A waveguide structure

G - Physics – 01 – N

Patent

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Details

G01N 21/17 (2006.01) G01N 21/77 (2006.01) G02B 6/122 (2006.01) G02B 6/26 (2006.01) G02B 6/12 (2006.01)

Patent

CA 2501267

A novel single point leaky waveguide structure and its use as an optical sensor for the detection of particles is disclosed. The waveguide structure is fabricated to increase the overlap of the evanescent field extension from the sensor surface with particles in the bulk solution of a flowing system so as to place most of the volume of the particles within the evanescent field. Increasing the overlap of the evanescent field with the particles and permitting mode propagation along the direction of flow for a few millimetres provides an effective interrogation approach for multiple particle detection in a single flow channel.

L'invention concerne une nouvelle structure de guide d'ondes à fente à point unique et son utilisation en tant que capteur optique pour la détection de particules. Cette structure de guide d'ondes est fabriquée afin d'augmenter le chevauchement de l'extension du champ évanescent de la surface du capteur avec des particules présentes dans la solution principale d'un système d'écoulement de façon à placer la plus grande partie du volume des particules à l'intérieur du champ évanescent. L'augmentation du chevauchement du champ évanescent avec les particules et une propagation modale s'effectuant sur quelques millimètres dans la direction d'écoulement permettent d'adopter une approche d'interrogation efficace pour une détection de particules polyvalente dans une seule voie d'écoulement.

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