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Q: Fachverband Quantenoptik und Photonik

Q 21: Optomechanics I

Q 21.6: Vortrag

Montag, 5. März 2018, 17:30–17:45, K 0.023

Optomechanically coupled nanospike array on the endface of a fibre — •Zheqi Wang, Shangran Xie, Xin Jiang, and Philip Russell — Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany

Arrays of optically coupled mechanical oscillators are promising for exploring the light-controlled linear and nonlinear dynamics of complex systems. Here we report the fabrication and characterization of an optomechanically coupled glass nanospike array on the endface of a multi-core fibre. The multi-core fiber is made from soft glasses by the stack-and-draw technique, using two types of specially developed germanate glasses with widely different etch rates when subjected to a solution of nitric acid. Through wet-etching at one end of the fiber, an array of free-standing nanospikes can be obtained at the fiber endface. We have fabricated a fiber with a close-packed hexagonal array of seven cores of diameter 1.1 µm, the core centres being spaced 1.5 µm apart. After etching, the cladding material is removed, resulting in seven suspended conical nanospikes of length ∼20 µm. The diameter at the very end of the nanospikes is less than 50 nm. The optical mode in each step-index core spreads out adiabatically as it travels towards the tip, resulting in strong coupling between the individual nanospikes and significant optical forces that can be used to drive the mechanical motion of the nanospikes. The strength of the optomechanical interaction is estimated by numerical simulations and confirmed by preliminary experimental results. This unique system offers many new possibilities for exploring the behaviour and applications of optomechanical arrays.