Investigation of the limit of lateral beam shifts on a symmetrical metal-cladding waveguide
Chen Lin(陈麟)a)†,Zhu Yi-Ming(朱亦鸣) a)‡,Zhang Da-Wei(张大伟)a), Cao Zhuang-Qi(曹庄琪)b), and Zhuang Song-Lin(庄松林) a)
a Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China; b Guided Wave Photonics Group, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract This paper reports that Goos--Hänchen (GH) shifts occurring on a symmetrical metal-cladding waveguide are experimentally identified. It was found that there exists a critical thickness of the upper metal layer, $h_{cr}$, above which negative shift is observed and, reversely, positive shift occurs. Both positive and negative GH shifts near the critical thickness do not vary dramatically and can achieve a maximum on the submillimeter scale, which is different from simulated results using the stationary-phase method. It also shows that this critical thickness, $h_{cr}$, can be obtained at the position for zero reflectivity by setting the intrinsic damping to be the same as the radiative damping. The GH effects observed near the critical thickness are produced by extreme distortion of the reflected beam profiles, which limits the amplitude of the GH shift and, further, the sensitivity of the GH optical sensor based on the symmetrical metal-cladding waveguide.
Received: 28 February 2009
Revised: 25 March 2009
Accepted manuscript online:
Fund: Project supported by the Research
Fund for Selecting and Training Excellent Young Teachers in
Universities of Shanghai, Shanghai Municipal Education Commission
(Grant No slg08006), ``Chen Guang'' project of Shanghai Municipal
Education Commission and Shanghai Education Development Foundation
(Grant No 09CG49), Dawn Project of Education Committee of Shanghai
and Shanghai Education Development Foundation (Grant No 08SG48),
Innovation Program of Shanghai Municipal Education Commission (Grant
No 09YZ221) and the Program from Shanghai Committee of Science and
Technology, China (Grant Nos 07DZ22026 and 08ZR1415400).
Cite this article:
Chen Lin(陈麟),Zhu Yi-Ming(朱亦鸣),Zhang Da-Wei(张大伟), Cao Zhuang-Qi(曹庄琪), and Zhuang Song-Lin(庄松林) Investigation of the limit of lateral beam shifts on a symmetrical metal-cladding waveguide 2009 Chin. Phys. B 18 4875
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