Gai X, Wang R P, Xiong C, Steel M J, Eggleton B J, Luther-Davies B
Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, The Australian National University, Canberra ACT, Australia.
Opt Express. 2012 Jan 16;20(2):776-86. doi: 10.1364/OE.20.000776.
We show that highly nonlinear chalcogenide glass nanowire waveguides with near-zero anomalous dispersion should be capable of generating correlated photon-pairs by spontaneous four-wave mixing at frequencies detuned by over 17 THz from the pump where Raman noise is absent. In this region we predict a photon pair correlation of >100, a figure of merit >10 and brightness of ~8×10(8) pairs/s over a bandwidth of >15 THz in nanowires with group velocity dispersion of <5 ps∙km(-1) nm(-1). We present designs for double-clad Ge(11.5)As(24)Se(64.5) glass nanowires with realistic tolerance to fabrication errors that achieve near-zero anomalous dispersion at a 1420 nm pump wavelength. This structure has a fabrication tolerance of 80-170 nm in the waveguide width and utilizes a SiO(2)/Al(2)O(3) layer deposited by atomic layer deposition to compensate the fabrication errors in the film thickness.
我们表明，具有近零反常色散的高度非线性硫族化物玻璃纳米线波导应该能够通过自发四波混频在与泵浦频率失谐超过17太赫兹且不存在拉曼噪声的频率处产生关联光子对。在该区域，我们预测在群速度色散小于5皮秒·千米⁻¹·纳米⁻¹的纳米线中，光子对关联度大于100，品质因数大于10，在大于15太赫兹的带宽上亮度约为8×10⁸对/秒。我们给出了双包层Ge(11.5)As(24)Se(64.5)玻璃纳米线的设计，该设计对制造误差具有实际的容忍度，在1420纳米泵浦波长下实现近零反常色散。这种结构在波导宽度上具有80 - 170纳米的制造容忍度，并利用通过原子层沉积沉积的SiO₂/Al₂O₃层来补偿膜厚的制造误差。
