De Leonardis Francesco, Soref Richard A, Soltani Mohammad, Passaro Vittorio M N
Dipartimento di Ingegneria Elettrica e dell'Informazione, Politecnico di Bari Via Edoardo Orabona n. 4, 70125, Bari, Italy.
Department of Engineering, The University of Massachusetts, Boston, Massachusetts, 02125, USA.
Sci Rep. 2017 Sep 12;7(1):11387. doi: 10.1038/s41598-017-11617-y.
We present a physical investigation on the generation of correlated photon pairs that are broadly spaced in the ultraviolet (UV) and visible spectrum on a AlGaN/AlN integrated photonic platform which is optically transparent at these wavelengths. Using spontaneous four wave mixing (SFWM) in an AlGaN microring resonator, we show design techniques to satisfy the phase matching condition between the optical pump, the signal, and idler photon pairs, a condition which is essential and is a key hurdle when operating at short wavelength due to the strong normal dispersion of the material. Such UV-visible photon pairs are quite beneficial for interaction with qubit ions that are mostly in this wavelength range, and will enable heralding the photon-ion interaction. As a target application example, we present the systematic AlGaN microresonator design for generating signal and idler photon pairs using a blue wavelength pump, while the signal appears at the transition of ytterbium ion (Yb, 369.5 nm) and the idler appears in the far blue or green range. The photon pairs have minimal crosstalk to the pump power due to their broad spacing in spectral wavelength, thereby relaxing the design of on-chip integrated filters for separating pump, signal and idler.
我们展示了在AlGaN/AlN集成光子平台上对紫外（UV）和可见光谱中宽间隔相关光子对产生的物理研究，该平台在这些波长下是光学透明的。利用AlGaN微环谐振器中的自发四波混频（SFWM），我们展示了满足光泵浦、信号和闲频光子对之间相位匹配条件的设计技术，由于材料的强正常色散，该条件在短波长下运行时至关重要且是一个关键障碍。这种紫外 - 可见光子对对于与大多处于该波长范围内的量子比特离子相互作用非常有益，并将能够预示光子 - 离子相互作用。作为一个目标应用示例，我们展示了使用蓝光波长泵浦产生信号和闲频光子对的系统AlGaN微谐振器设计，而信号出现在镱离子（Yb，369.5 nm）的跃迁处，闲频出现在远蓝光或绿光范围内。由于光子对在光谱波长上的宽间隔，它们与泵浦功率的串扰最小，从而放宽了用于分离泵浦、信号和闲频的片上集成滤波器的设计。
