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Special Issue "Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends"

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

Deadline for manuscript submissions: 20 September 2023 | Viewed by 3500

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Special Issue Editor

Prof. Dr. Hai-Zhi Song

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Guest Editor

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China
Interests: optoelectronics; integrated photonics; nano-materials; quantum information; micro-/nano-processing

Special Issue Information

Dear Colleagues,

Nano-optics and nano-optoelectronics currently represent one of the most active scientific and technological frontiers. By combining the achievements of photonics and nano-technology to realize thoroughly novel optical, electronic and optoelectronic functions, nano-optics and nano-optoelectronics have become indispensable in science and technology. After tremendous endeavors, nano-optics and nano-optoelectronics have already departed from their infancy and stepped into an exciting era, where research ideas and theoretical concepts are being vigorously transferred into functional devices and real-life applications. A great deal of work on nano-optics and nano-optoelectronics has been done thus far, and the achievements exhibit great application prospects in optical communication, optical interconnection, optical memory, sensing and imaging, metrology, display and lighting, medicine, security, green energy, etc. The research in this field is becoming increasingly wide-spread.

In order to review the present achievements and to promote the future developments of nano-optics and nano-optoelectronics, Nanomaterials is publishing this Special Issue, “Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends”. It will collect reviews, state-of-the-art works, newest research progresses on as well as the fundamental physics and practical technology in the fields of nano-optics and nano-optoelectronics. Topics include, but are not limited to, nano-optics and photonics, silicon photonics, integrated photonics, nano-optoelectronics, optoelectronic integration, flat optics, photonic and plasmonic nanomaterials, metamaterials and metasurfaces, strong light-matter interactions at the nanoscale, nano-antennas, nano-waveguide chips, nano-optomechanics, nano-lasers, nano-optoelectronic detectors, quantum nano-optics, nonlinear and ultrafast nano-optics, topological photonics, and non-reciprocal nano-optics.

We are expecting for your excellent papers, and we believe that your contribution will help to accelerate the advancement of nano-optics and nano-optoelectronics.

Prof. Dr. Hai-Zhi Song
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.

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Keywords

nano-optics

integrated photonics

nano-optoelectronics

flat optics

nano-waveguide chips

optoelectronic integration

metamaterials and metasurfaces

quantum nano-optics

topological photonics

nano-optomechanics

Published Papers (5 papers)

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Research

Open AccessArticle

Post-Processing Trimming of Silicon Photonic Devices Using Femtosecond Laser

and

Nanomaterials 2023, 13(6), 1031; https://doi.org/10.3390/nano13061031 - 13 Mar 2023

Viewed by 432

Abstract

Fabrication errors inevitably occur in device manufacturing owing to the limited processing accuracy of commercial silicon photonic processes. For silicon photonic devices, which are mostly processing-sensitive, their performances usually deteriorate significantly. This remains an unsolved issue for mass production, particularly for passive devices, because they cannot be adjusted once fixed in processes. This study presents a post-processing trimming method to compensate for fabrication errors by changing the cladding equivalent refractive indices of devices with femtosecond lasers. The experimental results show that the resonant wavelengths of micro-ring resonators can be regularly shifted within their free spectral range via tuning the illuminating area, focusing position, emitting power, and scanning speed of the trimming femtosecond laser with an acceptable loss increase. These experiments, as well as the trimming experiments in improving the phase balance of Mach-Zehnder interferometer switches, indicate that the femtosecond laser trimming method is an effective and fast method for silicon photonic devices. Full article

(This article belongs to the Special Issue Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends)

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Open AccessCommunication

Optically Controlling Broadband Terahertz Modulator Based on Layer-Dependent PtSe₂ Nanofilms

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Nanomaterials 2023, 13(5), 795; https://doi.org/10.3390/nano13050795 - 21 Feb 2023

Viewed by 421

Abstract

In this paper, we propose an optically controlling broadband terahertz modulator of a layer-dependent PtSe₂ nanofilm based on a high-resistance silicon substrate. Through optical pump and terahertz probe system, the results show that compared with 6-, 10-, and 20-layer films, a 3-layer PtSe₂ nanofilm has better surface photoconductivity in the terahertz band and has a higher plasma frequency ω_p of 0.23 THz and a lower scattering time τ_s of 70 fs by Drude–Smith fitting. By the terahertz time-domain spectroscopy system, the broadband amplitude modulation of a 3-layer PtSe₂ film in the range of 0.1–1.6 THz was obtained, and the modulation depth reached 50.9% at a pump density of 2.5 W/cm². This work proves that PtSe₂ nanofilm devices are suitable for terahertz modulators. Full article

(This article belongs to the Special Issue Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends)

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Open AccessEditor’s ChoiceArticle

Silver Nanoparticle Chains for Ultra-Long-Range Plasmonic Waveguides for Nd³⁺ Fluorescence

Javier Fernández-Martínez

Sol Carretero-Palacios

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Nanomaterials 2022, 12(23), 4296; https://doi.org/10.3390/nano12234296 - 03 Dec 2022

Viewed by 636

Abstract

Plasmonic waveguides have been shown to be a promising approach to confine and transport electromagnetic energy beyond the diffraction limit. However, ohmic losses generally prevent their integration at micrometric or millimetric scales. Here, we present a gain-compensated plasmonic waveguide based on the integration of linear chains of Ag nanoparticles on an optically active Nd³⁺-doped solid-state gain medium. By means of dual confocal fluorescence microscopy, we demonstrate long-range optical energy propagation due to the near-field coupling between the plasmonic nanostructures and the Nd³⁺ ions. The subwavelength fluorescence guiding is monitored at distances of around 100 µm from the excitation source for two different emission ranges centered at around 900 nm and 1080 nm. In both cases, the guided fluorescence exhibits a strong polarization dependence, consistent with the polarization behavior of the plasmon resonance supported by the chain. The experimental results are interpreted through numerical simulations in quasi-infinite long chains, which corroborate the propagation features of the Ag nanoparticle chains at both excitation (λ_exc = 590 nm) and emission wavelengths. The obtained results exceed by an order of magnitude that of previous reports on electromagnetic energy transport using linear plasmonic chains. The work points out the potential of combining Ag nanoparticle chains with a small interparticle distance (~2 nm) with rare-earth-based optical gain media as ultra-long-range waveguides with extreme light confinement. The results offer new perspectives for the design of integrated hybrid plasmonic–photonic circuits based on rare-earth-activated solid-state platforms. Full article

(This article belongs to the Special Issue Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends)

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Open AccessArticle

Generation of Subdiffraction Optical Needles by Simultaneously Generating and Focusing Azimuthally Polarized Vortex Beams through Pancharatnam–Berry Metalenses

Zhe Shen

and

Shijie Huang

Nanomaterials 2022, 12(22), 4074; https://doi.org/10.3390/nano12224074 - 19 Nov 2022

Viewed by 474

Abstract

Needle beams have received widespread attention due to their unique characteristics of high intensity, small focal size, and extended depth of focus (DOF). Here, a single–layer all–dielectric metalens based on Pancharatnam–Berry (PB) was used to efficiently generate and focus an azimuthally polarized vortex beam at the same time. Then, additional phase or amplitude modulation was respectively adopted to work with the metalens to produce optical needles. By decorating the PB metalens with the binary optical element (BOE), an optical needle with full–width–at–half–maximum (FWHM) of 0.47 λ and DOF of 3.42 λ could be obtained. By decorating the PB metalens with an annular aperture, an optical needle with long DOF (16.4 λ) and subdiffraction size (0.46 λ) could be obtained. It is expected that our work has potential applications in super–resolution imaging, photolithography, and particle trapping. Full article

(This article belongs to the Special Issue Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends)

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Open AccessArticle

Electro-Optical Modulation in High Q Metasurface Enhanced with Liquid Crystal Integration

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Nanomaterials 2022, 12(18), 3179; https://doi.org/10.3390/nano12183179 - 13 Sep 2022

Viewed by 890

Abstract

Electro-optical tuning metasurfaces are particularly attractive since they open up routes for dynamic reconfiguration. The electro-optic (EO) modulation strength essentially depends on the sensitivity to the EO-induced refractive index changes. In this paper, lithium niobate (LiNbO₃) metasurfaces integrated with liquid crystals (LCs) are theoretically investigated. Cylinder arrays are proposed to support quasi-bound states in the continuum (quasi-BICs). The quasi-BIC resonances can significantly enhance the lifetime of photons and the local field, contributing to the EO-refractive index changes. By integrating metasurfaces with LCs, the combined influence of the LC reorientation and the Pockels electro-optic effect of LiNbO₃ is leveraged to tune the transmitted wavelength and phase spectrum around the quasi-BIC wavelength, resulting in an outstanding tuning sensitivity up to Δλ/ΔV ≈ 0.6 nm/V and relieving the need of high voltage. Furthermore, the proposed structure can alleviate the negative influence of sidewall tilt on device performance. The results presented in this work can foster wide application and prospects for the implementation of tunable displays, light detection and ranging (LiDAR), and spatial light modulators (SLMs). Full article

(This article belongs to the Special Issue Nano-Optics and Nano-Optoelectronics: Challenges and Future Trends)

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