Spin-polarized Second Harmonic Generation from the Antiferromagnetic CaCoSO Single Crystal.

ABSTRACT: The spin-polarized second harmonic generation (SHG) of the recently synthesized CaCoSO single crystal is performed based on the calculated electronic band structure. The calculation reveals that the spin-up (?) channel of CaCoSO possesses a direct energy gap (?^v-?^c) of about 2.187?eV, 1.187?eV (K^v-K^c) for the spin-down (?) channel and an indirect gap (?^v-K^c) of about 0.4?eV for the spin-polarized CaCoSO single crystal. The linear optical properties obtained reveal that the recently synthesized crystal exhibits considerable anisotropy with negative uniaxial anisotropy and birefringence favor to enhance the SHG. We have calculated the three non-zero tensor components of the SHG and found the is the dominat component, one with a large SHG of about (d₃₃?=?6.936?pm/V at ??=?1064?nm), the half value of KTiOPO₄ (KTP). As the values of (?)? (?) 1.187?eV> spin-polarized gap 0.4?eV; therefore, a smaller energy gap gives better SHG performance. Furthermore, the microscopic first hyperpolarizability, ?_ijk, is calculated.

SUBMITTER: Reshak AH 

PROVIDER: S-EPMC5390297 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature