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Surface waveguide having a tapered region and method of forming

  • US 9,020,317 B2
  • Filed: 10/11/2013
  • Issued: 04/28/2015
  • Est. Priority Date: 10/11/2012
  • Status: Active Grant
First Claim
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1. An article comprising a surface waveguide having a core, wherein the surface waveguide includes:

  • (1) a first region in which the core includes;

    (a) a first layer comprising a first material, the first layer having a first thickness;

    (b) a second layer comprising the first material; and

    (c) a third layer that is between the first layer and the second layer, the third layer comprising a second material, wherein the third layer enables optical coupling of the first layer and second layer such that they collectively support propagation of a light signal in the first region such that it has a first mode-field profile;

    (2) a second region in which the core includes the second layer and not the first layer, wherein the core in the second region supports propagation of the light signal such that it has a second mode-field profile; and

    (3) a transition region in which the core includes;

    (a) the first layer, wherein the first layer has a thickness that changes monotonically from the first thickness to extinction;

    (b) the second layer; and

    (c) the third layer;

    wherein the transition region is between the first region and the second region, and wherein the transition region is operative for adiabatically transitioning the mode-field profile of the light signal between the first mode-field profile and the second mode-field profile.

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