fix writer
fix writer

SchadkoAO/FDTD_Solver,SchadkoAO/FDTD_Solver,AlexHatesUnicorns/FDTD_Solver,AlexHatesUnicorns/FDTD_Solver,SchadkoAO/FDTD_Solver,SchadkoAO/FDTD_Solver,SchadkoAO/FDTD_Solver,SchadkoAO/FDTD_Solver