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Optical Nanoantennas
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Optical Nanoantennas

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (30 April 2019) | Viewed by 21583

Special Issue Editor

Prof. Dr. Andrey Miroshnichenko

grade E-Mail Website
Guest Editor
School of Engineering and Information Technology, University of New South Wales Canberra, Northcott Drive, Campbell, ACT 2600, Australia
Interests: nanophotoncis; nonlinear optics; optoelectronics; light-matter interaction; fano resonances
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Antennas are important elements of wireless information communication technologies, along with sources of electromagnetic radiation and their detectors. They are at the heart of modern radio and microwave frequency communications technologies and refer to devices converting electricomagnetic currents into propagating waves and vice versa. Recently, the concept of antennas has been extended to the optical domain resulting in development of optical nanoantennas, which transmit and receive optical signals based on nanoscale objects. The ultimate goal is to achieve high efficiency in detection and directivity of the transmitting signals for all-optical.

The functionality of a nanoantenna is two-fold: i) to transform the near-field of a quantum emitter into freely propagating optical radiation, and ii) convert the incident radiation into a strongly confined near-field.

This Special Issue focuses on the latest research and development of optical nanoantennas and their applications, including linear, nonlinear, chiral, plasmonic, all-dielectric, and strong-coupled structures.

Prof. Dr. Andrey Miroshnichenko
Guest Editor

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Keywords

  • Optical nanoantennas
  • Linear and nonlinear nanoantennas
  • All-dielectric nanoparticles
  • Chiral nanoantennas
  • Strong coupling

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Published Papers (6 papers)

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Research

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7 pages, 34226 KiB  
Article
Broadband Holography via Structured Black Silicon Nano-Antennas
by Mohammed Sait, Valerio Mazzone and Andrea Fratalocchi
Appl. Sci. 2019, 9(7), 1378; https://doi.org/10.3390/app9071378 - 1 Apr 2019
Cited by 4 | Viewed by 3187
Abstract
Computer-generated holograms have wide applications in different fields of optics, ranging from imaging, data storage, to security.Herein, we report a new method for the fabrication of large-scale computer-generated holograms from an inexpensive material, such as Silicon. Our approach exploits dry etching to create [...] Read more.
Computer-generated holograms have wide applications in different fields of optics, ranging from imaging, data storage, to security.Herein, we report a new method for the fabrication of large-scale computer-generated holograms from an inexpensive material, such as Silicon. Our approach exploits dry etching to create a series of broadband nanoantennas, which can tune the reflectivity of Si from an average of 0.35 to 0.1 in the entire visible range. We demonstrated the realisation of different images at wavelengths of 450 nm, 532 nm, and 632 nm with an efficiency of 10%, 14%, and 12%, respectively, thus opening up the application of large-scale broadband computer-generated holographic surfaces. Full article
(This article belongs to the Special Issue Optical Nanoantennas)
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12 pages, 5395 KiB  
Article
Tests of Cryogenic Fabry–Perot Cavity with Mirrors on Different Substrates
by Mickail V. Kuvshinskii, Sergei I. Oreshkin, Sergei M. Popov, Valentin N. Rudenko, Ivan S. Yudin, Valentina V. Azarova and Sergei V. Blagov
Appl. Sci. 2019, 9(2), 230; https://doi.org/10.3390/app9020230 - 10 Jan 2019
Cited by 3 | Viewed by 3076
Abstract
Experiments were performed with Fabry–Perot optical resonators in vacuum at low temperatures. Mirrors were applied on substrates of various optical materials. An infrared laser with a wavelength of 1.064 microns was used. The pump power at the maximum could reach 450 mW. The [...] Read more.
Experiments were performed with Fabry–Perot optical resonators in vacuum at low temperatures. Mirrors were applied on substrates of various optical materials. An infrared laser with a wavelength of 1.064 microns was used. The pump power at the maximum could reach 450 mW. The evolution of the optical properties of the FP cavity was traced in the temperature range 300–10 K. The main parameters measured were the integral characteristics of the FP resonances–sharpness (finesse) and contrast of interference. Three types of substrates were tested: a sitall, an optical glass with ultra low thermal expansion (ULE); sapphire; and calcium fluoride. During cooling, the degradation of the integral characteristics of the FP cavity was observed for the sitall mirrors due to the loss of the properties of ULE, and for sapphire mirrors due to the birefringence effect. The satisfactory constancy of the integral characteristics of the FP resonator on calcium fluoride was demonstrated in the entire temperature range studied. Full article
(This article belongs to the Special Issue Optical Nanoantennas)
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10 pages, 2141 KiB  
Article
Boosting Second Harmonic Radiation from AlGaAs Nanoantennas with Epsilon-Near-Zero Materials
by Davide Rocco, Maria Antonietta Vincenti and Costantino De Angelis
Appl. Sci. 2018, 8(11), 2212; https://doi.org/10.3390/app8112212 - 10 Nov 2018
Cited by 21 | Viewed by 3576
Abstract
Enhancing the second harmonic conversion efficiency at the nanoscale is a critical challenge in nonlinear optics. Here we propose the use of epsilon-near-zero materials to boost the nonlinear radiation in the far field. Here, a comparison of the second harmonic behavior of a [...] Read more.
Enhancing the second harmonic conversion efficiency at the nanoscale is a critical challenge in nonlinear optics. Here we propose the use of epsilon-near-zero materials to boost the nonlinear radiation in the far field. Here, a comparison of the second harmonic behavior of a cylindrical AlGaAs nanoantenna placed over different semi-infinite layers is presented. In particular, we observed that the second harmonic generation is strongly enhanced and redirected by the simultaneous presence of a resonance at the fundamental wavelength and a low-permittivity condition in the substrate at the harmonic wavelength. Our results pave the way for a novel approach to enhance optical nonlinearities at the nanoscale. Full article
(This article belongs to the Special Issue Optical Nanoantennas)
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12 pages, 4693 KiB  
Article
The Quest for Low Loss High Refractive Index Dielectric Materials for UV Photonic Applications
by Yael Gutiérrez, Dolores Ortiz, José M. Saiz, Francisco González, Pablo Albella and Fernando Moreno
Appl. Sci. 2018, 8(11), 2065; https://doi.org/10.3390/app8112065 - 25 Oct 2018
Cited by 8 | Viewed by 3414
Abstract
Nanostructured High Refractive Index (HRI) dielectric materials, when acting as nanoantennas or metasurfaces in the near-infrared (NIR) and visible (VIS) spectral ranges, can interact with light and show interesting scattering directionality properties. Also, HRI dielectric materials with low absorption in these spectral ranges [...] Read more.
Nanostructured High Refractive Index (HRI) dielectric materials, when acting as nanoantennas or metasurfaces in the near-infrared (NIR) and visible (VIS) spectral ranges, can interact with light and show interesting scattering directionality properties. Also, HRI dielectric materials with low absorption in these spectral ranges show very low heat radiation when illuminated. Up to now, most of the studies of these kind of materials have been explored in the VIS-NIR. However, to the best of our knowledge, these properties have not been extended to the ultraviolet (UV), where their application in fields like photocatalysis, biosensing, surface-enhanced spectroscopies or light guiding and trapping can be of extraordinary relevance. Here, we present a detailed numerical study of the directional scattering properties, near-field enhancement and heat generation of several materials that can be good candidates for those applications in the UV. These materials include aluminum phosphide, aluminum arsenide, aluminum nitride, diamond, cerium dioxide and titanium dioxide. In this study, we compare their performance when forming either isolated nanoparticles or dimers to build either nanoantennas or unit cells for more complex metasurfaces. Full article
(This article belongs to the Special Issue Optical Nanoantennas)
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12 pages, 6688 KiB  
Article
Combined Mie Resonance Metasurface for Wideband Terahertz Absorber
by Jie Hu, Tingting Lang, Changyu Shen and Liyang Shao
Appl. Sci. 2018, 8(9), 1679; https://doi.org/10.3390/app8091679 - 17 Sep 2018
Cited by 9 | Viewed by 5343
Abstract
In this paper, we propose a combined metasurface consisting of an aluminum substrate and an array of TiO2 blocks to achieve a wideband terahertz absorber. We incorporated several similar dielectric blocks with different side length into each unit cell. Each dielectric block [...] Read more.
In this paper, we propose a combined metasurface consisting of an aluminum substrate and an array of TiO2 blocks to achieve a wideband terahertz absorber. We incorporated several similar dielectric blocks with different side length into each unit cell. Each dielectric block could cause magnetic-resonance-inducing absorption effect with different peak wavelengths. Thus, our combined metasurface could achieve wider absorption frequency band than the traditional design when these dielectric blocks were properly designed. The absorption bandwidth could be widened nearly 2.5 times and 5 times compared to a single block case when there were four and nine blocks, respectively, andcouldbe further improved by increasing the number of combinations in structures (variable parameters included number, spacing, dimensions etc.). For both TE00 (the electric fields of the light polarized along the y-axis) and TM00 (the electric fields of the light polarized along the x-axis) polarization states, the absorption bandwidth could be widened effectively; even when the incident angle was 45°, the absorption rate could still reach about 75%. This structure is simple and easy to fabricate, and this design concept can also be used in various other application fields. Full article
(This article belongs to the Special Issue Optical Nanoantennas)
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3 pages, 155 KiB  
Viewpoint
The Invention of an Optical Antenna—A Personal Reminiscence
by Wolfgang Dieter Pohl
Appl. Sci. 2018, 8(12), 2354; https://doi.org/10.3390/app8122354 - 22 Nov 2018
Viewed by 2245
Abstract
The subject of this article is my personal path from the near-field optical (NFO) microscope to the optical antenna and its potential for modern optics. Full article
(This article belongs to the Special Issue Optical Nanoantennas)
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