Optical device

An optical device comprising:

• a substrate;
• a lower electrode on the substrate;
• a lower cladding on the lower electrode;
• a first core and a second core on the lower cladding;
• an upper cladding covering the first and second cores;
• and
• an upper electrode on the upper cladding,
• wherein the lower electrode, the first core, and the upper electrode vertically overlap each other vertically,
• the lower electrode, the second core, and the upper electrode vertically overlap each other, and
• the first core and the second core comprise ferroelectric materials that are polarized in directions different from each other.

A method for manufacturing an optical device, the method comprising:

• forming a lower electrode on a substrate;
• forming a lower cladding on the lower electrode;
• forming a core layer comprising a ferroelectric material polarized in a first direction on the lower cladding;
• forming a polling electrode overlapping the core layer;
• and
• applying a voltage to the lower electrode and the polling electrode to change a polarization direction of a first portion of the core layer.