Wavelength sensing based on the Goos-Hänchen effect in the symmetrical metal-cladding waveguide structure

Yi Wang; Zhuangqi Cao; Xiaoguo Jiang; Qin Li

doi:10.1117/12.974319

15 October 2012 Wavelength sensing based on the Goos-Hänchen effect in the symmetrical metal-cladding waveguide structure

Yi Wang, Zhuangqi Cao, Xiaoguo Jiang, Qin Li

Author Affiliations +

Proceedings Volume 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy; 841902 (2012) https://doi.org/10.1117/12.974319
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

The Goos-Hänchen (GH) effect, which is enhanced by the resonance of guided modes in the symmetrical metal-cladding waveguide (SMCW) structure, is used to detect slight variations of the light wavelength. The SMCW is a special optical waveguide structure, typically consisting of a guiding layer and two metal-cladding layers. Compared with traditional dielectric waveguide, the SMCW possesses a broader range of effective refractive index (RI), i.e. from zero to the RI of the guiding layer, which enables directly coupling of light energy from free space into the waveguide. Theoretical analysis indicates that the GH effect is closely related to the intrinsic damping and the radiative damping of the waveguide structure. Proper parameters are selected to match the two dampings, and great enhancement of the GH shift is obtained consequently. Ultrahigh-order modes excited in the SMCW with a sub-millimeter scale of the guiding layer exhibit a strong dispersion effect of the light wavelength, which manifests itself as wavelength-dependent lateral shift of the reflected beam. Position sensitive detector is used to monitor the lateral beam shift which changes rapidly with respect to the light wavelength. Since the detecting signal is proportional to the displacement of the light beam, the measurement can effectively avoid being affected by the fluctuation of the light intensity. A wavelength resolution of 0.2 pm near the wavelength of 859 nm is demonstrated in the experiment.

Citation Download Citation

Yi Wang, Zhuangqi Cao, Xiaoguo Jiang, and Qin Li "Wavelength sensing based on the Goos-Hänchen effect in the symmetrical metal-cladding waveguide structure", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 841902 (15 October 2012); https://doi.org/10.1117/12.974319

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KEYWORDS

Waveguides

Gold

Refractive index

Signal detection

Prisms

Dielectrics

Dispersion

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