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Dynamically tunable optomechanical large mode suspended waveguide for high power and broadband guided optics (Conference Presentation)
Author(s): Enrico Casamenti; Tao Yang; Yves Bellouard
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Paper Abstract

Not only are waveguides fundamental as a light carrier, yet they are also key elements for countless optical components such as couplers, modulators and oscillators to name a few. Modulating waveguides is usually performed using electro-optics or acousto-optics principles involving, among others, specific crystals such as Lithium-Niobate or glass thermal poling to introduce second order non-linearity. In this work, we investigate a waveguide phase-modulation based on optomechanics and in particular photoelasticity. Specifically, a fused silica suspended 3D waveguide suitable for a broad visible and near-infrared spectrum and able to carry a large single mode is implemented in the form of a double-clamped suspended beam. This optomechanical device oscillates up to kHz frequencies thanks to the use of dielectrophoresis excitation, resulting from a varying non-linear electric field. The suspended waveguide seats in a V-shape groove providing the electrostatic field. The full device is manufactured out of a single piece of silica through femtosecond laser exposure combined with chemical etching. In addition, a CO2-laser polishing step is added to achieve high surface quality and prevent scattering losses. The dynamic response of this optomechanical device can be further tuned - using the same femtosecond laser - to shift from a non-linear hardening frequency response to a linear one or to a softening mode.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10908, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIX, 109080P (4 March 2019); doi: 10.1117/12.2514097
Show Author Affiliations
Enrico Casamenti, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Tao Yang, Ecole Polytechnique Fédérale de Lausanne (Netherlands)
Yves Bellouard, Ecole Polytechnique Fédérale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 10908:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIX
Peter R. Herman; Michel Meunier; Roberto Osellame, Editor(s)

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