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Nanomaterials
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Nanoscale Photonics and Metamaterials
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Nanoscale Photonics and Metamaterials

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

Deadline for manuscript submissions: closed (30 October 2024) | Viewed by 4473

Special Issue Editor

Dr. Pao Tai Lin

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA
Interests: mid-infrared integrated photonics; biomedical sensors-on-a-chip; multiscale fabrication technologies; reconfigurable materials; nanophotonics and metamaterials

Special Issue Information

Dear Colleagues,

Nanophotonics is an interdisciplinary subject that combines nanoscience and photonics and studies the interaction between light and matter at the nanoscale. Nanophotonics has become an active research field in recent years with growing interest in the exploration of new physics, materials, devices, and related technologies. Among them, metamaterials, as one of the subfields of nanophotonics, have been developing rapidly. The term "metamaterial" was first proposed by Professor Rodger M. Walser. Later, it is generally understood that "metamaterial" is an artificial material. Metamaterials can possess extraordinary physical properties that cannot be achieved with natural materials.

The development of metamaterials and nanophotonics may lead to technological evolution in many fields. The progress is currently in the brewing stage and it deserves close attention and expectation. This Special Issue presents the most recent development trend by collecting and sorting out the research of experts and scholars in this field. It is hoped that the collection can broaden the ideas of exploration for relevant researchers and pave the way for future research and communities.

Dr. Pao Tai Lin
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

  • nano-photonics
  • metamaterials
  • optical properties
  • surface plasmons
  • nano-optics
  • nano-fabrication
  • dielectric metasurfaces

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Published Papers (3 papers)

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Research

10 pages, 2327 KiB  
Article
Electric Field-Enhanced SERS Detection Using MoS2-Coated Patterned Si Substrate with Micro-Pyramid Pits
by Tsung-Shine Ko, Hsiang-Yu Hsieh, Chi Lee, Szu-Hung Chen, Wei-Chun Chen, Wei-Lin Wang, Yang-Wei Lin and Sean Wu
Nanomaterials 2024, 14(22), 1852; https://doi.org/10.3390/nano14221852 - 20 Nov 2024
Viewed by 245
Abstract
This study utilized semiconductor processing techniques to fabricate patterned silicon (Si) substrates with arrays of inverted pyramid-shaped micro-pits by etching. Molybdenum trioxide (MoO3) was then deposited on these patterned Si substrates using a thermal evaporation system, followed by two-stage sulfurization in [...] Read more.
This study utilized semiconductor processing techniques to fabricate patterned silicon (Si) substrates with arrays of inverted pyramid-shaped micro-pits by etching. Molybdenum trioxide (MoO3) was then deposited on these patterned Si substrates using a thermal evaporation system, followed by two-stage sulfurization in a high-temperature furnace to grow MoS2 thin films consisting of only a few atomic layers. During the dropwise titration of Rhodamine 6G (R6G) solution, a longitudinal electric field was applied using a Keithley 2400 (Cleveland, OH, USA) source meter. Raman mapping revealed that under a 100 mV condition, the analyte R6G molecules were effectively confined within the pits. Due to its two-dimensional structure, MoS2 provides a high surface area and supports a surface-enhanced Raman scattering (SERS) charge transfer mechanism. The SERS results demonstrated that the intensity in the pits of the few-layer MoS2/patterned Si SERS substrate was approximately 274 times greater compared to planar Si, with a limit of detection reaching 10−5 M. The experimental results confirm that this method effectively resolves the issue of random distribution of analyte molecules during droplet evaporation, thereby enhancing detection sensitivity and stability. Full article
(This article belongs to the Special Issue Nanoscale Photonics and Metamaterials)
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13 pages, 3457 KiB  
Article
The Ultra-Large-Bandwidth Cascade Full-Stokes-Imaging Metasurface Based on the Dual-Major-Axis Circular Dichroism Grating
by Bo Cheng and Guofeng Song
Nanomaterials 2023, 13(15), 2211; https://doi.org/10.3390/nano13152211 - 30 Jul 2023
Cited by 1 | Viewed by 1378
Abstract
A dual-major-axis grating composed of two metal–insulator–metal (MIM) waveguides with different dielectric layer thicknesses is numerically proposed to achieve the function of the quarter-wave plate with an extremely large bandwidth (1.0–2.2 μm), whose optical properties can be controlled by the Fabry–Pérot (FP) resonance. [...] Read more.
A dual-major-axis grating composed of two metal–insulator–metal (MIM) waveguides with different dielectric layer thicknesses is numerically proposed to achieve the function of the quarter-wave plate with an extremely large bandwidth (1.0–2.2 μm), whose optical properties can be controlled by the Fabry–Pérot (FP) resonance. For the TE incident mode wave, MIM waveguides with large (small) dielectric layer thicknesses control the guided-mode resonant channels of long (short) waves, respectively, in this miniaturized optical element. Meanwhile, for the TM incident mode wave, the propagation wave vector of this structure is controlled by the hybrid mode of two gap-SPPs (gap-surface plasmon polaritons) with different gap thicknesses. We combine this structure with a thick silver grating to propose a circularly polarizing dichroism device, whose effective bandwidth can reach an astonishing 1.65 μm with a circular polarization extinction ratio greater than 10 dB. The full Stokes pixel based on the six-image element technique can almost accurately measure arbitrary polarization states at 1.2–2.8 μm (including elliptically polarized light), which is the largest bandwidth (1600 nm) of the full Stokes large-image element to date in the near-infrared band. In addition, the average errors of the degree of linear polarizations (Dolp) and degree of circular polarizations (Docp) are less than −25 dB and −10 dB, respectively. Full article
(This article belongs to the Special Issue Nanoscale Photonics and Metamaterials)
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9 pages, 3015 KiB  
Article
Inverse Design and Numerical Investigations of an Ultra-Compact Integrated Optical Switch Based on Phase Change Material
by Kun Yin, Yang Gao, Hao Shi and Shiqiang Zhu
Nanomaterials 2023, 13(10), 1643; https://doi.org/10.3390/nano13101643 - 15 May 2023
Cited by 2 | Viewed by 2115
Abstract
The miniaturization of optical switches is a promising prospect with the use of phase-change materials (PCMs), and exploring various strategies to effectively integrate PCMs with integrated optical waveguides represents an intriguing research question. In this study, an ultra-compact integrated optical switch based on [...] Read more.
The miniaturization of optical switches is a promising prospect with the use of phase-change materials (PCMs), and exploring various strategies to effectively integrate PCMs with integrated optical waveguides represents an intriguing research question. In this study, an ultra-compact integrated optical switch based on PCM is proposed. This device consists of a Ge2Sb2Te5 nano-disk and an inverse-designed pixelated sub-wavelength structure. The pixelated sub-wavelength structure offers customized refractive indices that conventional materials or structures cannot achieve, leading to an improved insertion loss (IL) and extinction ratio (ER) performance of the device. Furthermore, this structure enhances the interaction between the optical field and GST, resulting in a reduction of the device size and the inserted GST footprint. With an ultra-compact device footprint of 0.9 µm × 1.5 µm, the simulation results exhibit a low IL of 0.45 dB, and a high ER of 18.0 dB at 1550 nm. Additionally, relevant studies show that this device is able to perform reliably despite minor variations in the manufacturing process. Full article
(This article belongs to the Special Issue Nanoscale Photonics and Metamaterials)
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