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Applied Sciences
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Recent Advances in Nonlinear Optics at the Nanoscale
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Recent Advances in Nonlinear Optics at the Nanoscale

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

Deadline for manuscript submissions: closed (30 September 2019) | Viewed by 8698

Special Issue Editors

Prof. Dr. Concita Sibilia

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Guest Editor
Department of Basic and Applied Science—SBAI, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Roma RM, Italy
Interests: optics; nonlinear optics; materials; metamaterials; photonic crystals
Prof. Dr. Mario Bertolotti

E-Mail Website
Guest Editor
Department of Basic and Applied Sciences for Engineering, Sapienza University of Rome, 00185 Roma, Italy
Interests: photonics; nonlinear optics; semiconductor; optics and photonics; optoelectronics; nanophotonics; optics and lasers; optics; optical physics; experimental physics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Marco Centini

E-Mail Website
Guest Editor
Department of Basic and Applied Science- SBAI , Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Roma RM, Italy
Interests: optics; nonlinear optics; materials; photonic crystals

Special Issue Information

Dear Colleagues,

This Special Issue aims to survey the state-of-the-art in different aspects of nonlinear optics, including quantum effects, in many different nanophotonic systems. It is open to original research and review papers in a range of areas, such as nanophotonics and photonic nanostructures, metamaterials, metasurfaces, plasmonic, and advances in the nanoscale control of optical fields, to strongly enhance the interaction of photons with quantum emitters. It is also open to novel materials and novel effects, including nonlinear optics at low intensity. In addition, this Special Issue welcomes manuscripts on the applications of nonlinear phenomena, nonlinear imaging and manipulation, devices and systems, the fundamental aspects of nonlinear dynamics in single or coupled photonic devices, polariton condensates, and optomechanical systems.

Prof. Dr. Concita Sibilia
Prof. Dr. Mario Bertolotti
Prof. Dr. Marco Centini
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. 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

  • Nanophotonics
  • Plasmonics
  • Quantum plasmonics
  • Quantum photonics
  • Metamaterials
  • 2D materials
  • Low dimensional materials
  • Nonlinear imaging
  • Nanoantennas
  • Low permittivity (ENZ) media
  • Nonlocal effects
  • Frequency conversion
  • Ultrafast switching

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Published Papers (3 papers)

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Research

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11 pages, 2559 KiB  
Article
Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene
by Dong Zhao, Bin Xu, Huang Guo, Wuxiong Xu, Dong Zhong and Shaolin Ke
Appl. Sci. 2019, 9(23), 5125; https://doi.org/10.3390/app9235125 - 26 Nov 2019
Cited by 10 | Viewed by 2600
Abstract
We explore the optical bistability in aperiodic parity–time-symmetric (PT-symmetric) photonic lattices that are composed of Fibonacci sequence dielectrics and graphene at terahertz frequencies. Two Fibonacci sequence dielectrics, viz. aperiodic photonic lattices, are utilized for enhancing band-edge resonances and achieving the electric field localization [...] Read more.
We explore the optical bistability in aperiodic parity–time-symmetric (PT-symmetric) photonic lattices that are composed of Fibonacci sequence dielectrics and graphene at terahertz frequencies. Two Fibonacci sequence dielectrics, viz. aperiodic photonic lattices, are utilized for enhancing band-edge resonances and achieving the electric field localization that can enhance the nonlinearity of graphene. Modulating the gain-loss factor of dielectrics in the PT symmetry lattices further strengthens the nonlinearity effect and, consequently, low threshold bistability is realized. The interval between the upper and lower bistability thresholds enlarges as the momentum relaxation time of graphene changes. Moreover, we show that the bistability threshold can also be flexibly tuned by modulating the graphene chemical potential. The study might be applied in photomemories and optical switches. Full article
(This article belongs to the Special Issue Recent Advances in Nonlinear Optics at the Nanoscale)
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15 pages, 6499 KiB  
Article
Dynamics of Multipole Solitons and Vortex Solitons in PT-Symmetric Triangular Lattices with Nonlocal Nonlinearity
by Jing Huang, Yuanhang Weng, Peijun Chen and Hong Wang
Appl. Sci. 2019, 9(18), 3731; https://doi.org/10.3390/app9183731 - 7 Sep 2019
Cited by 1 | Viewed by 2216
Abstract
We investigate the evolution dynamics of solitons with complex structures in the PT-symmetric triangular lattices with nonlocal nonlinearity, including dipole solitons, six-pole solitons, and vortex solitons. Dipole solitons can be linearly stable with a small degree of gain/loss, while six-pole solitons can only [...] Read more.
We investigate the evolution dynamics of solitons with complex structures in the PT-symmetric triangular lattices with nonlocal nonlinearity, including dipole solitons, six-pole solitons, and vortex solitons. Dipole solitons can be linearly stable with a small degree of gain/loss, while six-pole solitons can only be stable when both the degree of gain/loss and the degree of nonlocality are small. For unstable solitons, some humps will decay quickly or new hotspots will appear during propagation. According to the existence range of dipole solitons, the multipole solitons tend to exist in PT-symmetric triangular lattices whose nonlocal nonlinearity is intermediate. We also consider the vortex solitons with high topological charges in the same triangular lattices and find that their profiles are codetermined by the propagation constant, degree of nonlocality, and topological charge. Full article
(This article belongs to the Special Issue Recent Advances in Nonlinear Optics at the Nanoscale)
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Review

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18 pages, 1912 KiB  
Review
Off-Resonance Control and All-Optical Switching: Expanded Dimensions in Nonlinear Optics
by David S. Bradshaw, Kayn A. Forbes and David L. Andrews
Appl. Sci. 2019, 9(20), 4252; https://doi.org/10.3390/app9204252 - 11 Oct 2019
Cited by 14 | Viewed by 3079
Abstract
The theory of non-resonant optical processes with intrinsic optical nonlinearity, such as harmonic generation, has been widely understood since the advent of the laser. In general, such effects involve multiphoton interactions that change the population of each input optical mode or modes. However, [...] Read more.
The theory of non-resonant optical processes with intrinsic optical nonlinearity, such as harmonic generation, has been widely understood since the advent of the laser. In general, such effects involve multiphoton interactions that change the population of each input optical mode or modes. However, nonlinear effects can also arise through the input of an off-resonant laser beam that itself emerges unchanged. Many such effects have been largely overlooked. Using a quantum electrodynamical framework, this review provides detail on such optically nonlinear mechanisms that allow for a controlled increase or decrease in the intensity of linear absorption and fluorescence and in the efficiency of resonance energy transfer. The rate modifications responsible for these effects were achieved by the simultaneous application of an off-resonant beam with a moderate intensity, acting in a sense as an optical catalyst, conferring a new dimension of optical nonlinearity upon photoactive materials. It is shown that, in certain configurations, these mechanisms provide the basis for all-optical switching, i.e., the control of light-by-light, including an optical transistor scheme. The conclusion outlines other recently proposed all-optical switching systems. Full article
(This article belongs to the Special Issue Recent Advances in Nonlinear Optics at the Nanoscale)
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