Related by context. Frequent words. (Click for all words.) 60 ultrasonic waves 60 infrared beam 55 infrared rays 55 terahertz radiation 54 microwave radiation 54 electromagnetic waves 53 ganglion cells 53 fluorescent molecules 53 magnetic pulses 53 laser pulses 52 tuning forks 52 electromagnetic pulses 51 echolocation 50 oscillatory 50 pulsed laser 50 X ray beam 50 infrared beams 50 infrared radiation 50 dispersive 50 gold nanorods 50 laser pulse 50 photonic crystal 50 electrically conducting 50 microelectrodes 49 fluoresces 49 ultraviolet UV light 49 laser beams 49 ultraviolet wavelengths 49 nanosensor 49 radioactive tracer 49 fluorescent dye 49 microwave frequencies 49 X ray fluorescence 49 photoluminescence 49 electrical impulses 49 electromagnetic induction 49 infra red 48 absorbance 48 entangled photons 48 beam splitter 48 chemiluminescent 48 lasing 48 ultrasonic 48 tracer 48 electrochemically 48 infrared 48 infrared IR 48 spectrally 48 Ultraviolet light 48 diffraction pattern 48 voltmeter 48 shorter wavelengths 48 parallax barrier 48 Tesla coil 48 inchworm 48 binaural 48 electrical currents 48 electron beams 48 infrared laser 48 resonant frequency 48 superlens 47 photodiode 47 alpha particle 47 near infrared NIR 47 electromagnetic 47 infra red cameras 47 dye molecules 47 electrodes 47 Gamma rays 47 photosensitive 47 cloaking device 47 photodetector 47 electromagnet 47 sine wave 47 electromagnetic EM 47 mouthparts 47 near infrared spectroscopy 47 collimator 46 ultra violet light 46 ultrasonics 46 calorimeter 46 atmospheric turbulence 46 chromophores 46 laser beam 46 electrical pulses 46 nanospheres 46 emitted 46 visible wavelengths 46 camera viewfinder 46 fluorescent probes 46 frequency comb 46 X ray beams 46 ionize 46 photocell 46 combustion gases 46 photonic crystals 46 infrasound 46 optically 46 interferometric 46 phonon 46 infrared imagery