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Conference on Lasers and Electro-Optics

Linear and Non-linear Light-Vapor interaction in ultra-compact serpentine atomic cladding wave guides

Liron Stern, Boris Desiatov, Noa Mazurski, Uriel Levy

Published Jan 1, 2016• 1 citation
Publisher

Abstract

We present and experimentally demonstrate an ultra-compact and efficient apparatus for chips-scale linear and non-linear light vapor interactions, based on an atomic cladding nano-scale waveguides. Both low power saturation, and Autler-Townes splitting are observed.
DOI
10.1364/cleo_qels.2016.ftu4b.1

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In recent years, there has been marked increase in research aimed to introduce alkali vapours into guided-wave configurations. Owing to the significant reduction in device dimensions, the increase in density of states, the interaction with surfaces and primarily the high intensities carried along the structure, a plethora of light-vapour interactions can be studied. Moreover, such platform may exhibit new functionalities such as low-power nonlinear light-matter interactions. One immense challenge is to study the effects of quantum coherence and shifts in nanoscale waveguides, characterized by ultra-small mode areas and fast dynamics. Here, we construct a highly compact 17 mm long serpentine silicon-nitride atomic vapour cladding waveguide. Fascinating and important phenomena such as van-der-Waals shifts, dynamical stark shifts and coherent effects such as strong coupling (in the form of Autler-Townes splitting) are observed. Some of these effects may play an important role in applications such as all-optical switching, frequency referencing and magnetometry.
Alkali vapours, such as rubidium, are being used extensively in several important fields of research such as slow and stored light nonlinear optics quantum computation, atomic clocks and magnetometers. Recently, there is a growing effort towards miniaturizing traditional centimetre-size vapour cells. Owing to the significant reduction in device dimensions, light–matter interactions are greatly enhanced, enabling new functionalities due to the low power threshold needed for nonlinear interactions. Here, taking advantage of the mature platform of silicon photonics, we construct an efficient and flexible platform for tailored light–vapour interactions on a chip. Specifically, we demonstrate light–matter interactions in an atomic cladding waveguide, consisting of a silicon nitride nano-waveguide core with a rubidium vapour cladding. We observe the efficient interaction of the electromagnetic guided mode with the rubidium cladding and show that due to the high confinement of the optical mode, the rubidium absorption saturates at powers in the nanowatt regime. Alkali vapours are increasingly useful in photonic research and metrology applications, and they provide a useful test bed for investigating light–matter interaction. Stern et al. integrate silicon nitride waveguides with alkali vapours to study light–matter interactions on a chip-scale platform.