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Measuring the refractive index of optical adhesives at cryogenic temperatures

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Abstract

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–${{\rm MgF}_2}$ 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.

© 2020 Optical Society of America

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