Forcefields date back to ancient times when armies would build walls of stones, logs, or other materials in an effort to protect their forces from enemy arrows, spears, and other missiles. Today, forcefields are still a common defense mechanism used by militaries and governments.

A forcefield is created by Linear Polarization

A forcefield is created by Linear Polarization by using electromagnetic waves. When waves hit a boundary they are forced to change direction. This shift in polarization creates a force that keeps the waves moving in a specific direction.