Plasmonic Security Component Angle-Dependent Color Verification
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Solution Overview
Problem
Existing optical security components for document authentication, particularly those with plasmonic effects, are difficult for inexperienced users to authenticate in transmission mode due to their complexity and lack of intuitive visual cues.
Innovation Solution
A plasmonic security component comprising two layers of transparent dielectric material with a metal layer in between, featuring structured undulations that couple surface plasmon modes with incident light, allowing for easy and reliable authentication through color variation with angle of observation, and potentially including complementary patterns for enhanced visual contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plasmonic effect optical components are used for transmission authentication, then authentication reliability is improved, but ease of operation deteriorates due to difficulty in visual verification
Solution Approach 1:
The patent applies color changes by designing the optical component to exhibit angle-dependent color variation in transmission mode. The plasmonic structure causes different wavelengths of light to be transmitted at different angles, creating visible color changes that are easy for users to observe and verify, thus improving ease of operation while maintaining authentication reliability
Solution Approach 2:
The patent implements dynamics by making the optical properties of the component dynamic rather than static. The transmission characteristics change dynamically with the angle of observation, allowing users to verify authenticity by simply changing their viewing angle and observing color variations, making authentication both reliable and user-friendly
2Reliability
If complex plasmonic structures are used, then authentication security is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the geometric parameters of the plasmonic structure, such as the period, depth, and shape of surface undulations. By optimizing these parameters, the invention achieves strong angle-dependent color variation effects that provide high authentication security while keeping the structural design relatively simple and manufacturable
3Ease of operation
If angle-dependent color variation is implemented, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial or excessive action by designing undulation structures with sufficient depth and pronounced geometric features. This ensures that the angle-dependent color variation effect is strong and easily observable even with moderate manufacturing tolerances, reducing the stringency of precision requirements while maintaining user-friendly authentication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The component provides a secure and user-friendly authentication method by enabling easy visual verification of authenticity through angle-dependent color changes, offering high reliability and resistance to counterfeiting.
Implementation Method 1
structured to form, on at least a portion of its surface, undulations capable of coupling surface plasmon modes supported by said dielectric-metal interfaces with an incident light wave
Implementation Method 2
a plasmonic effect optical security component, which can be controlled in transmission with the naked eye with great ease and security
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
According to one aspect, the invention relates to an optical safety component having a plasmonic effect intended to be observed by transmission, including two layers (101, 103) made of a transparent dielectric material, a metal layer (102) that is arranged between said layers made of dielectric material to form two dielectric-metal interfaces (105, 106), and is structured to form on at least a portion thereof corrugations (104) that are capable of coupling surface plasmon modes supported by said dielectric-metal interfaces with an incident light wave. The corrugations are arranged in a first coupling area in a first main direction and in at least one second coupling area separate from said first coupling area, in a second main direction that is substantially perpendicular to said first main direction, said metal layer being continuous on each one of said coupling areas.