Related by context. Frequent words. (Click for all words.) 65 Gamma rays 62 shorter wavelengths 61 visible wavelengths 61 fluorophores 60 ultraviolet UV light 60 excitons 60 Ultraviolet light 60 near infrared NIR 59 dye molecules 59 ionised 59 ultrasonic waves 59 millivolts 58 terahertz radiation 58 infrared rays 58 photons 58 wavelengths 58 microwave radiation 58 chromophores 58 Cosmic rays 57 X ray emission 57 microchannels 57 infrared radiation 57 electron beams 57 ionize 57 interferometers 57 photonic crystal 57 photodetector 57 X ray beam 57 microbubbles 57 keV 57 magnetic fields 56 optical wavelengths 56 alpha particles 56 ultra violet rays 56 electrochemical reaction 56 exciton 56 photodiodes 56 microelectrodes 56 X ray beams 56 hydrogen atoms 56 ultraviolet light 56 VCSELs 56 Photons 56 hydrogen ions 56 porphyrin 56 microwave frequencies 56 ionized gas 55 pulsed laser 55 excitations 55 electromagnetic waves 55 dopant 55 magnetic flux 55 absorbance 55 gamma rays 55 resonant frequency 55 photometer 55 UV light 55 muons 55 frequency comb 55 spectrographs 55 photon 55 photodiode 55 laser pulse 55 gold nanorods 55 laser pulses 55 photocell 55 hydrocarbon molecules 55 aerosol particles 55 nm wavelength 54 collimator 54 interferometric 54 spectrally 54 resonators 54 ionisation 54 Hawking radiation 54 aldehydes 54 MeV 54 diffractive 54 reactants 54 active galactic nuclei 54 antiprotons 54 waveguide 54 electron spins 54 fluorescence 54 resonator 54 optical microscopes 53 radioactive tracer 53 silicon atoms 53 fluorescent dyes 53 milliwatt 53 airflows 53 ionizing 53 infrared wavelengths 53 nanospheres 53 shorter wavelength 53 infrared IR 53 carbonic acid 53 sunrays 53 dispersive 53 electromagnetic interference EMI 53 parallax barrier