Real-time imaging and wavevector analyses of radio waves incident to electromagnetic absorbers
Radio waves incident to electromagnetic absorbers have been experimentally visualized for the first time, which has been accomplished by the real-time visualization method for high-frequency electric field distributions: the live electrooptic imaging technique. Imaged have been electromagnetic reflections, refractions, and standing wave formations at sheet absorbers as well as gradual variations of wave fronts at a ravine plane of pyramidal absorber. Their wave properties have been clarified qualitatively as well as quantitatively by experimental mapped wave vectors.
Nanoscopic live electrooptic imaging
A door to the nanoscopic domain is opened regarding real-time visualization of electric field distributions and dynamics. Through the use of a live electrooptic imaging system with an oil-immersion objective lens and a highly thinned electrooptic sensor film, a minimum linewidth of 330 nm and a minimum peak splitting of 650 nm in real-time electric field video images have been successfully demonstrated. In addition, room to improve the resolution is noted, while a few problems that need to be solved are discussed, including an effect caused by optical interference.
Computational spectroscopy of carbon monoxide isotopomers in helium clusters.
The rotational excitation spectrum, including the vibrational shift of the rotational band, of several CO isotopomers solvated in He clusters has been calculated. Reptation quantum Monte Carlo simulations are used in conjunction with an accurate He-CO potential energy surface, which quantitatively describes the rovibrational spectrum of the binary complex. Our simulations, when compared with number-selective infrared spectra taken for different isotopomers, help discriminate among the alternative assignments proposed for cluster sizes around 15 He atoms. The origin of the vibrational band has a red shift that is nearly linear with the cluster size within the first solvation shell and is almost constant up to the largest cluster studied, well beyond completion of the second solvation shell. A blue upturn at even larger sizes would be needed to attain the nanodroplet limit, as recently estimated from the isotopic dependence of the measured R(0) transitions.