Optical sensing device comprising a finite width strip for...

Details Optical sensing device comprising a finite width strip for... Optical sensing device comprising a finite width strip for...

G - Physics

02

B

G02B 6/12 (2006.01)

Patent

CA 2612741

An optical device has a waveguide structure comprising a thin strip (12) having finite width and thickness of material having a relatively high free charge carrier density supported by a membrane (14) having a predetermined thickness of material that has a relatively low free charge carrier density. The dimensions of the width and thickness of the strip and the thickness of the supporting membrane are such that, when the waveguide structure is surrounded at least partially by an environment (E) having a low free charge carrier density, optical radiation having a wavelength in a predetermined range couples to the waveguide structure and propagates along the length thereof as a plasmon-polariton wave that permeates at least part of the environment (E).

L~invention concerne un dispositif optique comportant une structure de guide d'ondes comprenant une fine bande (12) comportant une largeur et une épaisseur finie de matériau dont la densité de porteurs de charges libres est relativement élevée supporté par une membrane (14) comportant une épaisseur prédéterminée de matériau dont la densité de porteurs de charges libres est relativement faible. Les dimensions de la largeur et de l~épaisseur de la bande et l~épaisseur de la membrane de support sont telles que lorsque la structure de guide d'ondes est entourée au moins partiellement par un environnement (E) dont la densité de porteurs de charges est faible, une radiation optique dont la longueur d~onde est comprise dans un spectre prédéterminé se couple à la structure de guide d~ondes et se propage le long de sa longueur comme onde de polarisation de plasmon qui s'infiltre au moins partiellement dans l'environnement (E).

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