University of Toronto

Bank of Canada

Peter Herman

Charles Douglas MacPherson

Badr Omrane

Sean Magnus Malmberg

Stephen Paulchi Ho

Ehsan Alimohammadian

Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one array of patterns such as laser-fabricated patterns, or other structures, optionally formed for example from elongate laser-modified tracks extending within a document substrate. The patterns are combined with at least one array of microlenses to cause certain optical effects. Also disclosed are the use of such devices for document authentication, and methods for their production.

Optical devices comprising microlenses and laser-fabricated patterns or structures, their manufacture and use

Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which can exhibit excellent diffractive effects. Also disclosed are the use of such devices for document authentication and methods for their production.

Diffractive structures within polymer substrates, their manufacture and use

Growing community of inventors

Toronto, Canada

Peter Herman