Sub-ppb detection using graphene nanomechanical resonators with optomechanical transduction

Published : 15 July 2019

Combining ultimate surface-to-volume ratio, ultra-low mass and elevated Young’s modulus, graphene rises as an optimal candidate for the next generation of ultra-low NEMS resonator dedicated to nano-gravimetric sensing. During this Ph.D., a prototype of a resonating graphene NEMS shall be fabricated and applied to mass sensing (being for gas or biological sensing). Current transduction techniques used for silicon NEMS are hardly adaptable to graphene resonators. Hence, the developement of these ultimate physics objects is currently hindered by lack of efficient transduction techniques. We aim, during this Ph.D. , at combining advantages offered by graphene resonator with an optomechanical transduction of its movement, so to demonstrate a sensor with the ability of sensing masses in the Dalton range or gaseous compounds concentration below the ppb limit. These resolutions are currently out-of-reach with current silicon NEMS technology

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