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Nanomaterials
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Nano-Photonics and Meta-Nanomaterials
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Nano-Photonics and Meta-Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanophotonics Materials and Devices".

Deadline for manuscript submissions: closed (10 May 2024) | Viewed by 14819

Special Issue Editor

Dr. Suchand Sandeep

E-Mail Website
Guest Editor
Centre for Optical and Laser Engineering, Nanyang Technological University, Singapore
Interests: ultrafast processes; laser material processing; bio-optics; optical Instrumentation; carrier dynamics; metamaterials; nanophotonics

Special Issue Information

Dear Colleagues,

Over the past few decades, nanomaterials and metamaterials have revolutionized the landscape of optical sciences. Highly enhanced electromagnetic fields typically associated with nanomaterials allow strong light-matter interaction, leading to exotic responses. Recent advances in nanofabrication have made it possible to create intelligently engineered nanostructures of subwavelength dimensions with controllable optical properties for various applications. Photonics and biophotonics are two areas that have benefitted immensely from such nano-engineered materials. This Special Issue aims to showcase the latest developments in nanophotonics, bio-nanophotonics, and their application domains. Areas of interest include recent developments in nanophotonic science enabling breakthroughs in key areas such as communication, biomedical and life sciences, information sciences, super-resolution imaging, metrology, energy harvesting, and sustainability. Potential topics include, but are not limited to:

  • nanomaterials for photonics and plasmonics;
  • metamaterials, photonic crystals, and metasurfaces;
  • green nanophotonics including solar energy conversion;
  • topological photonics;
  • nanobiophotonics: sensing and imaging;
  • nano-optoelectronics;
  • nonlinear optics at nanoscale;
  • quantum plasmonics.

Dr. Suchand Sandeep
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

  • metamaterials
  • nanophotonics
  • plasmonics
  • biophotonics
  • metaoptics
  • two-dimensional materials
  • topological photonics
  • nanoscale optics
  • super-resolution imaging

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Published Papers (7 papers)

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Research

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12 pages, 2530 KiB  
Article
Periodic Surface Structuring of Copper with Spherical and Cylindrical Lenses
by Meilin Hu, Jijil JJ Nivas, Martina D’Andrea, Mohammadhassan Valadan, Rosalba Fittipaldi, Mariateresa Lettieri, Antonio Vecchione, Carlo Altucci and Salvatore Amoruso
Nanomaterials 2023, 13(6), 1005; https://doi.org/10.3390/nano13061005 - 10 Mar 2023
Cited by 2 | Viewed by 1737
Abstract
The use of a cylindrical lens in femtosecond laser surface structuring is receiving attention to improve the processing efficiency. Here, we investigate the structures produced on a copper target, in air, by exploiting both spherical and cylindrical lenses for beam focusing, aiming at [...] Read more.
The use of a cylindrical lens in femtosecond laser surface structuring is receiving attention to improve the processing efficiency. Here, we investigate the structures produced on a copper target, in air, by exploiting both spherical and cylindrical lenses for beam focusing, aiming at elucidating similarities and differences of the two approaches. The morphological features of the surface structures generated by ≈180 fs laser pulses at 1030 nm over areas of 8 × 8 mm2 were analyzed. For the spherical lens, micron-sized parallel channels are formed on the target surface, which is covered by subwavelength ripples and nanoparticles. Instead, the cylindrical lens leads to a surface decorated with ripples and nanoparticles with a negligible presence of micro-channels. Moreover, the morphological features achieved by focusing ≈180 fs laser pulses at 515 nm with the cylindrical lens and varying the scanning parameters were also studied. The experimental results evidence a direct effect of the hatch distance used in the scanning process on the target surface that contains dark and bright bands corresponding to regions where the rippled surface contains a richer decoration or a negligible redeposition of nanoparticles. Our findings can be of interest in large area surface structuring for the selection of the more appropriate focusing configuration according to the final application of the structured surface. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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14 pages, 6986 KiB  
Article
Plasmonic Sensing and Switches Enriched by Tailorable Multiple Fano Resonances in Rotational Misalignment Metasurfaces
by Xiaofeng Xu, Xiao-Qing Luo, Qinke Liu, Yan Li, Weihua Zhu, Zhiyong Chen, Wuming Liu and Xin-Lin Wang
Nanomaterials 2022, 12(23), 4226; https://doi.org/10.3390/nano12234226 - 28 Nov 2022
Cited by 5 | Viewed by 1790
Abstract
Fano resonances that feature strong field enhancement in the narrowband range have motivated extensive studies of light–matter interactions in plasmonic nanomaterials. Optical metasurfaces that are subject to different mirror symmetries have been dedicated to achieving nanoscale light manipulation via plasmonic Fano resonances, thus [...] Read more.
Fano resonances that feature strong field enhancement in the narrowband range have motivated extensive studies of light–matter interactions in plasmonic nanomaterials. Optical metasurfaces that are subject to different mirror symmetries have been dedicated to achieving nanoscale light manipulation via plasmonic Fano resonances, thus enabling advantages for high-sensitivity optical sensing and optical switches. Here, we investigate the plasmonic sensing and switches enriched by tailorable multiple Fano resonances that undergo in-plane mirror symmetry or asymmetry in a hybrid rotational misalignment metasurface, which consists of periodic metallic arrays with concentric C-shaped- and circular-ring-aperture unit cells. We found that the plasmonic double Fano resonances can be realized by undergoing mirror symmetry along the X-axis. The plasmonic multiple Fano resonances can be tailored by adjusting the level of the mirror asymmetry along the Z-axis. Moreover, the Fano-resonance-based plasmonic sensing that suffer from mirror symmetry or asymmetry can be implemented by changing the related structural parameters of the unit cells. The passive dual-wavelength plasmonic switches of specific polarization can be achieved within mirror symmetry and asymmetry. These results could entail benefits for metasurface-based devices, which are also used in sensing, beam-splitter, and optical communication systems. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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8 pages, 1350 KiB  
Article
Magneto-Optical Spectroscopy of Short Spin Waves by All-Dielectric Metasurface
by Daria O. Ignatyeva and Vladimir I. Belotelov
Nanomaterials 2022, 12(23), 4180; https://doi.org/10.3390/nano12234180 - 25 Nov 2022
Cited by 2 | Viewed by 1708
Abstract
The optical method of spin dynamics measurements via the detection of various magneto-optical effects is widely used nowadays. Besides it being a convenient method to achieve time-resolved measurements, its spatial resolution in the lateral direction is limited by a diffraction limit for the [...] Read more.
The optical method of spin dynamics measurements via the detection of various magneto-optical effects is widely used nowadays. Besides it being a convenient method to achieve time-resolved measurements, its spatial resolution in the lateral direction is limited by a diffraction limit for the probe light. We propose a novel approach utilizing a Mie-resonance-based all-dielectric metasurface that allows for the extraction of a signal of a single submicron-wavelength spin wave from the wide spin precession spectra. This approach is based on the possibility of designing a metasurface that possesses nonuniform magneto-optical sensitivity to the different nanoscale regions of the smooth magnetic film due to the excitation of the Mie modes. The metasurface is tuned to be unsensitive to the long-wavelength spin precession, which is achieved by the optical resonance-caused zeroing of the magneto-optical effect for uniform magnetization in the vicinity of the resonance. At the same time, such a Mie-supporting metasurface exhibits selective sensitivity to a narrow range of short wavelengths equal to its period. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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9 pages, 3246 KiB  
Article
Fano-Resonant Metasurface with 92% Reflectivity Based on Lithium Niobate on Insulator
by Leshu Liu, Ken Liu, Ning Liu, Zhihong Zhu and Jianfa Zhang
Nanomaterials 2022, 12(21), 3849; https://doi.org/10.3390/nano12213849 - 31 Oct 2022
Cited by 3 | Viewed by 2106
Abstract
Lithium niobate is an excellent optoelectronic and nonlinear material, which plays an important role in integrated optics. However, lithium niobate is difficult to etch due to its very stable chemical nature, and the microstructure of lithium niobate’s metasurface is generally of subwavelength, which [...] Read more.
Lithium niobate is an excellent optoelectronic and nonlinear material, which plays an important role in integrated optics. However, lithium niobate is difficult to etch due to its very stable chemical nature, and the microstructure of lithium niobate’s metasurface is generally of subwavelength, which further increases its processing difficulty. Here, by using Ar+-based inductively coupled plasma etching and KOH wet etching, we improve the etching quality and fabricate a Fano-resonant metasurface based on lithium niobate on insulator, which has a very high reflectivity of 92% at near-infrared wavelength and the potential of becoming a high-reflectivity film. In addition, to evaluate the practical performance of the metasurface, we constructed a Fabry–Perot cavity by using it as a cavity mirror, whose reflection spectrum shows a finesse of 38. Our work paves the way for the development of functional metasurfaces and other advanced photonic devices based on lithium niobate on insulator. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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10 pages, 3439 KiB  
Article
An Infrared Ultra-Broadband Absorber Based on MIM Structure
by Meichen Li, Guan Wang, Yang Gao and Yachen Gao
Nanomaterials 2022, 12(19), 3477; https://doi.org/10.3390/nano12193477 - 4 Oct 2022
Cited by 11 | Viewed by 2336
Abstract
We designed an infrared ultra-broadband metal–insulator–metal (MIM)-based absorber which is composed of a top layer with four different chromium (Cr) nano-rings, an intermediate media of aluminum trioxide (Al2O3), and a bottom layer of tungsten (W). By using the finite-difference [...] Read more.
We designed an infrared ultra-broadband metal–insulator–metal (MIM)-based absorber which is composed of a top layer with four different chromium (Cr) nano-rings, an intermediate media of aluminum trioxide (Al2O3), and a bottom layer of tungsten (W). By using the finite-difference time-domain (FDTD), the absorption performance of the absorber was studied theoretically. The results indicate that the average absorption of the absorber can reach 94.84% in the wavelength range of 800–3000 nm. The analysis of the electric and magnetic field indicates that the ultra-broadband absorption rate results from the effect of local surface plasmon resonance (LSPR). After that, the effect of structural parameters, metal and dielectric materials on the absorptivity of the absorber was also discussed. Finally, the effect of incidence angle on absorption was investigated. It was found that it is not sensitive to incidence angle; even when incidence angle is 30°, average absorptivity can reach 90%. The absorber is easy to manufacture and simple in structure, and can be applied in infrared detection and optical imaging. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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21 pages, 5203 KiB  
Article
A New Texturing Approach of a Polyimide Shielding Cover for Enhanced Light Propagation in Photovoltaic Devices
by Iuliana Stoica, Raluca Marinica Albu, Camelia Hulubei, Dragos George Astanei, Radu Burlica, Gaber A. M. Mersal, Tarek A. Seaf Elnasr, Andreea Irina Barzic and Ashraf Y. Elnaggar
Nanomaterials 2022, 12(18), 3249; https://doi.org/10.3390/nano12183249 - 19 Sep 2022
Cited by 2 | Viewed by 2006
Abstract
The efficiency of photovoltaics (PVs) is related to cover material properties and light management in upper layers of the device. This article investigates new polyimide (PI) covers for PVs that enable light trapping through their induced surface texture. The latter is attained via [...] Read more.
The efficiency of photovoltaics (PVs) is related to cover material properties and light management in upper layers of the device. This article investigates new polyimide (PI) covers for PVs that enable light trapping through their induced surface texture. The latter is attained via a novel strategy that involves multi-directional rubbing followed by plasma exposure. Atomic force microscopy (AFM) is utilized to clarify the outcome of the proposed light-trapping approach. Since a deep clarification of either random or periodic surface morphology is responsible for the desired light capturing in solar cells, the elaborated texturing procedure generates a balance among both discussed aspects. Multidirectional surface abrasion with sand paper on pre-defined directions of the PI films reveals some relevant modifications regarding both surface morphology and the resulted degree of anisotropy. The illuminance experiments are performed to examine if the created surface texture is suitable for proper light propagation through the studied PI covers. The adhesion among the upper layers of the PV, namely the PI and transparent electrode, is evaluated. The correlation between the results of these analyses helps to identify not only adequate polymer shielding materials, but also to understand the chemical structure response to new design routes for light-trapping, which might significantly contribute to an enhanced conversion efficiency of the PV devices. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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Review

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23 pages, 5730 KiB  
Review
Lasing from Micro- and Nano-Scale Photonic Disordered Structures for Biomedical Applications
by R. Gayathri, C. S. Suchand Sandeep, C. Vijayan and V. M. Murukeshan
Nanomaterials 2023, 13(17), 2466; https://doi.org/10.3390/nano13172466 - 31 Aug 2023
Cited by 7 | Viewed by 2091
Abstract
A disordered photonic medium is one in which scatterers are distributed randomly. Light entering such media experiences multiple scattering events, resulting in a “random walk”-like propagation. Micro- and nano-scale structured disordered photonic media offer platforms for enhanced light–matter interaction, and in the presence [...] Read more.
A disordered photonic medium is one in which scatterers are distributed randomly. Light entering such media experiences multiple scattering events, resulting in a “random walk”-like propagation. Micro- and nano-scale structured disordered photonic media offer platforms for enhanced light–matter interaction, and in the presence of an appropriate gain medium, coherence-tunable, quasi-monochromatic lasing emission known as random lasing can be obtained. This paper discusses the fundamental physics of light propagation in micro- and nano-scale disordered structures leading to the random lasing phenomenon and related aspects. It then provides a state-of-the-art review of this topic, with special attention to recent advancements of such random lasers and their potential biomedical imaging and biosensing applications. Full article
(This article belongs to the Special Issue Nano-Photonics and Meta-Nanomaterials)
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