Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
7.4
5.3
Journals
Nanomaterials
Special Issues
Nano-Optics: Novel Research on Theory and Applications
share announcement

Nano-Optics: Novel Research on Theory and Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Theory and Simulation of Nanostructures".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 15002

Special Issue Editor

Prof. Dr. Doo Jae Park

E-Mail Website
Guest Editor
School of Nano Convergence Technology, Hallym University, Chuncheon, Korea

Special Issue Information

The splendid achievements in the field of nano-optics during the last few decades have opened up novel research areas, such as near-field surface plasmon-coupled excitation, metamaterials, invisibility cloaks, and epsilon near-zero materials. Hundreds of theoretical and experimental research works have revealed that the electromagnetic field around nano-optical objects has various physical properties, e.g., huge field enhancement and confinement and a corresponding increase in optical interaction with matters. Such distinct properties of nano-optical objects enable outstanding applications, such as sensitive molecular detection, superlenses, and ultrafast electron generation.

In this Special Issue, we aim to cover the current achievements in the theoretical works and applications of nano-optical phenomena. Full papers, communications, and reviews are welcomed. Potential topics include, but are not limited to:

  1. Theory and simulations of electromagnetic fields in nano-optical objects;
  2. Nano-optical light–matter interactions and their mechanism;
  3. Nano-optical applications for material characterization, e.g., surface-enhanced Raman scattering, tip-enhanced Raman scattering, and luminescence enhancement;
  4. Novel applications of artificial atoms, i.e., metamaterials and epsilon near-zero materials;
  5. Development of novel observation technique for nano-optical objects.

Prof. Dr. Doo Jae Park
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. Nanomaterials 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 2900 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

  • Nanomaterials
  • Nano-optics
  • Light-matter interaction
  • Field enhancement
  • Metamaterials

Published Papers (5 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

18 pages, 4605 KiB  
Article
Generation of Reference Softgauges for Minimum Zone Fitting Algorithms: Case of Aspherical and Freeform Surfaces
by Amine Chiboub, Yassir Arezki, Alain Vissiere, Charyar Mehdi-Souzani, Nabil Anwer, Bandar Alzahrani, Mohamed Lamjed Bouazizi and Hichem Nouira
Nanomaterials 2021, 11(12), 3386; https://doi.org/10.3390/nano11123386 - 14 Dec 2021
Cited by 2 | Viewed by 1747
Abstract
Optical aspherical lenses with high surface quality are increasingly demanded in several applications in medicine, synchrotron, vision, etc. To reach the requested surface quality, most advanced manufacturing processes are used in closed chain with high precision measurement machines. The measured data are analysed [...] Read more.
Optical aspherical lenses with high surface quality are increasingly demanded in several applications in medicine, synchrotron, vision, etc. To reach the requested surface quality, most advanced manufacturing processes are used in closed chain with high precision measurement machines. The measured data are analysed with least squares (LS or L2-norm) or minimum zone (MZ) fitting (also Chebyshev fitting or L∞-norm) algorithms to extract the form error. Performing data fitting according to L∞-norm is more accurate and challenging than L2-norm, since it directly minimizes peak-to-valley (PV). In parallel, reference softgauges are used to assess the performance of the implemented MZ fitting algorithms, according to the F1 algorithm measurement standard, to guarantee their traceability, accuracy and robustness. Reference softgauges usually incorporate multiple parameters related to manufacturing processes, measurement errors, points distribution, etc., to be as close as possible to the real measured data. In this paper, a unique robust approach based on a non-vertex solution is mathematically formulated and implemented for generating reference softgauges for complex shapes. Afterwards, two implemented MZ fitting algorithms (HTR and EPF) were successfully tested on a number of generated reference pairs. The evaluation of their performance was carried out through two metrics: degree of difficulty and performance measure. Full article
(This article belongs to the Special Issue Nano-Optics: Novel Research on Theory and Applications)
►▼ Show Figures

Figure 1

9 pages, 14958 KiB  
Article
Angstrom-Scale Active Width Control of Nano Slits for Variable Plasmonic Cavity
by Dukhyung Lee, Dohee Lee, Hyeong Seok Yun and Dai-Sik Kim
Nanomaterials 2021, 11(9), 2463; https://doi.org/10.3390/nano11092463 - 21 Sep 2021
Cited by 3 | Viewed by 2300
Abstract
Nanogap slits can operate as a plasmonic Fabry–Perot cavity in the visible and infrared ranges due to the gap plasmon with an increased wavenumber. Although the properties of gap plasmon are highly dependent on the gap width, active width tuning of the plasmonic [...] Read more.
Nanogap slits can operate as a plasmonic Fabry–Perot cavity in the visible and infrared ranges due to the gap plasmon with an increased wavenumber. Although the properties of gap plasmon are highly dependent on the gap width, active width tuning of the plasmonic cavity over the wafer length scale was barely realized. Recently, the fabrication of nanogap slits on a flexible substrate was demonstrated to show that the width can be adjusted by bending the flexible substrate. In this work, by conducting finite element method (FEM) simulation, we investigated the structural deformation of nanogap slit arrays on an outer bent polydimethylsiloxane (PDMS) substrate and the change of the optical properties. We found that the tensile deformation is concentrated in the vicinity of the gap bottom to widen the gap width proportionally to the substrate curvature. The width widening leads to resonance blueshift and field enhancement decrease. Displacement ratio ((width change)/(supporting stage translation)), which was identified to be proportional to the substrate thickness and slit period, is on the order of 10−5 enabling angstrom-scale width control. This low displacement ratio comparable to a mechanically controllable break junction highlights the great potential of nanogap slit structures on a flexible substrate, particularly in quantum plasmonics. Full article
(This article belongs to the Special Issue Nano-Optics: Novel Research on Theory and Applications)
►▼ Show Figures

Figure 1

14 pages, 2635 KiB  
Article
Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics
by Patrick Rufangura, Iryna Khodasevych, Arti Agrawal, Matteo Bosi, Thomas G. Folland, Joshua D. Caldwell and Francesca Iacopi
Nanomaterials 2021, 11(9), 2339; https://doi.org/10.3390/nano11092339 - 08 Sep 2021
Cited by 7 | Viewed by 3105
Abstract
The mid-infrared (MIR) is an exciting spectral range that also hosts useful molecular vibrational fingerprints. There is a growing interest in nanophotonics operating in this spectral range, and recent advances in plasmonic research are aimed at enhancing MIR infrared nanophotonics. In particular, the [...] Read more.
The mid-infrared (MIR) is an exciting spectral range that also hosts useful molecular vibrational fingerprints. There is a growing interest in nanophotonics operating in this spectral range, and recent advances in plasmonic research are aimed at enhancing MIR infrared nanophotonics. In particular, the design of hybrid plasmonic metasurfaces has emerged as a promising route to realize novel MIR applications. Here we demonstrate a hybrid nanostructure combining graphene and silicon carbide to extend the spectral phonon response of silicon carbide and enable absorption and field enhancement of the MIR photon via the excitation and hybridization of surface plasmon polaritons and surface phonon polaritons. We combine experimental methods and finite element simulations to demonstrate enhanced absorption of MIR photons and the broadening of the spectral resonance of graphene-coated silicon carbide nanowires. We also indicate subwavelength confinement of the MIR photons within a thin oxide layer a few nanometers thick, sandwiched between the graphene and silicon carbide. This intermediate shell layer is characteristically obtained using our graphitization approach and acts as a coupling medium between the core and outer shell of the nanowires. Full article
(This article belongs to the Special Issue Nano-Optics: Novel Research on Theory and Applications)
►▼ Show Figures

Graphical abstract

9 pages, 5209 KiB  
Article
High-Speed Imaging of Second-Harmonic Generation in MoS2 Bilayer under Femtosecond Laser Ablation
by Young Chul Kim, Hoseong Yoo, Van Tu Nguyen, Soonil Lee, Ji-Yong Park and Yeong Hwan Ahn
Nanomaterials 2021, 11(7), 1786; https://doi.org/10.3390/nano11071786 - 09 Jul 2021
Cited by 5 | Viewed by 3899
Abstract
We report an in situ characterization of transition-metal dichalcogenide (TMD) monolayers and twisted bilayers using a high-speed second-harmonic generation (SHG) imaging technique. High-frequency laser modulation and galvano scanning in the SHG imaging enabled a rapid identification of the crystallinity in the TMD, including [...] Read more.
We report an in situ characterization of transition-metal dichalcogenide (TMD) monolayers and twisted bilayers using a high-speed second-harmonic generation (SHG) imaging technique. High-frequency laser modulation and galvano scanning in the SHG imaging enabled a rapid identification of the crystallinity in the TMD, including the orientation and homogeneity with a speed of 1 frame/s. For a twisted bilayer MoS2, we studied the SHG peak intensity and angles as a function of the twist angle under a strong interlayer coupling. In addition, rapid SHG imaging can be used to visualize laser-induced ablation of monolayer and bilayer MoS2 in situ under illumination by a strong femtosecond laser. Importantly, we observed a characteristic threshold behavior; the ablation process occurred for a very short time duration once the preheating condition was reached. We investigated the laser thinning of the bilayer MoS2 with different twist angles. When the twist angle was 0°, the SHG decreased by approximately one-fourth of the initial intensity when one layer was removed. Conversely, when the twist angle was approximately 60° (the SHG intensity was suppressed), the SHG increased abruptly close to that of the nearby monolayer when one layer was removed. Precise layer-by-layer control was possible because of the unique threshold behavior of the laser-induced ablation. Full article
(This article belongs to the Special Issue Nano-Optics: Novel Research on Theory and Applications)
►▼ Show Figures

Figure 1

9 pages, 1534 KiB  
Article
Ultra-Narrow Metallic Nano-Trenches Realized by Wet Etching and Critical Point Drying
by Jeeyoon Jeong, Hyosim Yang, Seondo Park, Yun Daniel Park and Dai-Sik Kim
Nanomaterials 2021, 11(3), 783; https://doi.org/10.3390/nano11030783 - 19 Mar 2021
Cited by 6 | Viewed by 3072
Abstract
A metallic nano-trench is a unique optical structure capable of ultrasensitive detection of molecules, active modulation as well as potential electrochemical applications. Recently, wet-etching the dielectrics of metal–insulator–metal structures has emerged as a reliable method of creating optically active metallic nano-trenches with a [...] Read more.
A metallic nano-trench is a unique optical structure capable of ultrasensitive detection of molecules, active modulation as well as potential electrochemical applications. Recently, wet-etching the dielectrics of metal–insulator–metal structures has emerged as a reliable method of creating optically active metallic nano-trenches with a gap width of 10 nm or less, opening a new venue for studying the dynamics of nanoconfined molecules. Yet, the high surface tension of water in the process of drying leaves the nano-trenches vulnerable to collapsing, limiting the achievable width to no less than 5 nm. In this work, we overcome the technical limit and realize metallic nano-trenches with widths as small as 1.5 nm. The critical point drying technique significantly alleviates the stress applied to the gap in the drying process, keeping the ultra-narrow gap from collapsing. Terahertz spectroscopy of the trenches clearly reveals the signature of successful wet etching of the dielectrics without apparent damage to the gap. We expect that our work will enable various optical and electrochemical studies at a few-molecules-thick level. Full article
(This article belongs to the Special Issue Nano-Optics: Novel Research on Theory and Applications)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-5
Back to TopTop