University of Oulu

Palvölgyi, P.S., Kokkonen, M., Sliz, R., Jantunen, H., Kordas, K. and Myllymäki, S. (2023), Porous Low-Loss Silica–PMMA Dielectric Nanocomposite for High-Frequency Bullet Lens Applications. Adv. Photonics Res., 4: 2200208.

Porous low-loss silica–PMMA dielectric nanocomposite for high-frequency bullet lens applications

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Author: Palvölgyi, Petra S.1; Kokkonen, Mikko1; Sliz, Rafal2;
Organizations: 1Microelectronics Research Unit, Faculty of Information and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90570 Oulu, Finland
2Optoelectronics and Measurement Techniques Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.7 MB)
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Language: English
Published: John Wiley & Sons, 2023
Publish Date: 2023-02-14


Several devices of the future generation wireless telecommunication technologies that use bands in THz frequencies for data transmission need low-loss and low-permittivity materials to enable ideal conditions for the propagation of electromagnetic waves. Herein, a lightweight dielectric bullet-shaped lens operating in the frequency range of 110–170 GHz is demonstrated to collimate electromagnetic waves, thus increasing the intensity of the electric field. The material of the lens is based on a composite of silica nanoshells and poly(methylmethacrylate) made by the impregnation of the nanoshells with the polymer followed by hot pressing in a mold. As the polymer acts only as an adhesive between the hollow nanospheres without filling the inner cavity of the shells and their interparticle spaces, the composite is highly porous (67%) and has low dielectric permittivity and loss tangent (1.5 and 4 × 10⁻³, respectively, below 200 GHz). The size of the collimated beam and the increase of the corresponding field strength are measured to vary from 2.2 to 1.2 mm and from 17.2 to 8.98 dB depending on the frequency of the waves (110–170 GHz).

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Series: Advanced photonics research
ISSN: 2699-9293
ISSN-E: 2699-9293
ISSN-L: 2699-9293
Volume: 4
Issue: 3
Article number: 2200208
DOI: 10.1002/adpr.202200208
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the 6G Flagship of the Academy of Finland under grant no. 318927.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
Copyright information: © 2023 The Authors. Advanced Photonics Research published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.