Related by context. Frequent words. (Click for all words.) 58 optical wavelengths 58 photoluminescence 58 X ray emission 57 visible wavelengths 57 toroidal 57 diffraction pattern 57 stimulated emission 56 anisotropy 56 accretion disk 56 terahertz radiation 56 magnetic flux 56 isotropic 56 irradiance 56 interferometers 56 beam splitter 56 diffractive 56 ionized gas 56 active galactic nuclei 56 anisotropic 56 GeV 56 shorter wavelengths 56 photodetector 55 exciton 55 waveguides 55 directivity 55 surface plasmons 55 torus 55 MeV 55 Fig. 1A 55 sinusoidal 55 pulsed laser 55 protostar 55 gravitational lens 54 phonon 54 interferometric 54 electrically conducting 53 ionised 53 convective 53 dispersive 53 electron spins 53 oscillatory 53 #μm [002] 53 interferometry 53 keV 53 Hawking radiation 53 dipole 53 porphyrin 53 reactant 53 collimator 53 amplitudes 53 magnetization 53 Cepheids 53 ecliptic 53 galaxy NGC 53 fluorophores 53 temperature gradient 52 waveguide 52 excitations 52 impedances 52 synchrotron radiation 52 electron beams 52 millivolts 52 frequency comb 52 frequency modulation 52 ultraviolet wavelengths 52 radiative 52 gravitational lensing 52 γ 52 ionisation 52 photodiode 52 photometer 52 electrophoretic 52 tropospheric 52 interferometer 51 dopant 51 gravitational wave 51 laser pulse 51 planar 51 negative refraction 51 angular momentum 51 decoherence 51 vortices 51 luminosity 51 z axis 51 adiabatic 51 metastable 51 nonlinearity 51 transmissive 51 photometry 51 orbiting planets 51 magnetic reconnection 51 WASP #b 51 solar corona 51 pulsations 51 microwave frequencies 51 plasmonic 51 absorbance 51 plasmons 51 oscillations 51 transmittance 51 superlens