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Photonics
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Advances of Laser Diode and LED
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Advances of Laser Diode and LED

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

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 11784

Special Issue Editor

Dr. Chee-Keong Tan

E-Mail Website
Guest Editor
Advanced Materials Thrust, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou, China
Interests: III-nitride; gallium nitride; light emitting diode; gallium oxide; power electronics; photodetectors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Semiconductor lasers and light emitting diodes (LEDs) have been rapidly developed for the past decades attributed to the dedication and passion of scientists and engineers, as well as the strong need of achieving high efficiency in the advanced technologies. Today various kinds of lasers and LEDs have been successfully created and these devices have gained wide applications in the fields of telecommunications, data system, display, industrial processing and more.  With these advances, many related research fields have gained significant progress and created branches of new research subfields that play key roles in shaping up our future technology.

Therefore, this Special Issue on “Advances in Laser Diodes and LEDs” is intended to open discussions on the frontier of research in the exciting light emitters. This issue is collecting the latest original research articles, in-depth and forward-looking review articles in the fields of semiconductor lasers, inorganic LEDs, organic LEDs as well as many other light emitting devices. Novel materials, device architectures, quantum and nanostructures, fabrication techniques, applications of the lasers, LEDs and OLEDs for wide spectral range including ultraviolet, visible, infrared and white are topics of interests for this Special Issue. Articles, comments, perspectives, reviews are all welcome and invited to convey the current state-of-the-art technical aspects for laser diodes and LEDs.

Dr. Chee-Keong Tan
Guest Editor

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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.

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Published Papers (3 papers)

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Research

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10 pages, 5057 KiB  
Communication
Enhancement in Structural and Electroluminescence Properties of Green Light Emission for Semipolar (11–22) InGaN/GaN Based Grown on m-Plane Sapphire via Low Temperature Ammonia Treatment (LTAT)
by Gary Tan, Ahmad Shuhaimi, Rizuan Norhaniza, Norhilmi Zahir, Yan Jie Low, Yew Hoong Wong and Wan Haliza Abd Majid
Photonics 2022, 9(9), 646; https://doi.org/10.3390/photonics9090646 - 8 Sep 2022
Cited by 1 | Viewed by 1755
Abstract
Research on enhancement green light emitter is important to obtain a perfect red-green-blue (RGB) induced white light source. Unfortunately the present of mixed phase in deposition of InGaN/GaN limited the potential LED efficiency. Therefore, we introduce a new method called as Low Temperature [...] Read more.
Research on enhancement green light emitter is important to obtain a perfect red-green-blue (RGB) induced white light source. Unfortunately the present of mixed phase in deposition of InGaN/GaN limited the potential LED efficiency. Therefore, we introduce a new method called as Low Temperature Ammonia Treatment (LTAT) to eliminate the mixed phase and to enhance the structure properties of InGaN/GaN. Two samples have been prepared, with LTAT (LED A) and without LTAT (LED B). Both samples have been characterized using optical microscope (OM), Atomic Force Microscope (AFM), X-ray rocking curve (XRC) and Electroluminescence (EL). On the structural characterization, the OM results show the present 3D island on LED B sample while sample LED A only shows 2D surface. The RMS surface roughness from AFM are 10.3 ± 0.4 nm and 13.5 ± 10.7 nm for LED A and LED B respectively. XRC analysis proved the LED A with LTAT has a homogenous XRD curve while LED B without LTAT has a mixed phase. The BSFs streak length measured as 1.42 nm−1 and 1.61 nm−1 for LED A and LED B respectively shows low crystallographic defect in LED A compared to LED B. For the EL characteristic, LED A shows a single sharp peak near 538.2 nm wavelength, while LED B shows a broad multi-peak profile at 435.7 nm, 480.6 nm and 520.5 nm. The single sharp peak shows enhancement in green light emission when LTAT is applied during deposition. Successful enhancement is structural and electroluminescence properties shows the effectiveness of LTAT proposed in this work for perfect RGB. Full article
(This article belongs to the Special Issue Advances of Laser Diode and LED)
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Review

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15 pages, 3571 KiB  
Review
Sensing by Dynamics of Lasers with External Optical Feedback: A Review
by Bin Liu, Yangfan Jiang and Haining Ji
Photonics 2022, 9(7), 450; https://doi.org/10.3390/photonics9070450 - 27 Jun 2022
Cited by 14 | Viewed by 3032
Abstract
External optical feedback (EOF) has great impacts on the properties of lasers. It influences the stable operation of lasers. However, various applications based on lasers with EOF have been developed. One typical example is self-mixing interferometry technology, where modulated steady-state laser intensity is [...] Read more.
External optical feedback (EOF) has great impacts on the properties of lasers. It influences the stable operation of lasers. However, various applications based on lasers with EOF have been developed. One typical example is self-mixing interferometry technology, where modulated steady-state laser intensity is utilized for sensing and measurement. Other works show that laser dynamics can also be used for sensing, and the laser in this case is more sensitive to EOF. This paper reviews the sensing technology that uses the dynamics of lasers with EOF. We firstly introduce the basic operating principles of a laser with EOF and discuss the noise properties of and intensity modification in lasers induced by EOF. Then, sensing applications using laser dynamics are categorized and presented, including sensing by frequency-shifted optical feedback, relaxation oscillation frequency, and dynamics with self-mixing interferometry signals and laser optical chaos. Lastly, we present an analysis of the transient response waveform and spectrum of a laser with EOF, showing its potential for sensing. Full article
(This article belongs to the Special Issue Advances of Laser Diode and LED)
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11 pages, 2162 KiB  
Review
A Scoping Review of the Efficacy of Diode Lasers Used for Minimally Invasive Exposure of Impacted Teeth or Teeth with Delayed Eruption
by Ali Borzabadi-Farahani
Photonics 2022, 9(4), 265; https://doi.org/10.3390/photonics9040265 - 17 Apr 2022
Cited by 6 | Viewed by 6009
Abstract
Background: The use of diode lasers for oral surgery soft tissue procedures is associated with less pain and bleeding, quick recovery, and better surgical site visibility. Objectives: This scoping review identifies and analyses the evidence evaluating the efficacy of the diode laser surgical [...] Read more.
Background: The use of diode lasers for oral surgery soft tissue procedures is associated with less pain and bleeding, quick recovery, and better surgical site visibility. Objectives: This scoping review identifies and analyses the evidence evaluating the efficacy of the diode laser surgical exposure of impacted teeth or teeth with delayed eruption (both with no overlaying bone) vs. conventional scalpel surgical exposure. Materials and Methods: The PubMed/Medline, SCOPUS, and Google Scholar databases were searched up to January 2022 for randomized clinical trials and case-control studies comparing diode laser impacted-tooth surgical exposure vs. conventional surgical methods. Furthermore, the surgical exposure of an impacted mandibular canine or premolars with a 940 nm (InGaAsP) diode laser was presented. Results: The literature search revealed no high-quality evidence. However, four prospective studies were identified. Diode laser application was associated with less pain or analgesic need, minimal/no bleeding, and no need for suturing after surgery. The laser wavelengths used were 808, 810, 935, and 980 nm. A comparison of the study outcomes was not possible; all the studies had methodological issues and their funding sources were not mentioned. Conclusions: Adequately powered clinical trials are needed for comparing outcomes from diode laser surgical exposure vs. conventional methods, identifying the ideal laser characteristics, and assessing the long-term periodontal health of laser-exposed teeth and any potential risks. Full article
(This article belongs to the Special Issue Advances of Laser Diode and LED)
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