| 摘要 |
<p>A waveguide assembly 100 comprises a first guide element 101, a second guide element 102 and a coupling element 106 for coupling radiation between the first element and the second element. The first element, second element and coupling element comprising a refractive index along the optical path which is greater than a refractive index of a medium surrounding the elements, such as air. The first and second elements are spaced by gap 108a and 108b from the coupling element and the medium extends between the first element and the coupling element and second element and the coupling element. Radiation is arranged to couple between the first and second guide elements by reflecting within the coupling element from an interface between the coupling element and the medium. The assembly may include light sources 109, 110, 111 of different wavelengths, and have a further coupling element 107 for coupling to a third guide 103. The coupling elements may have a dichroic coating 106d, 107d.</p> |
