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Applied Sciences
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Photonic Crystals for Electromagnetic Applications
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Photonic Crystals for Electromagnetic Applications

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

Deadline for manuscript submissions: closed (31 July 2019) | Viewed by 6248

Special Issue Editor

Prof. Dr. Soshu Kirihara

E-Mail Website
Guest Editor
Joining and Welding Research Institute, Osaka University, 11–1 Mihogaoka, Ibaraki City, Osaka 567-0047, Japan
Interests: additive manufacturing; laser lithography; electromagnetic devices, bioceramic implant; energy harvesting
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The photonic crystals that are the main theme of the upcoming Special Issue have been designed, fabricated, and evaluated to realize the effective modulation of electromagnetic waves.

Artificial crystals with periodic patterns, fabricated from polymer, glass, ceramic, or metal, can exhibit forbidden bands in their electromagnetic transmission spectra. The frequency ranges of the band gaps are defined by diffraction wavelengths that are comparable with lattice constants. Structural defects with point, line, and plane shapes have been introduced to attain electromagnetic resonance and localization and thus create permission and transmission modes. The peak frequencies can be shifted according to the defect sizes and cavity volumes.

Crystal lattices of nano-, micro-, or millimeter sizes have been fabricated using advanced semiconductor processes or novel additive manufacturing. The electromagnetic properties of visible light or microwaves have been simulated and evaluated for future application to resonators, filters, waveguides, amplifiers, and oscillators.

As a Guest Editor, it gives me immense pleasure to invite you to submit your manuscripts for this Special Issue entitled “Photonic Crystals for Electromagnetic Applications.”

Prof. Soshu Kirihara
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. 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 2400 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

  • photonic crystal
  • theoretical simulation
  • fabrication process
  • electromagnetic wave modulation

Published Papers (3 papers)

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Research

8 pages, 2322 KiB  
Article
Enhanced FANO Structure Based on Tip-Field-Enhancement Theory
by Tianchi Zhou, Bo Zhang, Yaxin Zhang, Chao Shu, Shixiong Liang, Lan Wang and Kaijun Song
Appl. Sci. 2019, 9(23), 5009; https://doi.org/10.3390/app9235009 - 21 Nov 2019
Viewed by 1768
Abstract
High-Q metasurfaces have attracted much interest owing to their potential application in biological sensors. FANO is a type of high-Q factor metasurface. However, it is difficult to achieve large resonant intensity and a high-Q factor at the same time. In this paper, by [...] Read more.
High-Q metasurfaces have attracted much interest owing to their potential application in biological sensors. FANO is a type of high-Q factor metasurface. However, it is difficult to achieve large resonant intensity and a high-Q factor at the same time. In this paper, by sharpening the tips of the asymmetrical split-ring FANO structure and letting more charges stack at the tips to enhance tip coupling, the Q factor was significantly improved without sacrificing too much resonant intensity. Simulation results showed that the Q factor increased up to 2.4 times, while the resonant intensity stayed higher than 20 dB, and the experiment results agreed with the simulations. This indicated that the tip-field-enhancement theory can be applied in time-harmonic electromagnetic-fields, and the method proposed here can be used to increase the sensitivity and accuracy of microfluidic sensors. Additionally, other types of research, such as on antenna design, could benefit from this theory. Full article
(This article belongs to the Special Issue Photonic Crystals for Electromagnetic Applications)
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9 pages, 2819 KiB  
Article
Single-Pass Laser Frequency Conversion to 780.2 nm and 852.3 nm Based on PPMgO:LN Bulk Crystals and Diode-Laser-Seeded Fiber Amplifiers
by Kong Zhang, Jun He and Junmin Wang
Appl. Sci. 2019, 9(22), 4942; https://doi.org/10.3390/app9224942 - 17 Nov 2019
Viewed by 2355
Abstract
We report the preparation of a 780.2 nm and 852.3 nm laser device based on single-pass periodically poled magnesium-oxide-doped lithium niobate (PPMgO:LN) bulk crystals and diode-laser-seeded fiber amplifiers. First, a single-frequency continuously tunable 780.2 nm laser of more than 600 mW from second-harmonic [...] Read more.
We report the preparation of a 780.2 nm and 852.3 nm laser device based on single-pass periodically poled magnesium-oxide-doped lithium niobate (PPMgO:LN) bulk crystals and diode-laser-seeded fiber amplifiers. First, a single-frequency continuously tunable 780.2 nm laser of more than 600 mW from second-harmonic generation (SHG) by a 1560.5 nm laser can be achieved. Then, a 250 mW light at 852.3 nm is generated and achieves an overall conversion efficiency of 4.1% from sum-frequency generation (SFG) by mixing the 1560.5 nm and 1878.0 nm lasers. The continuously tunable range of 780.2 nm and 852.3 nm are at least 6.8 GHz and 9.2 GHz. By employing this laser system, we can conveniently perform laser cooling, trapping and manipulating both rubidium (Rb) and cesium (Cs) atoms simultaneously. This system has promising applications in a cold atoms Rb-Cs two-component interferemeter and in the formation of the RbCs dimer by the photoassociation of cold Rb and Cs atoms confined in a magneto-optical trap. Full article
(This article belongs to the Special Issue Photonic Crystals for Electromagnetic Applications)
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8 pages, 1573 KiB  
Article
Digitally Chirped Multilayer Quantum Dot Lasers with Dual-Wavelength Lasing Emissions
by Yi-Jan Leo Sun, Pin-Hsien Hsieh and Gray Lin
Appl. Sci. 2019, 9(11), 2246; https://doi.org/10.3390/app9112246 - 31 May 2019
Viewed by 1735
Abstract
The dual-wavelength lasing emissions of digitally chirped multilayer quantum dot (QD) lasers are investigated both experimentally and theoretically. The two lasing wavelengths are both identified as ground-state (GS) emissions but originated from different stacks of QD multilayers. The lasing spectra exhibited broadening and [...] Read more.
The dual-wavelength lasing emissions of digitally chirped multilayer quantum dot (QD) lasers are investigated both experimentally and theoretically. The two lasing wavelengths are both identified as ground-state (GS) emissions but originated from different stacks of QD multilayers. The lasing spectra exhibited broadening and splitting properties by injecting more current. Moreover, the wavelength-resolved light-current characteristics reveal that first GS lasing intensity upon the threshold of second GS transitions neither saturates nor droops with increasing injection current, but increases with slightly reduced slope efficiency. A theoretical model is developed for digitally chirped multilayer QD lasers. The simulation results qualitatively reproduce the experimental observations. Full article
(This article belongs to the Special Issue Photonic Crystals for Electromagnetic Applications)
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