Tunnelling leaky modes on optical waveguides |
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Authors: | Allan W. Snyder John D. Love |
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Affiliation: | Institute of Advanced Studies, Department of Applied Mathematics, Australian National University, Canberra, 2600 Australia |
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Abstract: | The lossless dielectric waveguide of circular cross section with an index of refraction greater than its surround supports trapped modes in addition to two subclasses of leaky modes: refracting and tunnelling modes. Refracting modes leak because their fields are formed by waves that undergo refraction at the core-cladding interface. Tunnelling modes leak because their fields are formed by waves that undergo a form of electromagnetic tunnelling at the core-cladding interface due to the curvature of its cross section. Tunnelling modes have a very slow leakage compared to refracting modes and are therefore important for the understanding of propagation in multimode, optical waveguides of circular cross section. |
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