A frequency selective surface with nano square ring resonators for enhancing banknote security

Sripradit, Abhisit; Theeradejvanichkul, Thorin

doi:10.1109/apusncursinrsm.2017.8072381

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…First, the setup method must be able to model objects that are smaller than the minimum wavelength of VIS (<400 nm) to allow us to control the optical properties of nanoparticles, such as color. The finite element analysis (FEA) method is suitable for this study [44]. FEA is a well-known technique with high potential for analyzing complex nano-scale structures [45,46].…”

Section: The Domain Setupmentioning

confidence: 99%

A Self-Color-Changing Film with Periodic Nanostructure for Anti-Counterfeit Application

Sripradit

Theeradejvanichkul

2022

Applied Sciences

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A self-color-changing film aimed at enhanced security and anti-counterfeit packaging is presented. Its function is to change color automatically when flipped under visible light. It is low-cost, takes a few seconds to check by the naked eye, and does not need any special tools to evaluate. The design of the color-changing, anti-counterfeiting film is based on a frequency-selective surface (FSS). The film is designed with aluminum nanocubes. They are laid out as an array in a plane with equal distance from one another. This arrangement allows us to select certain wavelengths of light to pass through by the size of the cubes and the separation distance between them. The performance is evaluated by a finite element analysis (FEA) method. The results show that the intersection of transmittance and the reflectance curves cause the film to change its color automatically when flipped. We also propose a method to predict the color of the film based on the transmittance values. The accuracy of this method is verified by actual colors from experiments with an error of no more than 12.8%, analyzed by the CIE chromaticity diagram.

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Section: The Domain Setupmentioning

confidence: 99%

A Self-Color-Changing Film with Periodic Nanostructure for Anti-Counterfeit Application

Sripradit

Theeradejvanichkul

2022

Applied Sciences

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“…In this paper, we present a design of a greenhouse covering film based on a frequency selective surface (FSS) nanostructure [16]. The film contains aluminum fibers that are nanometer in size and structurally capable of filtering out UV and NIR.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Greenhouse FSS Nanofiber Film for Enhancing Agricultural Productivity by Selective Reduction of UV and NIR

Sripradit

Theeradejvanichkul

2022

Inventions

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A greenhouse covering film is an essential part of any greenhouse. Its function is to filter solar radiation in the ultraviolet (UV) and the near-infrared (NIR) bands while allowing a great amount of photosynthetically active radiation (PAR) to transmit. This paper proposes a design of the greenhouse covering film based on a frequency selective surface (FSS). Aluminum is made into fibers in the nanoscale. They are laid out in an array, in-plane at equidistance from one another. This arrangement induces the wavelength selectivity of light via adjustment to the fiber sizes and spacings. The performance is evaluated by a finite element analysis (FEA) method. The results show less than 26% transmittance of UV and NIR while allowing more than 94% transmittance in the PAR regime.

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A frequency selective surface with nano square ring resonators for enhancing banknote security

Cited by 2 publications

References 4 publications

A Self-Color-Changing Film with Periodic Nanostructure for Anti-Counterfeit Application

A Self-Color-Changing Film with Periodic Nanostructure for Anti-Counterfeit Application

Design and Simulation of a Greenhouse FSS Nanofiber Film for Enhancing Agricultural Productivity by Selective Reduction of UV and NIR

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