Special Issue "Photonic Crystals"

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

Deadline for manuscript submissions: 15 May 2020.

Special Issue Editors

Dr. Daniele Martella
E-Mail Website
Guest Editor
European Laboratory for Non-linear Spectroscopy (LENS), National Institute of Optics CNR-INO, Florence, Italy
Interests: liquid crystals; photonic materials; photopolymerizations; photonic crystals; microrobotics
Dr. Sara Nocentini
E-Mail Website
Guest Editor
European Laboratory for Non-linear Spectroscopy (LENS), National Institute of Optics CNR-INO, Florence, Italy
Interests: tunable photonics; liquid crystalline polymers; photonic crystals; photolitography

Special Issue Information

Dear Colleagues,

Photonic crystals (PCs), since they were proposed by John and Yablonovic in 1987, have been deeply studied and demonstrated for application in many fields, such as telecommunication, sensing, and lighting, to name a few. Within these devices, the periodic modulation of the dielectric permittivity determines a photonic band gap (PBG), i.e., the forbidden propagation of light in a selected frequency range. This peculiar feature creates a versatile platform to control and manipulate light in miniaturized high-performance devices by tailoring their cell unit and the material composition. PCs have been proposed in ordered 1D, 2D, or 3D designs as well as in an amorphous and disordered fashion to inspect light behavior in the presence of tailored degrees of disorder. The most common structures present a 2D geometry, enabling integration of other optical functions on chip while a 1D layer stack offers a simple design for reflection/transmission devices, whereas only 3D PCs allow a truly light manipulation in all dimensions.

Interestingly, PCs are not only passive devices, as properly integrating light-emitting sources enables controlling their spontaneous emission (due to the suppression of density of state in the PBG) or enhancing it by engineering PC’s defects as high-quality factor cavities. Another fascinating approach takes inspiration by nature: Structural colors that decorate some natural living systems revealed as mimicking nature always represent a valuable strategy that may reproduce the performances optimized by natural evolution.

At present, many relevant effects and applications have been brought to light, while the growing advances in lithographic techniques and material science continuously enlarge the field of PCs in order to introduce new functionalities. This Special Issue aims to collect original papers and short reviews that point out new approaches in the photonic crystals’ world. The introduction of novel functional materials for PCs and the exploitation of the PBG for appealing effects in active photonics, optical circuitry, sensing or anti-counterfeiting will enrich this Special Issue. Moreover, new fabrication approaches based on self-assembly or customized lithographic techniques will represent another important topic of the issue towards new opportunities of integration and tuning of the PC properties.

Dr. Daniele Martella
Dr. Sara Nocentini
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 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. 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 1400 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 crystals
  • Active photonics
  • Rewritable photonic crystals
  • Optical property modulation
  • Surface Bloch waves
  • Structural colors
  • Photonic band gap

Published Papers (1 paper)

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Research

Open AccessArticle
Magneto-Optical Isolator Based on Ultra-Wideband Photonic Crystals Waveguide for 5G Communication System
Crystals 2019, 9(11), 570; https://doi.org/10.3390/cryst9110570 - 30 Oct 2019
Abstract
This paper presents a novel magneto-optical isolator based on an ultra-wideband and high efficiency photonic crystals (PCs) waveguide and gyromagnetic ferrites. The three-dimensional numerical simulation finds that the photonic crystals waveguide’s (PCW) transmission efficiency rises with its height and width. The corresponding experiments [...] Read more.
This paper presents a novel magneto-optical isolator based on an ultra-wideband and high efficiency photonic crystals (PCs) waveguide and gyromagnetic ferrites. The three-dimensional numerical simulation finds that the photonic crystals waveguide’s (PCW) transmission efficiency rises with its height and width. The corresponding experiments are performed by using a triangular lattice Al2O3 dielectric posts array in 5G millimeter wave band. The measured transmission efficiency is up to 90.78% for the optimal PCs waveguide structure, which has ultra-wide operating bandwidth from 23.45 to 31.25 GHz. The magneto-optical isolator is designed by inserting two rectangular gyromagnetic ferrites into the PCs waveguide. Due to the contrast between the effective permeability of the left and right circular polarization waves passing through the magnetized ferrite sheets, the ferromagnetic resonance absorption of the forward and reverse waves is different. By using finite element method, the isolation is optimized to be 49.49 dB for the isolator and its relative bandwidth reaches 8.85%. The high isolation, broadband, and easy integration indicate that our designed magneto-optical isolator has significant advantage in 5G communication systems. Full article
(This article belongs to the Special Issue Photonic Crystals)
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