Dr. Eva M. Weig Profile

Dr. Eva M. Weig

at Univ. Konstanz

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Proceedings Article | 8 March 2019 Presentation

Thermal noise-induced nonlinear dynamics of driven nanomechanical resonators (Conference Presentation)

Eva Weig

Proceedings Volume 10926, 109261Z (2019) https://doi.org/10.1117/12.2514941

KEYWORDS: Nonlinear dynamics, Resonators, Silicon, Excel, Dielectrics, Electrodes, Satellites, Switching

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Doubly-clamped pre-stressed silicon nitride string resonators excel as high Q nanomechanical systems enabling room temperature quality factors of several 100,000 in the 10 MHz eigenfrequency range. Dielectric transduction ideally complements the silicon nitride strings, providing an all-electrical control scheme while retaining the large mechanical quality factor [1,2]. It is mediated by an inhomogeneous electric field created between adjacent electrodes. The resulting gradient field provides an integrated platform for actuation, displacement detection, frequency tuning as well as strong mode. Dielectrically controlled silicon nitride strings are an ideal testbed to explore a variety of dynamical phenomena ranging from multimode coupling to coherent control. Here I will focus on the nonlinear dynamics of a strongly driven string [3,4]. While the response of the string is described by the cubic nonlinearity of the well-established Duffing model, the power spectrum reveals a series of interesting satellite peaks. I will show how they reflect the dynamics of the driven string in the presence of thermal noise, enabling insights into the squeezing of thermal fluctuations as well as nonlinear switching phenomena. [1] Q. P. Unterreithmeier et al., Nature 458, 1001 (2009). [2] J. Rieger et al., Appl. Phys. Lett. 101, 103110 (2012). [3] M. Seitner et al., Phys. Rev. Lett. 118, 254301 (2017). [4] J. Huber et al., in preparation

Proceedings Article | 5 June 2010 Paper

Cavity nano-optomechanics: a nanomechanical system in a high finesse optical cavity

Sebastian Stapfner, Ivan Favero, David Hunger, Philipp Paulitschke, Jakob Reichel, Khaled Karrai, Eva Weig

Proceedings Volume 7727, 772706 (2010) https://doi.org/10.1117/12.854066

KEYWORDS: Optical microscopes, Resonators, Optical resonators, Linear filtering, Glasses, Semiconductor lasers, Oscillators, Nitrogen, Sensors, Nanorods

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The coupling of mechanical oscillators with light has seen a recent surge of interest, as recent reviews report. ^1,2 This coupling is enhanced when confining light in an optical cavity where the mechanical oscillator is integrated as backmirror or movable wall. At the nano-scale, the optomechanical coupling increases further thanks to a smaller optomechanical interaction volume and reduced mass of the mechanical oscillator. In view of realizing such cavity nanooptomechanics experiments, a scheme was proposed where a sub-wavelength sized nanomechanical oscillator is coupled to a high finesse optical microcavity. ³ Here we present such an experiment involving a single nanomechanical rod precisely positioned into the confined mode of a miniature Fabry-Pérot cavity. ⁴ We describe the employed stabilized cavity set-up and related finesse measurements. We proceed characterizing the nanorod vibration properties using ultrasonic piezo-actuation methods. Using the optical cavity as a transducer of nanomechanical motion, we monitor optically the piezo-driven nanorod vibration. On top of extending cavity quantum electrodynamics concepts to nanomechanical systems, cavity nano-optomechanics should advance into precision displacement measurements near the standard quantum limit ⁵ , investigation of mechanical systems in their quantum regime, non-linear dynamics ⁶ and sensing applications.

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