Patent ID: 11860502
Assignee: FUNDACIÓ INSTITUT DE CIÈNCIES FOTÒNIQUES
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 21:
22. An electro-optical modulator, which implements a Mach-Zehnder interferometer based arrangement, comprising:
a semiconductor substrate;
at least first and second electrodes distanced from each other along an X-direction;
a first optical waveguide branch embedded within and/or arranged on said semiconductor substrate, an upper face of said first optical waveguide branch being located at, below or above a location between said first and second electrodes, along said X-direction, wherein said first optical waveguide branch longitudinally extends along at least a direction transversal to said X-direction;
a bottom graphene sheet arranged and extending along said X-direction over at least a portion of the upper face of the semiconductor substrate, with a first end electrically connected to said first electrode and without the bottom graphene sheet reaching the second electrode;
a sheet of a first dielectric material extending over said bottom graphene sheet;
a top graphene sheet arranged and extending along said X-direction over at least a portion of said sheet of a first dielectric material, with a first end electrically connected to said second electrode and without the top graphene sheet reaching the first electrode;
a second dielectric material, which is a two-dimensional material with at least dielectric properties different to the dielectric properties of said first dielectric material, said second dielectric material covering:
upper and bottom faces of said top graphene sheet and/or an upper face of said bottom graphene sheet; or
upper and bottom faces of said top graphene sheet and/or both upper and bottom faces of said bottom graphene sheet; and
a second optical waveguide branch distanced from the first optical waveguide branch along the X-direction and embedded within and/or arranged on the semiconductor substrate, wherein said second optical waveguide branch longitudinally extends along at least the direction transversal to the X-direction.