However , when a voltage is applied across a cell , the molecules straighten out , lessening or totally losing the circular birefringence .
This causes circular birefringence , and is engineered so that there is a 90 degree rotation of the linear polarization state .
When a voltage is applied across a cell , the molecules straighten out , lessening or totally losing the circular birefringence .
This causes circular birefringence , and is engineered so that there is a 90 degree rotation of the linear polarization state .