Special Issue "Optical Properties of Nanomaterials: Experimental and Computational Studies"

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

Deadline for manuscript submissions: 10 May 2023 | Viewed by 1490

Special Issue Editors

1. Higher School of Engineering Physics, Peter the Great St. Petersburg Polytechnic University, Politekhnicheskaya 29, 195251 St. Petersburg, Russia
2. Center for Nanotechnologies, St. Petersburg Academic University (Alferov University), Khlopina 8/3, 194021 St. Petersburg, Russia
Interests: III-V semiconductors; carbon materials; nanophotonics; optoelectronics; epitaixial and nanotechnologies; microfluidics; solar cells; light-emitting diodes; photodectors
Special Issues, Collections and Topics in MDPI journals
1. Higher School of Engineering Physics, Peter the Great St. Petersburg Polytechnic University, Politekhnicheskaya 29, 195251 St. Petersburg, Russia
2. Center for Nanotechnologies, St. Petersburg Academic University (Alferov University), Khlopina 8/3, 194021 St. Petersburg, Russia
Interests: III-V; optoelectronics; nanophotonics; epitaixial technologies; solar cells; light-emitting diodes; photodectors

Special Issue Information

Dear Colleagues,

A study of the optical properties of nanomaterials is essential in terms of fundamental and practical perspectives. Surface and dimensional confinement effects can significantly alter the optical response, crystal, and electronic structure (band gap engineering) of the structure compared to its bulk counterpart. In turn, nanomaterials can manifest a variety of strong plasmonic and photonic optical resonances that enhance the strength of light–matter interaction. The latter can also be enhanced through the appropriate design of nanostructures with a given periodic arrangement and shape. The interference effects, symmetry-breaking, or non-trivial topology, can lead to the photonic bandgap opening and give rise to highly localized states of light in such materials. Thus, nanomaterials providing strong light localization can control spontaneous emission rate (Purcell effect) and enhance their nonlinear optical response, which is essential for harmonic generation, wave mixing, and all-optical switching. Thus, nanostructures are promising platforms for future quantum optoelectronic applications.

The high surface-to-volume ratio of nanomaterials and, thus, the strong effect of the local environment on the optical and electronic properties provides outstanding advantages for sensor applications (e.g. single-molecule sensing). Functional optical nanomaterials enable the implementation of both active and passive photonic devices and building blocks operating beyond the diffraction limit, such as nanoscale light emitters and detectors, waveguides, frequency mixers, and nonlinear frequency converters.

Modern fabrication approaches involve several advanced technologies combining the bottom-up and top-down approaches, which provide the fabrication of nanostructures with nanometer-scale precision controlled sizes, shapes, and compositions. Material systems consist of (but are not limited to): epitaxial nanoheterostructures and quantum dots, perovskite and complex oxide nanostructures, carbon materials, 2D materials and van der Waals heterostructures, all-dielectric, plasmonic and hybrid nanostructures, and composite and colloidal nanostructured materials.

This Special Issue provides a venue for researchers to discuss the recent progress of nanofabrication techniques for the fabrication of functional optical nanomaterials, as well as their fundamental experimental and computational studies that enable the development of new emerging photonic and optoelectronic applications.

Dr. Ivan Mukhin
Dr. Vladimir V. Fedorov
Guest Editors

Manuscript Submission Information

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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.

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Keywords

  • light confinement
  • band gap engineering
  • waveguides
  • optical nanoantennas
  • nanoheterostructures
  • nonlinear response
  • III-V
  • 2D materials
  • perovskites
  • organic materials

Published Papers (2 papers)

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Research

Article
Switchable Ultra-Wideband All-Optical Quantum Dot Reflective Semiconductor Optical Amplifier
Nanomaterials 2023, 13(4), 685; https://doi.org/10.3390/nano13040685 - 10 Feb 2023
Viewed by 573
Abstract
A comprehensive study has been conducted on ultra-broadband optically pumped quantum dot (QD) reflective semiconductor optical amplifiers (QD-RSOAs). Furthermore, little work has been done on broadband QD-RSOAs with an optical pump. About 1 μm optical bandwidth, spanning 800 nm up to 1800 nm, [...] Read more.
A comprehensive study has been conducted on ultra-broadband optically pumped quantum dot (QD) reflective semiconductor optical amplifiers (QD-RSOAs). Furthermore, little work has been done on broadband QD-RSOAs with an optical pump. About 1 μm optical bandwidth, spanning 800 nm up to 1800 nm, is supported for the suggested device by superimposing nine groups of QDs. It has been shown that the device can be engineered to amplify a selected window or a group of desired windows. Moreover, the operation of the device has been thoroughly investigated by solving the coupled differential rate and signal propagation equations. A numerical algorithm has been suggested to solve these equations. As far as we are concerned, a broadband optically pumped QD-RSOA that can operate as a filter has been introduced. Full article
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Article
Investigations of Optical Functions and Optical Transitions of 2D Semiconductors by Spectroscopic Ellipsometry and DFT
Nanomaterials 2023, 13(1), 196; https://doi.org/10.3390/nano13010196 - 01 Jan 2023
Viewed by 679
Abstract
Optical functions and transitions are essential for a material to reveal the light–matter interactions and promote its applications. Here, we propose a quantitative strategy to systematically identify the critical point (CP) optical transitions of 2D semiconductors by combining the spectroscopic ellipsometry (SE) and [...] Read more.
Optical functions and transitions are essential for a material to reveal the light–matter interactions and promote its applications. Here, we propose a quantitative strategy to systematically identify the critical point (CP) optical transitions of 2D semiconductors by combining the spectroscopic ellipsometry (SE) and DFT calculations. Optical functions and CPs are determined by SE, and connected to DFT band structure and projected density of states via equal-energy and equal-momentum lines. The combination of SE and DFT provides a powerful tool to investigate the CP optical transitions, including the transition energies and positions in Brillouin zone (BZ), and the involved energy bands and carries. As an example, the single-crystal monolayer WS2 is investigated by the proposed method. Results indicate that six excitonic-type CPs can be quantitatively distinguished in optical function of the monolayer WS2 over the spectral range of 245–1000 nm. These CPs are identified as direct optical transitions from three highest valence bands to three lowest conduction bands at high symmetry points in BZ contributed by electrons in S-3p and W-5d orbitals. Results and discussion on the monolayer WS2 demonstrate the effectiveness and advantages of the proposed method, which is general and can be easily extended to other materials. Full article
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