Sicherheitsmerkmal

Details

Veröffentlichungs-Nr.

EP4789877

Anmeldetag

5. Februar 2025

Veröffentlichung

12. August 2026

Rechtsraum

EP

Abstract

Visual security feature comprising a substrate (2) located in a region of an object (1) and elongated metallic nanoparticles (3) non-randomly arranged in the substrate (2). When illuminated with a linearly polarized visible light (4), the feature will produce a color according to the angle between the electric field vector of the linearly polarized light (4) and the longitudinal axis of the elongated metallic nanoparticles (3), therefore changing the angle by rotating the object or the light emitter (5) will change the color of the substrate (2). The nanoparticles (3) can incorporate fluorescent materials, so that under an exciting linearly polarized light (4) the feature will produce a fluorescence that will vary in intensity according to the angle between the electric field vector of the exciting light and the longitudinal axis of the elongated metallic nanoparticles (3). Changing the angle by rotating the object (1) or the light emitter (5) will produce the effect of varying the intensity of the fluorescence.

Anmelder

Firma

Ruiz Quevedo, Andrés

Land

🇪🇸 Spanien