Electro-optic modulators

G - Physics – 02 – F

Patent

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G02F 1/035 (2006.01)

Patent

CA 2486498

A low loss, low drive voltage plasmon-polariton electro-optic modulator based on mode cutoff comprises a waveguide structure formed by a thin metallic strip (106) surrounded by material (102, 104) having a relatively low free charge carrier density. The metallic strip has finite width and thickness with dimensions such that optical radiation having a wavelength in a predetermined range couples to the metallic strip and propagates along the length of the metallic strip as a plasmon-polariton wave. The surrounding material comprises two distinct portions (102, 104) with the metallic strip extending between them. The modulator comprises means (108A, 112) for varying an electric field applied to at least one portion so as to vary the value of the electromagnetic property and thereby the propagation characteristics of the plasmon-polariton wave.

Un modulateur électro-optique à plasmon-polariton à faible coût et basse tension d'excitation basé sur la coupure de mode comprend une structure de guide d'onde composée d'une bande métallique mince (106) entourée d'un matériau (102, 104) ayant une densité de porteuse de charge libre relativement basse. La bande métallique présente une largeur finie et une épaisseur aux dimensions telles qu'un rayonnement optique, d'une longueur d'onde dans une gamme prédéterminée, se couple à la bande métallique et se propage sur la longueur de la bande métallique sous la forme d'une onde plasmon-polariton. Le matériau enveloppant comprend deux parties distinctes (102, 104) entre lesquelles s'étend la bande métallique. Le modulateur comprend des moyens (108A, 112) permettant de faire varier un champ électrique appliqué à au moins une partie, afin de varier la valeur de la propriété électromagnétique et ainsi les caractéristiques de propagation de l'onde plasmon-polariton.

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