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Polarization-Insensitive Narrow Band Filter with a Symmetrical Metal-Cladding Optical Waveguide |
| LI Hong-Gen;CAO Zhuang-Qi;LU Hai-Feng; SHEN Qi-Shun |
| Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 |
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| Cite this article: |
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LI Hong-Gen, CAO Zhuang-Qi, LU Hai-Feng et al 2006 Chin. Phys. Lett. 23 643-644 |
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Abstract We demonstrate the promising configurations that permit very narrow spectral filtering. The waveguide filter consists of a glass slab with an anomalous thickness of about 500μm, which is sandwiched between two pre-coated metal films. By using the free-space coupling technique, a polarization-insensitive and tunable notch filter with a spectral bandwidth as narrow as 0.08nm has been obtained due to the excitation of ultrahigh-order modes of the symmetrical metal-cladding optical waveguide.
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| Keywords:
42.79.Ci
42.79.Gn
42.82.Et
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Published: 01 March 2006
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| PACS: |
42.79.Ci
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(Filters, zone plates, and polarizers)
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42.79.Gn
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(Optical waveguides and couplers)
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42.82.Et
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(Waveguides, couplers, and arrays)
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