Related by context. Frequent words. (Click for all words.) 63 isotropic 63 photometry 63 electron spins 62 absorbance 61 interferometry 61 exciton 60 diffractive 60 shorter wavelengths 60 interferometers 60 excitons 60 photonic crystal 60 laser pulse 59 photodetector 59 ionised 59 dispersive 59 magnetization 59 dipoles 59 anisotropy 58 optical wavelengths 58 photometer 58 interferometer 58 amplitudes 58 keV 58 photon 58 electron density 58 frequency comb 58 dopant 57 #μm [002] 57 X ray emission 57 muon 57 Cepheids 57 luminous flux 56 photons 56 superposition 56 toroidal 56 picosecond 56 visible wavelengths 56 fluorophores 56 dye molecules 56 rubidium 56 attosecond 56 fermions 56 quantized 56 collimator 56 muons 56 Fig. 1A 55 excitations 55 hemispherical 55 magnetic flux 55 GeV 55 electrically conducting 55 ionize 55 InGaN 55 #.#μm [001] 55 crystal lattice 55 hydrogen atom 55 porphyrin 55 wavelengths 55 photodiode 55 SiO 2 55 antiprotons 55 cuprates 55 z = 55 heliosheath 55 ionized gas 55 sinusoidal 55 excitation 54 pulsed laser 54 electron 54 terahertz radiation 54 conductance 54 bosons 54 micrometer 54 active galactic nuclei 54 fluorescing 54 phonons 54 polarizations 54 ionisation 54 InGaAs 54 supernova remnant 54 X ray beam 54 waveguides 54 Photons 54 hydrogen atoms 54 nm wavelength 54 ferromagnetic 54 redshifts 54 #μm [001] 54 optically 54 superfluid 54 bandgap 54 anisotropic 54 magnetar 54 polarity 54 refractive index 54 Brownian motion 54 oxygen atom 53 wavefront 53 atoms 53 Fresnel 53 RGB LED