Optical Properties of Nanoscale Materials

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 January 2024) | Viewed by 1570

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Guest Editor
School of Artificial Intelligence, Optics and Electronics, Northwestern Polytechnical University, Xi’an 710072, China.
Interests: ultra-fast pulse laser technology; nonlinear optics; nanoscale materials
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Special Issue Information

Dear Colleagues,

Nanotechnology is one of the most promising areas in science and technology in the new century. It is widely used in biomedicine, electronic information technology, material science, and other fields. Among them, nanoscale materials have significant advantages in physics, chemistry, catalysis, optics, magnetism, and mechanics due to their extremely fine grains, a large number of central atoms with grains located at grain boundaries and internal defects, and their inherent quantum size effect, small size effect, surface effect, and macroscopic quantum tunneling effect. In particular, the study of the optical properties of nanoscale materials has great scientific research value and broad application prospects. 

The present Special Issue of Nanomaterials aims to present the current state of the art in the use of nanoscale materials in nonlinear optical. Nonlinear optical phenomena refer to the nonlinear changes in the optical properties of materials under strong light, including multi-frequency, sum frequency, difference frequency, self-focusing, self-phase modulation, and so on. These phenomena are not only of great significance to basic optical science, but also widely used in information, energy, biology, and other fields. In the present Special Issue, we have invited contributions from leading groups in the field with the aim of providing a balanced view of the current state of the art in this discipline.

Dr. Jiang Wang
Guest Editor

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Keywords

  • nanoscale materials
  • nonlinear optical
  • thin film device
  • nonlinear optical effect
  • nonlinear optical material

Published Papers (1 paper)

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Research

15 pages, 3265 KiB  
Article
Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors
by Sangjun Lee and Sangin Kim
Nanomaterials 2023, 13(22), 2922; https://doi.org/10.3390/nano13222922 - 9 Nov 2023
Viewed by 1239
Abstract
As a perfect graphene absorber without any external mirrors, we proposed asymmetric slot-assisted grating structures supporting two degenerate resonant modes of the guided-mode resonances (GMR) and the quasi-bound states in the continuum (quasi-BIC). The GMR mode functions as an internal mirror in conjunction [...] Read more.
As a perfect graphene absorber without any external mirrors, we proposed asymmetric slot-assisted grating structures supporting two degenerate resonant modes of the guided-mode resonances (GMR) and the quasi-bound states in the continuum (quasi-BIC). The GMR mode functions as an internal mirror in conjunction with the background scattering, while the quasi-BIC, which is responsible for perfect graphene absorption, stems from the horizontal symmetry breaking by an asymmetric slot. By properly shifting the slot center from the grating center, the leakage rate of quasi-BIC can be controlled in such a way as to satisfy the critical coupling condition. We provide a comprehensive study on the coupling mechanism of two degenerate resonant modes for a one-port system mimicking the resonance. We also numerically demonstrated that our proposed grating structures show an excellent reflection-type modulation performance at optical wavelength ranges when doped double-layer graphene is applied. Due to the perfect absorption at the OFF state, a high modulation depth of ~50 dB can be achieved via a small Fermi level variation of ~0.05 eV. To obtain the lower insertion loss at the ON state, the higher Fermi level is required to decrease the graphene absorption coefficient. Full article
(This article belongs to the Special Issue Optical Properties of Nanoscale Materials)
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