Optical Micro–Nano Structures and Devices: Materials, Design and Applications

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

Deadline for manuscript submissions: 30 August 2024 | Viewed by 742

Special Issue Editors

School of Electronics and Information Technology (School of Microelectronics), Sun Yat-sen University, Guangzhou 510006, China
Interests: nanophotonics; infrared and terahertz optics; Van der Waals materials; scanning near-field optical microscopy
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Guest Editor
School of Electronics and Information Technology (School of Microelectronics), Sun Yat-sen University, Guangzhou 510006, China
Interests: polaritonics; nanophotonics; tehrahertz sciences and technologies; mid-infrared spectroscopy; two-dimensional materials and their optoelectronics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The terahertz band (0.1 THz–10 THz), scarcely exploited compared to other electromagnetic waves, has been receiving enourmous attention around the world. Photonic devices exploiting this frequecny band offer promise in a very diverse range of applications, such as biosensing, medical imaging, and 6G wireless communication technology, to name a few. This may be attributed to their large potential for molecular label-free fingerprinting,  as well as their non-ionizing properties and broad spectral bandwidth.

The realization of sensitive, high-speed and high-efficiency micro–nano devices for wireless communication, integrated circuits, and miniaturized interconnections requires materials and structure designs with strong light–matter interactions. However, approaches for generation, transmission, and conversion of terahertz electromagnetic waves are still limited. Therefore, novel materials and their micro–nano structures, exhibiting strong responses, extremely high electromagnetic confinement, and enhanced light–matter interactions, are in urgent demand.

This Special Issue aims to report on novel physical phenomena and machnisms in new emerging materials (metals, semiconductors, two-dimensional materials, topological materials, etc.) for emission, manipulation, and detection of terahertz electromagnetic waves, as well as the design and fabrication of micro–nano structures (cavity, metasurfaces, antenna, etc.) and devices for terahertz emission sources, modulators, and detector sand focal plane arrays for THz imaging.

Dr. Zebo Zheng
Prof. Dr. Huanjun Chen
Guest Editors

Manuscript Submission Information

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Keywords

  • nanomaterials with optical response
  • high power terahertz emission
  • broadband or narrowband terahertz source
  • far-field terahertz modulation
  • terahertz detection
  • polaritonics
  • micro-nano structure and devices for terahertz imaging
  • metasurfaces
  • terahertz sensing
  • optical micro-nano structures and devices.

Published Papers (1 paper)

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Research

12 pages, 4270 KiB  
Article
The Effect of Height Error on Performance of Propagation Phase-Based Metalens
by Yongxue Qiu, Liangui Deng, Yujie Zhan, Gongfa Li and Jianguo Guan
Micromachines 2024, 15(4), 540; https://doi.org/10.3390/mi15040540 - 17 Apr 2024
Viewed by 549
Abstract
Metalenses, as a new type of planar optical device with flexible design, play an important role in miniaturized and integrated optical devices. Propagation phase-based metalenses, known for their low loss and extensive design flexibility, are widely utilized in optical imaging and optical communication. [...] Read more.
Metalenses, as a new type of planar optical device with flexible design, play an important role in miniaturized and integrated optical devices. Propagation phase-based metalenses, known for their low loss and extensive design flexibility, are widely utilized in optical imaging and optical communication. However, fabrication errors introduced by thin-film deposition and etching processes inevitably result in variations in the height of the metalens structure, leading to the fabricated devices not performing as expected. Here, we introduce a reflective TiO2 metalens based on the propagation phase. Then, the relationship between the height variation and the performance of the metalens is explored by using the maximum phase error. Our results reveal that the height error of the unit structure affects the phase rather than the amplitude. The focusing efficiency of our metalens exhibits robustness to structural variations, with only a 5% decrease in focusing efficiency when the height varies within ±8% of the range. The contents discussed in this paper provide theoretical guidance for the unit design of the propagation phase-based metalens and the determination of its allowable fabrication error range, which is of great significance for low-cost and high-efficiency manufacturing. Full article
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