2019/04/10 by Timothy P. McKenna, Rishi N. Patel, McKenna, Timothy P. +9
Engineering · Neuroscience · Physics and Astronomy · #Advanced MEMS and NEMS Technologies #FOS: Physical sciences #Mechanical and Optical Resonators #Optics (physics.optics) #Photoreceptor and optogenetics research #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.1904.05293
openalex publication_date 2019/04/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The need for highly accurate, labor-intensive optical alignment has been a major hurdle in our ability to leverage the power of complex photonic integrated circuits. There is a strong need for tolerant and passive alignment methods that enable interrogation at any point in a photonic circuit. Various promising and scalable photonic packaging techniques have been under development, but few methods compatible with low-temperature operation have been reported. Here, we demonstrate alignment-free 25% coupling efficiency from an optical fiber to a silicon optomechanical crystal at 7 mK in a dilution refrigerator. Our coupling scheme uses angle-polished fibers glued to the surface of the chip. The technique paves the way for scalable integration of optical technologies at low temperatures, circumventing the need for optical alignment in a highly constrained cryogenic environment. The technique is broadly applicable to studies of low-temperature optical physics and to emerging quantum photonic technologies.