香港大学申请研究生

We observed for the first time (to our knowledge) a new type of all optical double-quasi-steady-state photorefractive spatial soliton in a Cu:KNSBN crystal.The soliton was created without an applied electric field but with an inducing laser beam.An all optical switching effect was found in the formation of the soliton.

SiC buried layers were snythesized by a metal vapor vacuum arc ion source,with C+ ions implanted into crystalline Si substrates.According to X-ray photoelectron spectroscopy,the characteristic electron energy loss spectra of the SiC buried layers were studied.It was found that the characteristic electron energy loss spectra depend on the profiles of the carbon content,and correlate well with the order of the buried layers.