A special types of crystal that can hold large amounts of information.
Photonic Crystals have metal elements within them, that arrange to metallic, dielectric structures. This caused them to be able to hold large amounts of energy and/or information.
- Ice Lords: This was the bases of their technology
- Axion: It's internal main crystal was composed of this.
- Spark Holders: Safely carrying a spark
- Super A.I.: Photonic Crystals are often use to create the physical hardware of Super A.I. processors.
- Plasma Hearts: Photonic Crystals are used in the creation of Plasma Hearts in many universes.
- Based of the item from Transformers IDW