On 21 October, we celebrate Photonics Day and the importance of light in modern technological development.

Photonics is the science of light and its fundamental particles (photons) that aims to study how light is generated, transmitted, detected, and processed. It is one of the most influential research fields shaping our daily lives, from communication technologies to medical innovations.

On 21 October, 1983, the numerical value of the speed of light (299,792.458 km/s) was officially adopted – a key milestone in science that symbolises the rapid progress of innovations continuing to this day.

Photonics Day reminds us of the essential role light plays in technologies that make our lives more convenient, safe, and enjoyable.