IQIM Postdoctoral and Graduate Student Seminar

Friday May 25, 2012 4:30 PM

Design of an optomechanical accelerometer

Speaker: Alex Krause, Applied Physics, Caltech
Location: East Bridge 114

Title: Design of a high-precision wide-bandwidth optomechanical accelerometer: Or, how I learned to stop worrying and love stress

In this talk I will cover our design and demonstration of a low-noise high-bandwidth optomechanical accelerometer. The accelerometer is fabricated from a beam of highly-stressed thin-film Silicon Nitride with mechanical quality factor over 1 million. Displacements of this beam are sensed via an integrated photonic crystal cavity. We demonstrate acceleration sensing over a 27kHz bandwidth with resolutions exceeding any commercial optical accelerometer system. Furthermore, we show cooling of the mechanical mode down to 1.5K from room temperature through a novel opto-thermo-mechanical process. Finally, I will discuss the prospects for this system to be used in commercial applications as well as reaching the quantum ground state via feedback cooling.

Series IQIM Postdoctoral and Graduate Student Seminar Series

Contact: Marcia Brown at 626-395-4013 marciab@caltech.edu