We report the observation of anomalous behavior in the spectral sensitivity response in a specially designed waveguided interferometer sensor. Approaching a definite critical point, the sensitivity increases nonlinearly. Furthermore, at the critical wavelength a new effect of splitting or bifurcation of a minimum dip is observed. The value of the splitting is suggested as an advantageous measure for sensing.
© 2009 Optical Society of America
Original Manuscript: May 14, 2009
Revised Manuscript: July 5, 2009
Manuscript Accepted: August 29, 2009
Published: September 30, 2009
Ronen Levy, Shlomo Ruschin, and Damian Goldring, "Critical sensitivity effect in an interferometer sensor," Opt. Lett. 34, 3023-3025 (2009)