On-chip electro-optic tuning of a lithium niobate microresonator with integrated in-plane microelectrodes

TL;DR

This paper demonstrates on-chip electro-optic tuning of a lithium niobate microresonator using integrated in-plane microelectrodes, achieving a high tuning coefficient through femtosecond laser fabrication techniques.

Contribution

It introduces a novel fabrication process for integrated microelectrodes and demonstrates effective electro-optic tuning of a lithium niobate microresonator.

Findings

High electro-optical tuning coefficient of 3.41 pm/V achieved

Microelectrodes fabricated via femtosecond laser process

Microresonator tuning demonstrated on-chip

Abstract

We demonstrate electro-optic tuning of an on-chip lithium niobate microresonator with integrated in-plane microelectrodes. First two metallic microelectrodes on the substrate were formed via femtosecond laser process. Then a high-Q lithium niobate microresonator located between the microelectrodes was fabricated by femtosecond laser direct writing accompanied by focused ion beam milling. Due to the efficient structure designing, high electro-optical tuning coefficient of 3.41 pm/V was observed.