Photonic crystal

are a storage medium used by magi, beyond the means of modern science to produce in great quantity.
==Characteristics==
Photonic crystals enclose light, regulating it through the use of nano-structures. The of the crystals periodically changes. Through manipulation of the photoconductivity of the crystals, light is used as a medium through which is made possible.Fate/the Fact - Pg. 04
For modern humanity, research into their creation is just in the starting phase, the largest size of crystal developed as of the start of the 21st century measuring less than several centimeters. Magi of Atlas created Tri-Hermes, something that cannot be replicated by modern science.Fate/Grand Order - Camelot: The Sacred Round Table Realm - Section 14: The Hidden Research The ancient race that created the Moon Cell billions of years before modern day utilized photonic crystals 30km in size, producing a massive super computer.
 has similar properties.
==Structures using photonic crystals==
*Moon Cell
*Philosopher's Stone
*Tri-Hermes
*Library of Alexandria
**Bibliotheca Basileus
==References==
Category:Terminology in Fate/Grand Order
Category:Terminology in Fate/EX
Category:Magecraft terminology
Category:Terminology in Fate/Prototype