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Crystals
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Artificial Crystals
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Artificial Crystals

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (31 July 2022) | Viewed by 6189

Special Issue Editors

Prof. Dr. Jun Sun

E-Mail Website
Guest Editor
School of physics, Nankai University, Tianjin 300071, China
Interests: crystal growth; CZ method; EFG method; Bridgeman method; Kyropoulos method; heat exchanger method; electro-optic crystals; nonlinear optical crystals; pyroelectrics crystals; laser crystals
Prof. Dr. Zhitai Jia

E-Mail Website
Guest Editor
State Key Laboratory of Crystal Materials, Shandong University, No.27, Shanda Nanlu, Ji’nan 250100, China
Interests: design, preparation and characterization of functional crystal materials
Prof. Dr. Fangfang Zhang

E-Mail Website
Guest Editor
Xinjiang Technical Insitute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
Interests: nonlinear optical crystals; birefringent crystals; crystal growth; structure-properties relationships
Prof. Dr. Yuntao Wu

E-Mail Website
Guest Editor
Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai 201800, China
Interests: inorganic scintillators and their applications
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jinlong Liu

E-Mail Website
Guest Editor
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
Interests: wide bandgap semiconductor; diamond crystal and films; carbon materials

Special Issue Information

Dear Colleagues,

Crystals are some of the most important functional materials. Natural crystals are always subject to disadvantages such as small size, crystal defects, and poor performancep; therefore, high-quality natural crystals are extremely rare—meaning that they seldom meet the needs of practical applications. Currently, the main practical crystal materials are artificially synthesized crystals. The content of theoretical and technical research on artificial crystals is very rich and includes the design and preparation of new materials, raw material synthesis, crystal growth methods and processes, crystal quality control and detection, crystal property control, post-processing, applications, etc. Research on artificial crystals has a long history. A series of importantant crystals were explored from early synthetic crystals, such as rubies and diamonds, through current widely-used crystals such as Si, Ge, LiNbO3, LiTaO3, KTiPO4, β-BaB2O4, LiB3O5, Bi4Ge3O12, Y3Al5O12, and sapphire, to current research hotspots such as SiC, AlN, and sesquioxide single crystals. Based on these crystals, lots of new optoelectronic devices have been developed and are widely used in scientific research and industrial applications. Meanwhile, there are still many promising research fields that have yet to be further explored. For example, the basic principles of crystal materials are still unclear and higher quality, larger, and novel crystals are always in demand. This Special Issue aims to provide a timely collection that highlights the advances in the current research on artificial crystals, ranging from fundamental aspects to current applications—shedding light on further research in related fields.

Prof. Dr. Jun Sun
Prof. Dr. Zhitai Jia
Prof. Dr. Fangfang Zhang
Prof. Dr. Yuntao Wu
Prof. Dr. Jinlong Liu
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. 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 2600 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

  • Numerical simulation
  • Crystal design
  • Crystal preparation
  • Crystal defects
  • Crystal property
  • Crystal device
  • Crystal application

Published Papers (3 papers)

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Research

8 pages, 3564 KiB  
Article
A Simple Method to Build High Power PCSEL Array with Isolation Pattern Design
by Chia-Jui Chang, Lih-Ren Chen, Kuo-Bin Hong, Wei-Chih Weng, Bing-Hong Chuang, Hao-Chung Kuo and Tien-Chang Lu
Crystals 2022, 12(10), 1432; https://doi.org/10.3390/cryst12101432 - 10 Oct 2022
Cited by 1 | Viewed by 1988
Abstract
Photonic crystal surface-emitting lasers (PCSELs) hold promising properties of both edge emitting lasers (EELs) and vertical-cavity surface-emitting lasers (VCSELs). They possess high output power while radiating light vertically, being thought of as the next generation laser source. One of the main advantages of [...] Read more.
Photonic crystal surface-emitting lasers (PCSELs) hold promising properties of both edge emitting lasers (EELs) and vertical-cavity surface-emitting lasers (VCSELs). They possess high output power while radiating light vertically, being thought of as the next generation laser source. One of the main advantages of PCSELs is their scalability of size and power, which makes them applicable to high power applications or long-distance detection. However, due to problems such as current injection and mode competition, there are limits on their dimensions. To further increase the power, the capability of two-dimensional array integration paves the way. In this work, we demonstrate a new method to fabricate PCSEL arrays by defining an isolation pattern. We also investigate the influence of aperture size and array arrangement on lasing performance. Full article
(This article belongs to the Special Issue Artificial Crystals)
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11 pages, 3539 KiB  
Article
Influence of Temperature Field Distribution on the Growth of Aluminum Nitride Crystal by Simulation Technology
by Shengtao Zhang, Wenbo Yuan, Guofeng Fan, Tie Li and Lili Zhao
Crystals 2022, 12(9), 1320; https://doi.org/10.3390/cryst12091320 - 19 Sep 2022
Cited by 1 | Viewed by 1749
Abstract
During the crystal growth process, the temperature distribution in the reactor plays a decisive role in crystal growth and directly affects the crystal growth rate. In this study, a numerical simulation method was used to model and study the temperature distribution in the [...] Read more.
During the crystal growth process, the temperature distribution in the reactor plays a decisive role in crystal growth and directly affects the crystal growth rate. In this study, a numerical simulation method was used to model and study the temperature distribution in the PVT AlN crystal reactor. By adjusting the relative position of the heater and the crucible, different temperature field structures are obtained. The effect of different temperature gradients on the decisiveness of the crystal growth and the growth rate is explored and analyzed, and the best scheme is selected. With the help of simulation technology, a 52 mm diameter AlN crystal is successfully prepared with a certain thickness. The results prove the feasibility of the simulation scheme, which is supported by the existing experimental data. Full article
(This article belongs to the Special Issue Artificial Crystals)
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11 pages, 5581 KiB  
Article
In Situ Measurement Method Based on Edge Detection and Superpixel for Crystallization Imaging at High-Solid Concentrations
by Yan Huo, Diyuan Guan and Xin Li
Crystals 2022, 12(5), 730; https://doi.org/10.3390/cryst12050730 - 19 May 2022
Cited by 2 | Viewed by 1666
Abstract
To facilitate measuring crystal sizes during batch crystallization at high-solid concentrations by using an invasive imaging system, an in situ imaging measurement strategy based on edge detection and superpixel is proposed for the ambiguous boundary problem of large amounts of crystals. Firstly, an [...] Read more.
To facilitate measuring crystal sizes during batch crystallization at high-solid concentrations by using an invasive imaging system, an in situ imaging measurement strategy based on edge detection and superpixel is proposed for the ambiguous boundary problem of large amounts of crystals. Firstly, an image filtering is employed to cope with image degradation caused by noise disturbance and suspension turbulence in the crystallizer. Subsequently, an image segmentation method is developed by utilizing improved edge detection and superpixel, which can be easily performed for crystal extraction. Accordingly, crystal size measurement can be developed for evaluation of the crystal size distribution. The experiment results on α-form L-glutamic acid present the effectiveness of the proposed method. Full article
(This article belongs to the Special Issue Artificial Crystals)
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