Carbon nanofibers and nanotubes are currently being utilized as active elements in acoustic sensors for emerging microelectromechanical systems and nanoelectromechanical systems technologies. A methodology for measuring the displacement of carbon nanofibers in combination with heterodyne interferometry is reported here. Experimental results show that ultrasonic field detection is possible using this technique, and results are presented for measurements in the ultrasonic frequency range. This approach could potentially lead to new calibration methods for ultrasonic sensors. A different approach to that of interferometry is also reported for future investigation.
© 2008 Optical Society of America
Original Manuscript: November 27, 2007
Revised Manuscript: March 4, 2008
Manuscript Accepted: March 18, 2008
Published: April 25, 2008
T. Koukoulas, P. D. Theobald, B. Zeqiri, I. Y. Bu, and W. I. Milne, "Utilization of carbon nanofibers for airborne ultrasonic acoustic field detection using heterodyne interferometry," Opt. Lett. 33, 947-949 (2008)