Hou Xintong, Yao Ni, You Lixing, Li Hao, Fang Wei, Zhang Weijun, Wang Zhen, Tong Limin, Xie Xiaoming
Appl Opt. 2020 Mar 1;59(7):1841-1845. doi: 10.1364/AO.386265.
The development of photonic quantum information technologies requires research on the properties of optical adhesives at cryogenic temperatures. In the process of developing microfiber (MF)-coupled superconducting nanowire single-photon detectors (SNSPDs), we invented a cryogenic-temperature refractive index (RI) measurement method based on a kind of MF device. The device was put into the cryostat to observe the variance of MF transmittance with temperature. Then an RI-temperature relationship was established through the correspondence between the confinement conditions of MFs of various diameters in an optical adhesive-${{\rm MgF}_2}$MgF environment and transmittance-temperature curves. Using this method, we analyzed the thermal-optical properties of a commercial fluorinated acrylic optical adhesive and obtained the RI values of the adhesive at various temperatures. The results were successfully applied in the development of broadband and high-efficiency MF-coupled SNSPDs.
光子量子信息技术的发展需要对低温下光学胶粘剂的性能进行研究。在开发微纤维（MF）耦合超导纳米线单光子探测器（SNSPD）的过程中，我们发明了一种基于某种MF器件的低温折射率（RI）测量方法。将该器件放入低温恒温器中，观察MF透过率随温度的变化。然后通过光学胶粘剂 - ${\rm MgF}_2$ 环境中不同直径MF的限制条件与透过率 - 温度曲线之间的对应关系，建立RI - 温度关系。利用该方法，我们分析了一种商用氟化丙烯酸光学胶粘剂的热光性能，并获得了该胶粘剂在不同温度下的RI值。这些结果成功应用于宽带高效MF耦合SNSPD的开发中。
