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Crystals
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Plasmonic Nanostructures
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Plasmonic Nanostructures

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 20727

Special Issue Editors

Prof. Dr. Ngoc Diep Lai

E-Mail Website
Guest Editor
Laboratoire Lumière, Matière et Interfaces, Ecole Normale Supérieure Paris-Saclay, University of Paris-Saclay, 91190 Saint-Aubin, France
Interests: nanophotonics; photonic crystals; plasmonics, single photon source; nonlinear optics
Prof. Dr. Tho Duc Nguyen

E-Mail Website
Guest Editor
University of Georgia, Athens, GA 30602-2451, USA
Interests: photonic crystals; plasmonics; magnetoplasmonics; light-emitting diodes and solar cells; spintronics

Special Issue Information

Dear Colleagues,

Surface plasmon resonance has attracted more and more attention thanks to its wide range of applications in numerous fields (physics, chemistry, biology, etc.). In plasmonic lattices, light can be coupled and amplified resonantly in an aligned array of plasmonic nanostructures (PNs). In such a system, the surface plasmon polaritons can propagate throughout the PN surface thanks to the coupling of multiple nanoholes or nanoparticles. The properties of plasmon resonance of PNs can be tuned by characteristic length scales and types of arrays such as periodic, quasiperiodic, and aperiodic structures. Such PNs have great promise for many interesting applications, such as tunable filter and nanoscaled color printing, plasmonics-based data storage, plasmonic laser, magnetoplasmonic sensors, etc.

This Special Issue focuses on the latest advances in the field of plasmonic nanostructures. It deals with different aspects, from theoretical calculation and experimental fabrication to applications demonstration of plasmonic nanostructures.

This Special Issue will focus mainly, but not exclusively, on the following:

(1) new fabrication techniques for the synthesis and/or functionalization of plasmonic nanostructures;

(2) a deeper understanding of linear and nonlinear optical properties of plasmonic nanostructures;

(3) demonstration of plasmo-optical properties of plasmonic nanostructures;

(4) functionalization strategies to engineer the plasmonic nanostructures surfaces;

(5) demonstration of new applications of plasmonic nanostructures, such as tunable filter, color printer, data storage, plasmonic laser, magnetoplasmonic sensors, etc.

Prof. Dr. Ngoc Diep Lai
Prof. Dr. Tho Duc Nguyen
Guest Editors

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. Crystals 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 2100 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

  • Plasmonics
  • Nonlinear optics
  • Sensor
  • Laser
  • Microfabrication
  • Magnetoplasmonics

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Published Papers (6 papers)

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Research

12 pages, 3991 KiB  
Article
Efficient Broadband Truncated-Pyramid-Based Metamaterial Absorber in the Visible and Near-Infrared Regions
by Phuc Toan Dang, Tuan V. Vu, Jongyoon Kim, Jimin Park, Van-Chuc Nguyen, Dat D. Vo, Truong Khang Nguyen, Khai Q. Le and Ji-Hoon Lee
Crystals 2020, 10(9), 784; https://doi.org/10.3390/cryst10090784 - 3 Sep 2020
Cited by 24 | Viewed by 4189
Abstract
We present a design of an ultra-broadband metamaterial absorber in the visible and near- infrared regions. The unit cell structure consists of a single layer of metallic truncated-pyramid resonator-dielectric-metal configuration, which results in a high absorption over a broad wavelength range. The absorber [...] Read more.
We present a design of an ultra-broadband metamaterial absorber in the visible and near- infrared regions. The unit cell structure consists of a single layer of metallic truncated-pyramid resonator-dielectric-metal configuration, which results in a high absorption over a broad wavelength range. The absorber exhibits 98% absorption at normal incidence spanning a wideband range of 417–1091 nm, with >99% absorption within 822–1054 nm. The broadband absorption stability maintains 95% at large incident angles up to 40° for the transverse electric (TE)-mode and 20° for the transverse magnetic (TM)-mode. Furthermore, the polarization-insensitive broadband absorption is presented in this paper by analyzing absorption performance with various polarization angles. The proposed absorber can be applied for applications such as solar cells, infrared detection, and communication systems thanks to the convenient and compatible bandwidth for electronic THz sources. Full article
(This article belongs to the Special Issue Plasmonic Nanostructures)
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10 pages, 2993 KiB  
Article
Carbon Nanotube Detectors and Spectrometers for the Terahertz Range
by Junsung Park, Xueqing Liu, Trond Ytterdal and Michael Shur
Crystals 2020, 10(7), 601; https://doi.org/10.3390/cryst10070601 - 10 Jul 2020
Cited by 4 | Viewed by 2948
Abstract
We present the compact unified charge control model (UCCM) for carbon nanotube field-effect transistors (CNTFETs) to enable the accurate simulation of the DC characteristics and plasmonic terahertz (THz) response in the CNTFETs. Accounting for the ambipolar nature of the carrier transport (n-type and [...] Read more.
We present the compact unified charge control model (UCCM) for carbon nanotube field-effect transistors (CNTFETs) to enable the accurate simulation of the DC characteristics and plasmonic terahertz (THz) response in the CNTFETs. Accounting for the ambipolar nature of the carrier transport (n-type and p-type conductivity at positive and negative gate biases, respectively), we use n-type and p-type CNTFET non-linear equivalent circuits connected in parallel, representing the ambipolar conduction in the CNTFETs. This allows us to present a realistic non-linear model that is valid across the entire voltage range and is therefore suitable for the CNTFET design. The important feature of the model is that explicit equations for gate bias, current, mobility, and capacitance with smoothing parameters accurately describe the device operation near the transition from above- to below-threshold regimes, with scalability in device geometry. The DC performance in the proposed compact CNTFET model is validated by the comparison between the SPICE simulation and the experimental DC characteristics. The simulated THz response resulted from the validated CNTFET model is found to be in good agreement with the analytically calculated response and also reveals the bias and power dependent sub-THz response and relatively wide dynamic range for detection that could be suitable for THz detectors. The operation of CNTFET spectrometers in the THz frequency range is further demonstrated using the present model. The simulation exhibits that the CNT-based spectrometers can cover a broad THz frequency band from 0.1 to 3.08 THz. The model that has been incorporated into the circuit simulators enables the accurate assessment of DC performance and THz operation. Therefore, it can be used for the design and performance estimation of the CNTFETs and their integrated circuits operating in the THz regime. Full article
(This article belongs to the Special Issue Plasmonic Nanostructures)
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11 pages, 2159 KiB  
Article
Efficient Design Method for Plasmonic Filter for Tuning Spectral Selectivity
by Yun Seon Do
Crystals 2020, 10(6), 531; https://doi.org/10.3390/cryst10060531 - 23 Jun 2020
Cited by 2 | Viewed by 2549
Abstract
Nano-structure-based color technologies have been reported as alternatives for conventional pigment- or dye-based color filters due to their simple design methods and durable characteristics. Since structure-based optical resonances accompany multiple resonance modes, spectral selectivity could be degraded. In this work, a simple and [...] Read more.
Nano-structure-based color technologies have been reported as alternatives for conventional pigment- or dye-based color filters due to their simple design methods and durable characteristics. Since structure-based optical resonances accompany multiple resonance modes, spectral selectivity could be degraded. In this work, a simple and effective design of a plasmonic color filter that combines the plasmonic filter with one-dimensional photonic crystals. The introduced photonic crystal provides a photonic band gap, and it helps in suppressing the undesirable transmission peaks of the plasmonic color filter that originates from higher order resonance modes. Finally, the proposed design achieves high color purity. In addition, the simplicity of the design makes it both suitable for large-area fabrication and cost effective. This work is expected to provide a practical alternative to traditional color filters. Full article
(This article belongs to the Special Issue Plasmonic Nanostructures)
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15 pages, 4837 KiB  
Article
Broadband Plasmonic Nanopolarizer Based on Different Surface Plasmon Resonance Modes in a Silver Nanorod
by Junxi Zhang, Lei Hu, Zhijia Hu, Yongqing Wei, Wei Zhang and Lide Zhang
Crystals 2020, 10(6), 447; https://doi.org/10.3390/cryst10060447 - 31 May 2020
Cited by 2 | Viewed by 2842
Abstract
Conventional polarizers including sheet, wire-grid, prism, and Brewster-angle type polarizers are not easily integrated with photonic circuits. Polarizing elements on the nanoscale are indispensable for integrated all-optical nanophotonic devices. Here, we propose a plasmonic nanopolarizer based on a silver nanorod. The polarization characteristics [...] Read more.
Conventional polarizers including sheet, wire-grid, prism, and Brewster-angle type polarizers are not easily integrated with photonic circuits. Polarizing elements on the nanoscale are indispensable for integrated all-optical nanophotonic devices. Here, we propose a plasmonic nanopolarizer based on a silver nanorod. The polarization characteristics result from the excitation of different resonance modes of localized surface plasmons (LSPs) at different wavelengths. Furthermore, the polarization characteristics in near field regions have been demonstrated by the electric field distribution of the nanorod based on finite-difference time-domain (FDTD) simulation, indicating a strong local resonant cavity with a standing wave mode for transverse electric (TE) polarization and weak electric fields distributed for transverse magnetic (TM) polarization. The nanopolarizer can efficiently work in the near field region, exhibiting a nanopolarization effect. In addition, very high extinction ratios and extremely low insertion losses can be achieved. Particularly, the nanopolarizer can work in a broadband from visible to near-infrared wavelengths, which can be tuned by changing the aspect ratio of the nanorod. The plasmonic nanopolarizer is a promising candidate for potential applications in the integration of nanophotonic devices and circuits. Full article
(This article belongs to the Special Issue Plasmonic Nanostructures)
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8 pages, 3611 KiB  
Article
Electromechanically Rotatable Cross-Shaped Mid-IR Metamaterial
by Jitong Zhong and Yu-Sheng Lin
Crystals 2020, 10(6), 431; https://doi.org/10.3390/cryst10060431 - 28 May 2020
Cited by 11 | Viewed by 2597
Abstract
We present an electromechanically rotatable infrared (IR) cross-shaped metamaterial (CSM) in the mid-IR wavelength range. The CSM configuration is composed of double gold layers with cross-shaped nanostructures. To investigate the fano-resonance within CSM nanostructures, the aspect ratios and length ratios of CSM are [...] Read more.
We present an electromechanically rotatable infrared (IR) cross-shaped metamaterial (CSM) in the mid-IR wavelength range. The CSM configuration is composed of double gold layers with cross-shaped nanostructures. To investigate the fano-resonance within CSM nanostructures, the aspect ratios and length ratios of CSM are compared and discussed. The electromagnetic responses exhibit the characteristics of large tuning range, tunable broad and narrow bandwidths. By properly tailoring the aspect ratio of CSM, the resonance can be tuned with bidirectional tuning in the range of 650 nm. CSM with different length ratios exhibit narrowband resonances around the wavelength of 4.6 μm and broadband resonances in the wavelength range of 5.0 μm to 6.5 μm. These characteristics of CSM with different aspect ratios and length ratios could be potentially used in IR narrowband and broadband filter. To further increase the flexibility of proposed electromechanically rotatable CSM, an actively tunable narrowband and broadband filter in the mid-IR wavelength range is performed. This study provides a unique approach to realizing an IR filter, with high flexibility. Full article
(This article belongs to the Special Issue Plasmonic Nanostructures)
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9 pages, 834 KiB  
Article
Deep Learning for the Inverse Design of Mid-Infrared Graphene Plasmons
by Anh D. Phan, Cuong V. Nguyen, Pham T. Linh, Tran V. Huynh, Vu D. Lam, Anh-Tuan Le and Katsunori Wakabayashi
Crystals 2020, 10(2), 125; https://doi.org/10.3390/cryst10020125 - 19 Feb 2020
Cited by 12 | Viewed by 4927
Abstract
We theoretically investigate the plasmonic properties of mid-infrared graphene-based metamaterials and apply deep learning of a neural network for the inverse design. These artificial structures have square periodic arrays of graphene plasmonic resonators deposited on dielectric thin films. Optical spectra vary significantly with [...] Read more.
We theoretically investigate the plasmonic properties of mid-infrared graphene-based metamaterials and apply deep learning of a neural network for the inverse design. These artificial structures have square periodic arrays of graphene plasmonic resonators deposited on dielectric thin films. Optical spectra vary significantly with changes in structural parameters. To validate our theoretical approach, we carry out finite difference time domain simulations and compare computational results with theoretical calculations. Quantitatively good agreements among theoretical predictions, simulations, and previous experiments allow us to employ this proposed theoretical model to generate reliable data for training and testing deep neural networks. By merging the pre-trained neural network with the inverse network, we implement calculations for inverse design of the graphene-based metameterials. We also discuss the limitation of the data-driven approach. Full article
(This article belongs to the Special Issue Plasmonic Nanostructures)
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