Xiangyong Wang

Fabrication and characterization of cerium-doped terbium gallium garnet with high magneto-optical properties

High optical quality (Tb((1-x))Ce(x))₃Ga₅O₁₂ (TCGG) single crystal has been grown by the Czochralski method. The optical and magneto-optical properties of the TCGG are analyzed in detail and the Verdet constant (V) of TCGG is compared with that of undoped terbium gallium garnet (TGG) crystal. TCGG presents a very high transmittance, particularly in the visible-near infrared (VIS-NIR) region, and its V is obviously larger than that of TGG in the VIS-NIR region. The figure of merit and optical features point out the superior characteristics of TCGG with respect to TGG.

High magneto-optical characteristics of Holmium-doped terbium gallium garnet crystal.

Magneto-optical characteristics of a new magneto-active material, (Tb_(1-x)Ho_x)₃Ga₅O₁₂ crystal, have been grown by the Czochralski (Cz) method. A high value of the Verdet constant was obtained at room temperature-namely, 214.9 and 77.8  rad·m^-1 T^-1 for 632.8 and 1064 nm, respectively. The Verdet constant of the Ho-doped terbium gallium garnet crystal at 1064 nm is about 2 times higher than that of terbium gallium garnet crystal. High value of magneto-optical figure-of-merit makes it an attractive next-generation magneto-optics material for high-power Faraday isolators.

First-principle study on coupling between arsenic in-suit impurities and mercury vacancies in HgCdTe

By using first-principle energy calculations, we found that the coupling structures between As in-suit substitute impurities and Hg vacancy in HgCdTe having p-type characteristics no matter As in-suit substitute Hg or Te atom. However, the characteristics of the coupling structures between As in-suit interstitial atom and mercury vacancy depend on the relative site of the interstitial atom.