基于有限元法, 设计了一种六边形排列含CdSe/ZnS量子点薄膜结构的高双折射光子晶体光纤, 分析了具有不同厚度CdSe/ZnS量子点薄膜光子晶体光纤的色散及损耗特性.结果表明, 含CdSe/ZnS量子点薄膜结构的光子晶体光纤在x和y方向均存在基模.当泵浦光波长逐渐增加时, 具有相同厚度CdSe/ZnS量子点薄膜光子晶体光纤的双折射值逐渐增大, x和y方向总色散先增大后减小且存在两个零色散点, 损耗逐渐增大并在可见光波段趋近于零;具有不同厚度CdSe/ZnS量子点薄膜光子晶体光纤随CdSe/ZnS量子点薄膜厚度的增加, 在相同泵浦光波长处, 双折射值逐渐减小, x和y方向总色散逐渐减小且两个零色散点逐渐靠近, 损耗逐渐增大.通过沉积不同厚度CdSe/ZnS量子点薄膜和选择合适泵浦光波长, 可有效控制光子晶体光纤的色散和损耗.

With finite element method,a hexagon High Birefringence Photonic Crystal Fiber (HB-PCF) with two zero-dispersion dots and CdSe/ZnS quantum dots film was designed.The dispersion and loss characteristics of the designed HB-PCFs with the different thickness of CdSe/ZnS quantum dots films were analyzed.The results show that HB-PCFs with CdSe/ZnS quantum dots films exist the fundamental modes along the x- and y-axes of fibers.As pump wavelength increases,the birefringence of HB-PCFs with the same thickness of CdSe/ZnS quantum dots films increases gradually.And their dispersions increase first and then decrease along the x- and y-axes of fiber.The losses of HB-PCFs are close to zero in the visible region while they increase gradually in the infrared region.For the different thickness of CdSe/ZnS quantum dots films,the birefringence of HB-PCFs decreases gradually with the increase of quantum dot film thickness for the same pump wavelength.Their dispersions decrease gradually along the x- and y-axes of fiber,and their two zero-dispersion dots are close to each other,and their losses increase gradually.These research results indicate that the dispersions and losses of the HB-PCFs can be controlled effectively in experiment by depositing the different thickness of CdSe/ZnS quantum dots films and choosing a suitable pump wavelength.