Electrodynamics 38 Optics 38 Optics and Electrodynamics Physics 25 Microwaves 12 Microwaves, RF and Optical Engineering 12 Optical engineering 12 Spectrum analysis 9 Microscopy 8 Spectroscopy and Microscopy 8 Laser Technology, Photonics 7 Lasers 7 Photonics 7 Atoms 6 Chemistry, Physical and theoretical 5 Electronics 5 Engineering 5 Atomic, Molecular, Optical and Plasma Physics 4 Earth sciences 4 Materials science 4 Measurement 4 Measurement Science and Instrumentation 4 Optics, Optoelectronics, Plasmonics and Optical Devices 4 Optoelectronics 4 Physical Chemistry 4 Physical measurements 4 Plasmons (Physics) 4 Characterization and Evaluation of Materials 3 Earth Sciences 3 Magnetic materials 3