Optics, Lasers, Photonics, Optical Devices Physics 32 Materials 27 Electronics 26 Optical and Electronic Materials 26 Optical materials 26 Microwaves 17 Microwaves, RF and Optical Engineering 17 Optical engineering 17 Nanotechnology 15 Materials science 12 Classical Electrodynamics 11 Materials Science 11 Nanoscale Science and Technology 10 Nanoscience 10 Nanostructures 10 Engineering 9 Quantum Optics 9 Quantum optics 9 Semiconductors 9 Nanotechnology and Microengineering 7 Spectrum analysis 7 Microscopy 6 Spectroscopy and Microscopy 5 Thin films 5 Biomedical Engineering 4 Biomedical engineering 4 Circuits and Systems 4 Clean energy industries 4 Electrochemistry 4