基于CdSe/ZnS量子点薄膜结构的高双折射光子晶体光纤的色散与损耗控制  

Dispersion and Loss Control of High Birefringence Photonic Crystal Fiber with CdSe/ZnS Quantum Dots Film

作　　者：耿琰[1] 王河林[1] 陈中师 

机构地区：[1]浙江工业大学理学院应用物理系,杭州310023

出　　处：《光子学报》2015年第1期92-100,共9页Acta Photonica Sinica

基　　金：浙江省自然科学基金(No.LY12F05006);浙江省教育厅基金(No.Y201121906)资助

摘　　要：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.

关 键 词：光子晶体光纤 CdSe/ZnS量子点 薄膜 双折射 色散 损耗 控制 

分 类 号：O436.2[机械工程—光学工程] O435.1[理学—光学]