Displacement sensor based on photonic crystal waveguides

Details Displacement sensor based on photonic crystal waveguides Displacement sensor based on photonic crystal waveguides

2005-11-16

2008-12-16

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S614000

Reexamination Certificate

active

07466424

ABSTRACT:
A displacement sensor comprising at least one pair of co-planar photonic crystal waveguide (PCWG) sections aligned along or parallel to a common axis and separated by a gap, one PCWG section of a pair operative to perform a displacement relative to the other section of the pair. In some embodiments, the sensor is linear, comprising two PCWG sections seperated by a gap that forms a cross PCWG, the displacement sensing performed preferrably differentially between two edges of the cross PCWG. In other embodiments, the sensor includes Mach Zehnder Interferometer (MZI) configurations with gaps between fixed and moving PCWG sections. Displacement induced changes in the gap widths are reflected in changes in an output parameter of the MZI.

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