A superhigh-frequency optoelectromechanical system based on a slotted photonic crystal cavity

TL;DR

This paper presents an integrated superhigh-frequency optoelectromechanical system using a slotted photonic crystal cavity, enabling efficient electrical excitation and optical detection of GHz-range acoustic modes.

Contribution

It introduces a novel ultrahigh-Q slotted photonic crystal nanocavity system with electromechanical and optomechanical interactions operating up to 4.20 GHz.

Findings

Achieved identification of acoustic modes up to 4.20 GHz

Mechanical Q factors ranged from 240 to 1,730

Demonstrated direct microwave-optical signal linking

Abstract

We develop an all-integrated optoelectromechanical system that operates in the superhigh frequency band. This system is based on an ultrahigh-Q slotted photonic crystal (PhC) nanocavity formed by two PhC membranes, one of which is patterned with electrode and capacitively driven. The strong simultaneous electromechanical and optomechanical interactions yield efficient electrical excitation and sensitive optical transduction of the bulk acoustic modes of the PhC membrane. These modes are identified up to a frequency of 4.20 GHz, with their mechanical Q factors ranging from 240 to 1,730. Directly linking signals in microwave and optical domains, such optoelectromechanical systems will find applications in microwave photonics in addition to those that utilize the electromechanical and optomechanical interactions separately.