An evanescent field driven mono-molecular layer photoswitch: coordination and release of metallated macrocycles

Photoswitching of 'on' and 'off' coordination sites in a self assembled monolayer containing the 4-(arylazo)pyridine chromophore has been achieved using the evanescent field and illustrated through coordination and photon induced release of zinc tetraphenylporphyrin.     

Experimental evidence for supercontinuum generation by fission of higher-order solitons in photonic fibers

We report on an experimental study of supercontinuum generation in photonic crystal fibers with low-intensity femtosecond pulses, which provides evidence for a novel spectral broadening mechanism. The observed results agree with our theoretical calculations carried out without making the slowly varying envelope approximation. Peculiarities of the measured spectra and their theoretical explanation demonstrate that the reason for the white-light generation in photonic crystal fibers is fission of higher-order solitons into redshifted fundamental solitons and blueshifted nonsolitonic radiation.     

A new paraelectric center in lithium-doped KBr

We report paraelectric resonance measurements for KBr:Li⁺⁷ and KBr:Li⁺⁶. The observed zero-field splittings are large - 62, 65, and 141.5 GHz ± 1 GHz in KBr:Li⁺⁷, and 88 and 118 GHz ± in KBr:Li⁺⁶ — giving an isotope shift of 40% for the lower lines. The uncorrected dipole moment is p = 0.98 ± 0.05 eA. The presence of OH^- seems to suppress the Li⁺ signal.