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Investigation on Optical Phenomena of Micro/Nano Materials/Structures

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Dr. Tianyue Zhang

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Institute of Photonics Technology, Jinan University, Guangzhou 511443, China
Interests: nano-optics; nanophotonics; metamaterials; plasmonics

Special Issue Information

Dear Colleagues,

Materials and structures in micro-/nano dimensions have revealed unprecedented optical phenomena, which open up the rapidly developing fields of nanophotonics, metamaterials, photonic crystals, and plasmonics. This Special Issue aims to provide a forum for discussion about the recent efforts and advances in the investigation of various optical phenomena based on subwavelength-scale light–matter interactions.

The scope of this Special Issue includes fundamental research on the optical properties of varieties of micro-/nanomaterials/-structures, as well as applied research in multiple novel applications. It covers a broad range of topics including, but not limited to, the following areas:

Plasmonics: metallic nanostructures and their optical properties;
Metamaterials, metasurfaces, metadevices, fundamentals and applications;
Nanophotonic concepts and devices for solar energy harvesting and conversion;
Near-field optical microscopy;
Light–matter interactions in nanocavities, nanolasers;
Nanostructures, nanoparticles, nanotubes, nanowires, nanowaveguides, and nanofibers;
Integrated silicon photonics;
Semiconductor quantum dots;
Two-dimensional materials;
Ultrafast and nonlinear optical responses in nanomaterials and -structures;
Optical manipulation techniques;
Nano-biophotonics;
Optofluidics;
Optomechanics;
System applications based on nanophotonic devices;
Nanofabrication techniques, thin-film processing, and self-assembly.

Dr. Tianyue Zhang
Guest Editor

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Research

16 pages, 5303 KiB

Open AccessArticle

Inversion of the Complex Refractive Index of Au-Ag Alloy Nanospheres Based on the Contour Intersection Method

by Long Cheng, Paerhatijiang Tuersun, Dengpan Ma, Dilishati Wumaier and Yixuan Li

Materials 2023, 16(9), 3291; https://doi.org/10.3390/ma16093291 - 22 Apr 2023

Viewed by 1347

Abstract

The contour intersection method is a new method used to invert the complex refractive index of small particles. Research has yet to be reported on using this method to invert the complex refractive index of nanoparticles. This paper reports the feasibility and reliability of the contour intersection method in the inversion of the complex refractive index of nanoparticles using Au-Ag alloy nanospheres. The Mie theory and the size-dependent dielectric function are used to calculate the light scattering and absorption efficiency of Au-Ag alloy nanospheres corresponding to the complex refractive index. The complex refractive index of the particles is obtained by inversion with the contour intersection method. The backscattering efficiency constraint method is used to determine the unique solution when multiple valid solutions from the contour intersection method appear. The effects of the Au component percentage, particle size, and measurement errors on the inversion results are quantitatively analyzed. Finally, the inversion accuracy is compared and analyzed with the traditional iterative method. The results show that as long as the light scattering efficiency, light absorption efficiency, and backscattering efficiency of Au nanospheres can be measured, the accurate complex refractive index can also be calculated by inversion using the contour intersection method. The accuracy of the inversion results can be ensured when the measurement error is less than 5%. The results of inversion using the contour intersection method are better than those of the iterative methods under the same conditions. This study provides a simple and reliable inversion method for measuring the complex refractive index of Au-Ag alloy nanospheres. Full article

(This article belongs to the Special Issue Investigation on Optical Phenomena of Micro/Nano Materials/Structures)

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13 pages, 448 KiB

Open AccessArticle

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

by Iliana Apostolova, Angel Apostolov and Julia Wesselinowa

Materials 2023, 16(6), 2353; https://doi.org/10.3390/ma16062353 - 15 Mar 2023

Cited by 2 | Viewed by 1161

Abstract

The influence of size and doping effects on the magnetization M, phonon

ω

and band gap energy

E_{g}

of MgO nanoparticles is studied using a microscopic model. The room-temperature ferromagnetism is due to surface or/and doping effects in MgO nanoparticles (NPs). [...] Read more.

The influence of size and doping effects on the magnetization M, phonon

ω

and band gap energy

E_{g}

of MgO nanoparticles is studied using a microscopic model. The room-temperature ferromagnetism is due to surface or/and doping effects in MgO nanoparticles (NPs). The influence of the spin–phonon interaction is discussed. M increases with decreasing NP size. M and

E_{g}

can increase or decrease by different ion doping (Co, Al, La, Fe) due to the different strain that appears. It changes the lattice parameters and the exchange interaction constants. We found that MgO NP with size of 20 nm and Fe- or Co-doping concentration x = 0.1 and x = 0.2, respectively, have a Curie temperature

T_{C}

= 315 K, i.e., they are appropriate for application in magnetic hyperthermia, they satisfy the conditions for that. The energy of the phonon mode

ω

= 448 cm

^{- 1}

increases with decreasing NP size. It increases with increasing Co and Fe, or decreases with Sr ion doping. Full article

(This article belongs to the Special Issue Investigation on Optical Phenomena of Micro/Nano Materials/Structures)

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