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

Claim 0:
1. An electro-optical modulator, comprising:
a semiconductor substrate;
at least first and second electrodes distanced from each other along an X-direction;
an optical waveguide embedded within and/or arranged on said semiconductor substrate, an upper face of said optical waveguide being located at, below or above a location between said first and second electrodes, along said X-direction, wherein said optical waveguide 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; and
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;
wherein at least one of said top and bottom graphene sheets extends along said X-direction:
above part of the width of the optical waveguide, wherein said part ranges from 50% to 100% of the width of the optical waveguide; or
completely above the whole width of the optical waveguide, and beyond through a respective further projecting portion with a length, along the X direction, of up to 25% of the optical waveguide width.