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Symmetry
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Advances in Photonics
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Advances in Photonics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 3425

Special Issue Editor

Prof. Dr. Kensuke Ogawa

E-Mail Website
Guest Editor
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, Chome-12-1 Ookayama, Meguro City, Tokyo
Interests: photonic integrated circuits; photonic integration platforms; electro–optic materials; magneto–optic materials; topological photonics; photonic crystals; metamaterials; plasmons
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Symmetry-related properties in condensed matter systems provide the foundation of photonics for controlling lightwaves in optical communications and signal processing. Electro-optic effect of ionic atoms in non-centrosymmetric dielectric crystal and electro-refraction effect in centrosymmetric crystalline silicon, for instance, have been key items for optical signal generation in high-speed optical communications. The nonreciprocal magneto-optic effect plays essential roles in the magneto-optical memory in storage and computing and the optical isolator in laser application. Photonic integration platforms on silicon and III-V semiconductors enable versatile optoelectronic circuits in ultrasmall footprints. Further, the photonic integration platforms allow photonic devices consisting of artificial structures such as photonic crystals, metamaterials and plasmons which reveal topological effects in the propagation of lightwaves, which will open up a new arena in photonics.

Prof. Kensuke Ogawa
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. Symmetry 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 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 integrated circuits
  • photonic integration platforms
  • electro–optic materials
  • magneto–optic materials
  • topological photonics
  • photonic crystals
  • metamaterials
  • plasmons

Published Papers (2 papers)

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Research

30 pages, 1466 KiB  
Article
Exact Solutions for Vector Phase-Matching Conditions in Nonlinear Uniaxial Crystals
by Juan López-Durán and Oscar Rosas-Ortiz
Symmetry 2022, 14(11), 2272; https://doi.org/10.3390/sym14112272 - 29 Oct 2022
Cited by 1 | Viewed by 2004
Abstract
The transcendental equations of vector phase matching are transformed into a fourth-order polynomial equation that admits an analytical solution. The real roots of this equation provide the optical axis orientations that are useful for efficient down-conversion in nonlinear uniaxial crystals. The production of [...] Read more.
The transcendental equations of vector phase matching are transformed into a fourth-order polynomial equation that admits an analytical solution. The real roots of this equation provide the optical axis orientations that are useful for efficient down-conversion in nonlinear uniaxial crystals. The production of entangled photon pairs is discussed in both collinear and non-collinear configurations of the spontaneous parametric down-conversion (SPDC) process. Degenerate and non-degenerate cases are also distinguished. As a practical example, SPDC processes of type-I and type-II are studied for beta-barium borate (BBO) crystals. The predictions are in very good agreement with experimental measurements already reported in the literature and include theoretical results of other authors as particular cases. Some properties that seem to be exclusive to BBO crystals are reported; the experimental verification of the latter would allow a better characterization of these crystals. Full article
(This article belongs to the Special Issue Advances in Photonics)
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13 pages, 2328 KiB  
Article
Design of Broadband and Wide-Angle Hexagonal Metamaterial Absorber Based on Optimal Tiling of Rhombus Carbon Pixels and Implantation of Copper Cylinders
by Yongjune Kim and Jeong-Hae Lee
Symmetry 2021, 13(11), 2045; https://doi.org/10.3390/sym13112045 - 30 Oct 2021
Cited by 9 | Viewed by 1677
Abstract
A design method for a broadband and wide-angle metamaterial absorber is proposed based on optimal tiling of rhombus carbon pixels on and implantation of metal cylinders inside an acrylic substrate for which the backside is blocked by the perfect conductor. First, an intermediate [...] Read more.
A design method for a broadband and wide-angle metamaterial absorber is proposed based on optimal tiling of rhombus carbon pixels on and implantation of metal cylinders inside an acrylic substrate for which the backside is blocked by the perfect conductor. First, an intermediate carbon metapattern is achieved via optimal tiling of rhombus carbon pixels based on the genetic algorithm (GA), which can minimize the reflectances of both of the transverse electric (TE) and transverse magnetic (TM) polarized electromagnetic (EM) waves for the incident angles 0∘ and 60∘ simultaneously. Then, copper cylinders are implanted inside the substrate to boost the absorptions of both of the TE and TM polarizations for the 60∘ oblique incidences. To extend the absorption bandwidth, the design is finalized by evolving the intermediate metapattern using the GA. Based on the finalized carbon metapattern, the 90% absorption bandwidth is confirmed in the frequency range 8.8 to 11.6 GHz, for which the fractional bandwidth is 27.5% for both of the two polarizations with the incident angles from 0∘ to 60∘. The proposed method could open a way to design a broadband and wide-angle EM metamaterial absorber that can be applied to the edges of three-dimensional structures such as a regular tetrahedron or square pyramid that have interior angles of 60∘ that cannot be covered by conventional square or rectangular metamaterial absorbers. Full article
(This article belongs to the Special Issue Advances in Photonics)
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