A novel realization of diffractive optically variable devices using ultrasonic modulation cutting

Ping Guo*, Yang Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Optically variable devices (OVDs) enable the angle-dependent optical effect for anti-counterfeiting. This paper proposes a multi-image encoding strategy and demonstrates single-, two-, and three-layer OVDs using ultrasonic modulation cutting. An analytical model that incorporates the diffractive intensity spectrum, resonance characteristics of diffraction efficiency, and grating geometry is presented to accurately predict the apparent color information in hue, saturation and brightness. Ultrasonic modulation cutting is proposed for ultrafast pixel-level rendering by tuning the grating spacing. Two-layer image encoding is achieved by interlacing gratings with spatially separated diffractive spectra, while a layer of relief image is added for three-layer image encoding.

Original languageEnglish (US)
Pages (from-to)575-578
Number of pages4
JournalCIRP Annals
Volume68
Issue number1
DOIs
StatePublished - 2019

Keywords

  • Micro machining
  • Optically variable device
  • Vibration

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'A novel realization of diffractive optically variable devices using ultrasonic modulation cutting'. Together they form a unique fingerprint.

Cite this