Patent ID: 11874540
Assignee: UNIVERSITY OF SOUTHAMPTON
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A method of fabricating a resonator modulator of claim 1, the method comprising the following steps:
providing a substrate, the substrate comprising a semiconductor layer on a underlaying layer on a semiconductor substrate layer;
depositing or growing an insulating layer onto the semiconductor layer,
etching through the insulating layer and the semiconductor layer to the underlaying layer to form a well, the well comprising an inner wall and a base formed by the underlaying layer;
depositing or growing an insulating material onto the inner wall to form a ring-shaped insulating region;
depositing a polycrystalline semiconductor material onto the ring-shaped insulating region to fill the well, and
a planarising step comprising removing a portion of the polycrystalline semiconductor material and the insulating layer to form a capacitor comprising the ring-shaped insulating region sandwiched between an outer conductive region and an inner conductive region, wherein the inner conductive region is formed of the polycrystalline semiconductor material and the outer conductive region is formed of the crystalline material.