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Proceedings Paper

Optical actuation of silicon cantilevers: modelling and experimental investigation
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Paper Abstract

This paper reports on the modeling and experimental investigation of optical excitation of silicon cantilevers. In this work, the silicon cantilevers fabricated have dimensions with width of 15 μm, thickness of 0.26 μm, and variable length from 50 to 120 μm. In order to investigate the effect of the laser modulation frequency and position on the temperature at the anchor edge and displacements at the tip of cantilevers, a transient thermal ANSYS simulation and a steady-state static thermal mechanical ANSYS simulation were undertaken using a structure consisting of silicon device layer, SiO2 sacrificial layer and silicon substrate. The dynamic properties of silicon cantilevers were undertaken by a series of experiments. The period optical driving signal with controlled modulation amplitude was provided by a 405 nm diode laser with a 2.9 μW/μm2 laser power and variable frequencies. The laser spot was located through the longitude direction of silicon cantilevers. In factor, simulation results well matched with experimental observation, including: 1) for untreated silicon cantilevers, the maximum of displacement is observed when the laser beam was located half a diameter way from the anchor on the silicon suspended cantilever side; 2) for the both cantilevers, maximum displacement occurs when the optical actuation frequency is equal to the resonant frequency of cantilevers. Understanding the optical excitation on silicon cantilevers, as waveguides, can potentially increase sensing detection sensitivity (ratio of transmission to cantilever deflection).

Paper Details

Date Published: 17 May 2013
PDF: 14 pages
Proc. SPIE 8763, Smart Sensors, Actuators, and MEMS VI, 87632K (17 May 2013); doi: 10.1117/12.2018431
Show Author Affiliations
Fei Jiang, The Univ. of Western Australia (Australia)
Adrian Keating, The Univ. of Western Australia (Australia)
Mariusz Martyuink, The Univ. of Western Australia (Australia)
Dilusha Silva, The Univ. of Western Australia (Australia)
Lorenzo Faraone, The Univ. of Western Australia (Australia)
John M. Dell, The Univ. of Western Australia (Australia)

Published in SPIE Proceedings Vol. 8763:
Smart Sensors, Actuators, and MEMS VI
Ulrich Schmid; José Luis Sánchez de Rojas Aldavero; Monika Leester-Schaedel, Editor(s)

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