Oscillating wave displacement sensor using the enhanced Goos-Hanchen effect in a symmetrical metal-cladding optical waveguide

An oscillating wave displacement sensor based on the enhanced Goos-Hanehen (G-H) effect in a symmetrical metal-cladding optical waveguide is proposed. Since the detected signal is irrelevant to the power fluctuation of the incident light and the magnitude of the G-H shift is enhanced to hundreds of micrometers, a 40 pm. resolution is demonstrated in our experiment without employing any complicated optical equipment and servo techniques. (C) 2008 Optical Society of America.