Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Quantum Optics and Photonics II
Q 42.4: Vortrag
Mittwoch, 7. März 2018, 15:00–15:15, K 0.016
Characterization of ultra-high-Q Si3N4 micro-ring resonators with high-precision temperature control — •Paul Kaufmann1, Xingchen Ji2, Kevin Luke2, Michal Lipson2, and Sven Ramelow1 — 1Humboldt-Universität zu Berlin, Berlin, Deutschland — 2Columbia-University, New York City, USA
On-chip integrated micro-resonators with vastly enhanced nonlinearities are increasingly relevant for application in quantum optics, e.g. as ultra-compact sources of entangled photon pairs. While commonly used in the telecom band, their application in the near-visible wavelength range of 800-900 nm is particularly interesting both for free space communication and to interface photons with optical transitions in alkali vapors used in quantum memories (i.e. Cs D2 at 852 nm). Here, we report the observation of ultra-high-Q resonances in high-confinement Si3N4 micro-ring resonators, reaching loaded Q-factors of 2× 106 at 850 nm corresponding to linewidths of 150 MHz. In contrast to common laser-scanning techniques, we characterize these narrow resonances using robust and cost-effective mK-precision temperature tuning of the chip. This allows us to control and characterize the temperature shift of the resonances with an unprecedented precision of 4 MHz/K. We will discuss advantages and limitations of this method and describe potential applications for our ultra-high-Q resonator devices as bright and compact narrow-band photon pair sources.