Terahertz Resonator Structure for Tilt-Stable Authentication

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional forgery prevention structures using split ring resonators (SRRs) face challenges in achieving high-accuracy authentication when the medium is tilted, as the transmissivity of terahertz electromagnetic waves changes significantly with orientation, leading to unreliable authentication due to varying transmissivity ranges across different regions.

Innovation Solution

A forgery prevention structure is developed by combining anisotropic and isotropic resonators, with specific arrangements and patterns to stabilize transmissivity when tilted, using a mix of resonators that resonate with terahertz waves at different polarization directions and frequencies, including a hologram layer for enhanced security.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conductive layer with SRRs having open parts in a specific direction is used to achieve frequency-selective transmissivity, then the transmissivity changes significantly when the medium is tilted, but this enables forgery prevention functionality

Engineering Contradiction:

Improveauthentication accuracyVSAvoidtransmissivity measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The conductive layer is divided into multiple regions, with each region containing SRRs having open parts in different directions. This segmentation ensures that when the medium is tilted, at least some SRRs in each region maintain their resonance characteristics, stabilizing the overall transmissivity measurement and enabling accurate authentication regardless of orientation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the conductive layer are designed with locally optimized SRR orientations tailored to anticipated tilting directions. Each local region maintains effective transmissivity control for its specific orientation, while the composite structure provides stable overall authentication characteristics across multiple angles.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the transmissivity threshold is set to accommodate large variation ranges due to tilting, then more tilted media can be authenticated, but high-accuracy authentication cannot be performed

Engineering Contradiction:

Improveauthentication rangeVSAvoidauthentication accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

By dividing the conductive layer into regions with different SRR orientations, the system can accommodate a wider range of tilting angles while maintaining stable transmissivity characteristics in each region, thus expanding authentication range without sacrificing accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conductive layer functions as a composite structure combining multiple SRR types with different orientations. This composite design provides both the adaptability to handle various tilting angles and the precision needed for accurate authentication by maintaining stable transmissivity across orientations.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If SRRs with open parts in different directions are arranged in different regions to create region-specific transmissivity, then regional authentication is enabled, but the transmissivity variation becomes complex and unpredictable when tilted

Engineering Contradiction:

Improveregional transmissivity controlVSAvoidtransmissivity measurement consistency

Core Design Contradiction:

Manufacturing precisionVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

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

This approach ensures high-accuracy authentication by minimizing transmissivity changes when the structure is tilted, allowing for precise identification of the forgery prevention medium, even when subjected to varying angles, thereby enhancing security features.

Implementation Method 1

a resonator structure which resonates with a terahertz electromagnetic wave having a specific frequency

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

a transmissivity changes according to a polarization direction of the terahertz electromagnetic wave

Methodology Applied

Scientific EffectPolarisation: Polarisation

Data Source

PatentEP3686026B1Counterfeit preventing structure, counterfeit preventing medium, and counterfeit preventing structure inspecting method

Publication Date: 2021.12.29 GLORY LTD

Figure 1
Figure 2
Figure 3A~3B

AI summary

In order to perform high-accuracy authentication of a forgery prevention medium having a forgery prevention structure, a forgery prevention structure provided on a medium for performing authentication of the medium includes: an anisotropic resonator of which a transmissivity obtained when irradiated with a terahertz electromagnetic wave having a frequency at which the anisotropic resonator resonates, changes depending on a polarization direction of the terahertz electromagnetic wave; and an isotropic resonator of which a transmissivity obtained when irradiated with a terahertz electromagnetic wave having a frequency at which the isotropic resonator resonates, does not change depending on a polarization direction of the terahertz electromagnetic wave.