Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS


GANOMS Berichtzusammenfassung

Project ID: 306664
Gefördert unter: FP7-IDEAS-ERC
Land: France

Mid-Term Report Summary - GANOMS (GaAs Nano-OptoMechanical Systems)

A Nano-OptoMechanical System (NOMS) is a natural interface between nanomechanical motion and photons. The performances of a NOMS depend crucially on the level of optomechanical coupling, optical dissipation and mechanical dissipation. For sufficient coupling, the nanomechanical motion is efficiently imprinted on photons and measured with the assets of optical detection: ultra-fast and -sensitive. If dissipation is weak, the mechanical motion can be amplified or cooled by optical forces, and its quantum nature ultimately revealed. This creates new opportunities for nanomechanical sensing, both classical or quantum, which the project aim at exploring and making compliant with on-chip applications.

The GANOMS project (Gallium Arsenide NanoOptoMechanical Systems) has allowed better understanding and optimization of miniature optomechanical disk resonators fabricated out of the Gallium Arsenide semiconductor material (GaAs). The advantageous photo-elastic properties of GaAs have allowed attaining unprecedented level of optomechanical coupling with these resonators during the project. The technological maturity of theis semiconductor platform, notably the possibility of engineering lattice-matched heterostructures, has enabled new types of mechanical anchors to be designed and fabricated, leading to Q.f factors above 10^13 for GaAs-based resonators. The origin of optical dissipation in GaAs disk resonators has been analyzed and modeled in depth, with a combination of high resolution structural microscopy, advanced electromagnetic modeling and systematic optical laser spectroscopy in various conditions.

The project has demonstrated the operation of GaAs nano-optomechanical systems in liquids, and allowed developing a complete understanding of fluidic optomechanical interactions at high frequency (GHz), revealing a high potential in the sensing of rheological information. Force sensing experiments have been realized under ambient air conditions as well, to demonstrate nano-optomechanical control of a force field applied onto the NOMS. Multiple NOMS mutually coupled on the same chip could be fabricated and put in interaction, and first collective behavior could be observed as well.

A single GaAs disk NOMS could be operated in cryogenic environment using an instrument specially developed for the project. The NOMS was brought close to the quantum regime of optomechanics, with 40 residual phonons in the mechanical mode, reaching sufficient cooperativity for ground-state cooling. New situations merging Cavity-QED and Optomechanics could be clarified, with a complete theoretical treatment of a three-partite system involving an atom, an optical cavity and a mechanical resonator. Quantum wells were inserted in GaAs NOMS to tune optomechanical interactions, and the optical and mechanical properties of the NOMS investigated systematically to prepare the second half of the project.

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