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Photonics
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Topological Photonics
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Topological Photonics

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

Deadline for manuscript submissions: closed (15 September 2020) | Viewed by 8453

Special Issue Editor

Dr. Daniel Leykam

E-Mail Website
Guest Editor
Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34126, Korea
Interests: topological photonics; photonic lattices; flat bands

Special Issue Information

Dear Colleagues,

Topological phases in photonics have attracted significant interest since their first experimental demonstration in 2009, with observations in various platforms ranging from microwave metamaterials to nanoscale photonic crystals. Exciting developments in the past few years have included:

  • The emergence of 2D crystalline symmetry-protected topological phases as a platform for dielectric topological photonic crystals
  • Design of 3D topological photonic crystals and their realization at microwave frequencies
  • Generalizations of the topological band theory to non-Hermitian systems with gain and/or loss
  • Observations of lasing in topological photonic crystals and lattices

These developments highlight rapid progress towards harnessing topological concepts in future photonic devices such as optical isolators, lasers, and integrated waveguides. However, there are still a number of outstanding fundamental questions, such as:

  • Are current most popular methods used to implement photonic topological phases, largely based on isotropic dielectric media, optimal? Can topological photonics be extended to new classes of optical materials?
  • What are the ultimate limits to the size of topological photonic systems? Can 3D photonic topological insulators be scaled to visible wavelengths?
  • What role do topological phases play in nonlinear optical effects such as saturable gain or self-focusing? Can topological protection improve the performance of nonlinear devices such as lasers, switches, and isolators?

This Special Issue aims to highlight the most recent advances in the rapidly-evolving field, including theory, experiment, and potential applications. We welcome contributions studying not just topological photonics, but also closely related topics such as spin-orbit interactions of light, optical surface waves, and novel synergies between photonics and condensed matter physics.

Dr. Daniel Leykam
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. Photonics 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.

Published Papers (2 papers)

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Research

10 pages, 4017 KiB  
Article
Wave Front Tuning of Coupled Hyperbolic Surface Waves on Anisotropic Interfaces
by Taavi Repän, Osamu Takayama and Andrei V. Lavrinenko
Photonics 2020, 7(2), 34; https://doi.org/10.3390/photonics7020034 - 20 May 2020
Cited by 4 | Viewed by 3476
Abstract
A photonic surface wave, a propagating optical mode localized at the interface of two media, can play a significant role in controlling the flow of light at nanoscale. Among various types of such waves, surface waves with hyperbolic dispersion or simply hyperbolic surface [...] Read more.
A photonic surface wave, a propagating optical mode localized at the interface of two media, can play a significant role in controlling the flow of light at nanoscale. Among various types of such waves, surface waves with hyperbolic dispersion or simply hyperbolic surface waves supported on anisotropic metal interfaces can be exploited to effectively control the propagation of lightwaves. We used semi-analytical and numerical methods to study the nature of surface waves on several configurations of three-layers metal–dielectric–metal systems including isotropic and anisotropic cases where the metal cladding layers were assumed to have infinite thickness. We used semi-analytical and numerical approaches to study the phenomena. We showed that the propagation of surface wave can be tuned from diverging to converging in the plane of the interface by the combination of metals with different anisotropic properties. Full article
(This article belongs to the Special Issue Topological Photonics)
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11 pages, 8376 KiB  
Article
Topological Protection and Control of Quantum Markovianity
by Gian Luca Giorgi, Salvatore Lorenzo and Stefano Longhi
Photonics 2020, 7(1), 18; https://doi.org/10.3390/photonics7010018 - 08 Feb 2020
Cited by 9 | Viewed by 4014
Abstract
Under the Born–Markov approximation, a qubit system, such as a two-level atom, is known to undergo a memoryless decay of quantum coherence or excitation when weakly coupled to a featureless environment. Recently, it has been shown that unavoidable disorder in the environment is [...] Read more.
Under the Born–Markov approximation, a qubit system, such as a two-level atom, is known to undergo a memoryless decay of quantum coherence or excitation when weakly coupled to a featureless environment. Recently, it has been shown that unavoidable disorder in the environment is responsible for non-Markovian effects and information backflow from the environment into the system owing to Anderson localization. This turns disorder into a resource for enhancing non-Markovianity in the system–environment dynamics, which could be of relevance in cavity quantum electrodynamics. Here we consider the decoherence dynamics of a qubit weakly coupled to a two-dimensional bath with a nontrivial topological phase, such as a two-level atom embedded in a two-dimensional coupled-cavity array with a synthetic gauge field realizing a quantum-Hall bath, and show that Markovianity is protected against moderate disorder owing to the robustness of chiral edge modes in the quantum-Hall bath. Interestingly, switching off the gauge field, i.e., flipping the bath into a topological trivial phase, allows one to re-introduce non-Markovian effects. Such a result indicates that changing the topological phase of a bath by a tunable synthetic gauge field can be harnessed to control non-Markovian effects and quantum information backflow in a qubit-environment system. Full article
(This article belongs to the Special Issue Topological Photonics)
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