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Micromachines
Special Issues
Processing and Applications of Novel Optical Metamaterials
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Processing and Applications of Novel Optical Metamaterials

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 3332

Special Issue Editor

Dr. Xuejing Wang

E-Mail Website
Guest Editor
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Interests: functional nanocomposites; hybrid plasmonics; 2D heterostructures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The design and fabrication of functional heterostructures or nanostructures serve an important role in next-generation nanotechnologies, including biomedical sensing, energy storage, quantum computing, etc. The continuous shrinking of device size requires reliable, durable, and flexible material candidates, meanwhile seeking reproducible and cost-effective processing methods at the micro- or nanoscale is crucial. Previous studies have demonstrated enhanced anisotropy, multifunctionality, and tunability of hybrid structures by combining building blocks within the three-dimensional (3D) or two-dimensional (2D) material family, represented by hyperbolic metamaterials or metasurfaces with patterned optical resonators, thin film nanocomposites with embedded plasmonics nanostructures, as well as van der Waals heterostructures combining graphene, h-BN, and transition metal dichalcogenides (TMDs). Extending hybrid designs by coupling 3D with 2D candidates opens up more possibilities toward flexible device integration, thermal and optical sensors, and solar or optoelectronic applications. From a fundamental perspective, the sciences involved in structural and property tuning, interfacial coupling, and defect engineering will bridge the gap between material structures and functional performances to resolve more unknown puzzles and assist toward a better understanding in the field of nanomaterials research.

Dr. Xuejing Wang
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. Micromachines is an international peer-reviewed open access monthly 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 2600 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

  • nanostructure design
  • two-dimensional heterostructures
  • optical resonators
  • anisotropy
  • tunability

Published Papers (2 papers)

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Research

12 pages, 5291 KiB  
Article
Design of a Low-Reflection Flat Lens Antenna Based on Conformal Transformation Optics
by Fateme Nazarzadeh and Abbas Ali Heidari
Micromachines 2023, 14(3), 558; https://doi.org/10.3390/mi14030558 - 27 Feb 2023
Viewed by 1369
Abstract
In this paper, a wideband flat lens antenna with low reflection and good performance is presented based on conformal transformation optics (CTO). Physical space optimization is applied to eliminate singular refractive index values. Furthermore, we employ the optical path rescaling method to enhance [...] Read more.
In this paper, a wideband flat lens antenna with low reflection and good performance is presented based on conformal transformation optics (CTO). Physical space optimization is applied to eliminate singular refractive index values. Furthermore, we employ the optical path rescaling method to enhance the sub-unity refractive indices and to reduce reflection. Therefore, an implementable all-dielectric isotropic medium is obtained. The final flat lens profile comprises six layers with a constant permittivity value in each layer. Simulation results of the three-dimensional structure indicate that the designed flat lens operates in a wide frequency bandwidth. The flat lens antenna has an S11 value of less than −15 dB in the frequency range of 13 to 30 GHz. The proposed lens was designed and simulated using COMSOL Multiphysics, and radiation performance results were validated using the CST Studio Suite. The simulated radiation pattern shows that the side lobe level is less than −16.5 dB in two simulation software programs, and the half-power beam width varies from 5.6° to 2.7° with increasing frequency. Moreover, the simulated antenna gain is about 28.3–35.5 dBi in the 13–30 GHz frequency range. Full article
(This article belongs to the Special Issue Processing and Applications of Novel Optical Metamaterials)
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9 pages, 3012 KiB  
Article
Active Tuning and Anisotropic Strong Coupling of Terahertz Polaritons in Van der Waals Heterostructures
by Shaopeng Li, Junhao Xu and Yajie Xie
Micromachines 2022, 13(11), 1955; https://doi.org/10.3390/mi13111955 - 11 Nov 2022
Cited by 1 | Viewed by 1338
Abstract
Electromagnetic field confinement is significant in enhancing light-matter interactions as well as in reducing footprints of photonic devices especially in Terahertz (THz). Polaritons offer a promising platform for the manipulation of light at the deep sub-wavelength scale. However, traditional THz polariton materials lack [...] Read more.
Electromagnetic field confinement is significant in enhancing light-matter interactions as well as in reducing footprints of photonic devices especially in Terahertz (THz). Polaritons offer a promising platform for the manipulation of light at the deep sub-wavelength scale. However, traditional THz polariton materials lack active tuning and anisotropic propagation simultaneously. In this paper, we design a graphene/α-MoO3 heterostructure and simulate polariton hybridization between isotropic graphene plasmon polaritons and anisotropic α-MoO3 phonon polaritons. The physical fundamentals for polariton hybridizations depend on the evanescent fields coupling originating from the constituent materials as well as the phase match condition, which can be severely affected by the α-MoO3 thickness and actively tuned by the gate voltages. Hybrid polaritons propagate with in-plane anisotropy that exhibit momentum dispersion characterized by elliptical, hyperboloidal and even flattened iso-frequency contours (IFCs) in the THz range. Our results provide a tunable and flexible anisotropic polariton platform for THz sensing, imaging, and modulation. Full article
(This article belongs to the Special Issue Processing and Applications of Novel Optical Metamaterials)
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