Superiorly low half-wave voltage electro-optic polymer modulator for visible photonics

Abstract

Chip-scale optical devices operated at wavelengths shorter than communication wavelengths, such as LiDAR for autonomous driving, bio-sensing, and quantum computation, have been developed in the field of photonics. In data processing involving optical devices, modulators are indispensable for the conversion of electronic signals into optical signals. However, existing modulators have a high half-wave voltage-length product ( V π L ) which is not sufficient at wavelengths below 1000 nm. Herein, we developed a significantly efficient optical modulator which has low V π L of 0.52 V·cm at λ = 640 nm using an electro-optic (EO) polymer, with a high glass transition temperature ( T g = 164 °C) and low optical absorption loss (2.6 dB/cm) at λ = 640 nm. This modulator is not only more efficient than any EO-polymer modulator reported thus far, but can also enable ultra-high-speed data communication and light manipulation for optical platforms operating in the ranges of visible and below 1000 nm infrared.