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Open AccessCommunication
Micromachines 2015, 6(10), 1421-1426; doi:10.3390/mi6101421

Frequency Selective Surfaces with Nanoparticles Unit Cell

1
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, China
2
State Key Laboratory for Millimeter Waves, City University of Hong Kong, Tat Chee Avenue,Kowloon Tong, Hong Kong, China
3
Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, China
This paper is an extended version of our paper published in the 10th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems (IEEE NEMS 2015), Xi’an, China, 7–11 April 2015.
*
Author to whom correspondence should be addressed.
Academic Editors: Wen Jung Li and Ting-Hsuan Chen
Received: 20 July 2015 / Revised: 3 September 2015 / Accepted: 14 September 2015 / Published: 25 September 2015

Abstract

The frequency selective surface (FSS) is a periodic structure with filtering performance for optical and microwave signals. The general periodic arrays made with patterned metallic elements can act as an aperture or patch on a substrate. In this work, two kinds of materials were used to produce unit cells with various patterns. Gold nanoparticles of 25 nm diameter were used to form periodic monolayer arrays by a confined photocatalytic oxidation-based surface modification method. As the other material, silver gel was used to create multiple layers of silver. Due to the ultra-thin nature of the self-assembled gold nanoparticle monolayer, it is very easy to penetrate the FSS with terahertz radiation. However, the isolated silver islands made from silver gel form thicker multiple layers and contribute to much higher reflectance. This work demonstrated that multiple silver layers are more suitable than gold nanoparticles for use in the fabrication of FSS structures.
Keywords: frequency selective surface (FSS); amine functionalization; time-domain spectroscopy (TDS) system frequency selective surface (FSS); amine functionalization; time-domain spectroscopy (TDS) system
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Poon, N.H.; Yan, Y.; Zhou, L.; Wang, D.; Chan, C.-H.; Roy, V.A.L. Frequency Selective Surfaces with Nanoparticles Unit Cell. Micromachines 2015, 6, 1421-1426.

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