Investigation of the limit of lateral beam shifts on a symmetrical metal-cladding waveguide |
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| Authors: | Chen Lin Zhu Yi-Ming Zhang Da-Wei Cao Zhuang-Qi Zhuang Song-Lin |
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| Affiliation: | Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China; Guided Wave Photonics Group, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | This paper reports that Goos--H"anchen (GH) shiftsoccurring on a symmetrical metal-cladding waveguide areexperimentally identified. It was found that there exists a criticalthickness of the upper metal layer, h_cr, above which negativeshift is observed and, reversely, positive shift occurs. Bothpositive and negative GH shifts near the critical thickness do not varydramatically and can achieve a maximum on the submillimeter scale, whichis different from simulated results using the stationary-phasemethod. It also shows that this critical thickness, h_cr, can beobtained at the position for zero reflectivity by setting theintrinsic damping to be the same as the radiative damping. The GHeffects observed near the critical thickness are produced by extremedistortion of the reflected beam profiles, which limits theamplitude of the GH shift and, further, the sensitivity of the GH opticalsensor based on the symmetrical metal-cladding waveguide. |
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| Keywords: | Goos--H" anchen shift, symmetrical metal-claddingwaveguide, optical sensing |
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