website E-Mail
Laboratoire Pierre Aigrain, Département de physique de l’ENS, École normale supérieure, PSL Research University, Université Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, UPMC Université Paris 06, CNRS, Paris, France
Interests: optoelectronics; photonics; terahertz; mid-infrared; ultrafast spectroscopy; nonlinear optics
Guest Editor
Dr. Sushil Kumar Website E-Mail
Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, PA, 18015, USA
Guest Editor
Prof. Angela Vasanelli Website E-Mail
Université Paris Diderot-Paris7, Laboratoire Matériaux et Phénomènes Quantiques, Bâtiment Condorcet, Case courrier 7021, F-75205 PARIS CEDEX 13 France

Special Issue Information

Dear Colleagues,

IQCLSW 2018 will be the 8th conference in a series of international meetings on quantum cascade lasers (QCLs), and will be held in Cassis (France), 2–7 September, 2018. QCLs are unipolar optoelectronic devices that exploit optical transitions between engineered electronic subbands in semiconductor quantum wells. This concept has provided outstanding laser performance across the mid-infrared and terahertz (THz) spectral ranges, where there is a lack of practical photonic sources. IQCLSW is the main biennial event for the QCL community, divided into a school and workshop environment. The school provides an overview of the main developments and concepts in the field through courses from world leading researchers in the domain. The second workshop part presents the latest developments in the community, from fundamental physics to the exploitation and applications of this technology.

We are very glad to serve as Guest Editors of this Special Issue to be published in Photonics that will contain a selection of papers submitted and accepted at IQCLSW 2018. Its main scope is to provide a timely and broad collection of the most innovative topics discussed at the latest edition of the school and workshop related to mid-infrared and THz photonics and optoelectronics. We warmly invite researchers to submit their contributions to this Special Issue. Potential topics include, but are not limited to:

  • Theory and design of quantum cascade lasers
  • New breakthroughs in quantum cascade laser performance
  • Novel and new material systems
  • Nonlinear effects in quantum cascade lasers
  • Broadband gain media design and growth
  • Quantum cascade laser photonic integrated circuits
  • Novel waveguides for functionalised emission
  • Strong light-matter interactions
  • New detection schemes and methods (coherent detection, near-field etc.)
  • Chemical/biomedical applications for cascade lasers
  • Communication applications for cascade lasers
  • Active imaging applications for cascade lasers
  • Defense/homeland security applications for cascade lasers

Please note that for this Special Issue on the IQCLSW, MDPI will waive the Article Processing Charges (APC) for submissions from this conference.

Prof. Sukhdeep Dhillon
Dr. Sushil Kumar
Prof. Angela Vasanelli
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. Photonics is an international peer-reviewed open access quarterly 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 1000 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

  • Quantum Cascade Lasers
  • Mid-infrared and Terahertz Photonics
  • Novel optical effects
  • Quantum and Waveguide Engineering
  • Light-matter interactions
  • New material systems
  • Quantum Electronics
  • Semiconductor Lasers

Published Papers (2 papers)

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Research

Open AccessArticle
Evidence of Intersubband Linewidth Narrowing Using Growth Interruption Technique
Photonics 2019, 6(2), 38; https://doi.org/10.3390/photonics6020038 - 01 Apr 2019
Abstract
We report on the systematic study of two main scattering mechanisms on intersubband transitions, namely ionized impurity scattering and interface roughness scattering. The former mechanism has been investigated as a function of the dopants position within a multiple GaAs/AlGaAs quantum well structure and [...] Read more.
We report on the systematic study of two main scattering mechanisms on intersubband transitions, namely ionized impurity scattering and interface roughness scattering. The former mechanism has been investigated as a function of the dopants position within a multiple GaAs/AlGaAs quantum well structure and compared to the transition of an undoped sample. The study on the latter scattering mechanism has been conducted using the growth interruption technique. We report an improvement of the intersubband (ISB) transition linewidth up to 11% by interrupting growth at GaAs-on-AlGaAs interfaces. As a result, the lifetime of intersubband polaritons could be improved up to 9%. This leads to a reduction of 17% of the theoretical threshold intensity for polaritonic coherent emission. This work brings a useful contribution towards the realization of polariton-based devices. Full article
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Open AccessArticle
Long Wavelength (λ > 17 µm) Distributed Feedback Quantum Cascade Lasers Operating in a Continuous Wave at Room Temperature
Photonics 2019, 6(1), 31; https://doi.org/10.3390/photonics6010031 - 21 Mar 2019
Abstract
The extension of the available spectral range covered by quantum cascade lasers (QCL) would allow one to address new molecular spectroscopy applications, in particular in the long wavelength domain of the mid-infrared. We report in this paper the realization of distributed feedback (DFB) [...] Read more.
The extension of the available spectral range covered by quantum cascade lasers (QCL) would allow one to address new molecular spectroscopy applications, in particular in the long wavelength domain of the mid-infrared. We report in this paper the realization of distributed feedback (DFB) QCLs, made of InAs and AlSb, that demonstrated a continuous wave (CW) and a single mode emission at a wavelength of 17.7 µm, with output powers in the mW range. This is the longest wavelength for DFB QCLs, and for any QCLs or semiconductor lasers in general, operating in a CW at room temperature. Full article
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