Journal Article

Fast and low energy-consumption integrated Fourier-transform spectrometer based on thin-film lithium niobate

Ruan, Ziliang, Liu, Liu, Wang, Xijie, Chen, Kaixuan, Chen, Bin, Chen, Gengxin, Wang, Mai

2024

Overview

Integrated miniature spectrometers have impacts in industry, agriculture, and aerospace applications due to their unique advantages in portability and energy consumption. Although existing on-chip spectrometers have achieved breakthroughs in key performance metrics, such as, a high resolution and a large bandwidth, their scanning speed and energy consumption still hinder practical applications of such devices. Here, a stationary Fourier transform spectrometer is introduced based on a Mach–Zehnder interferometer structure on thin-film lithium niobate. Long and low-loss spiral waveguides with electro-optic tuning are adopted as the optical path scanning elements with a half-wave voltage of 0.14 V. A high resolution of 2.1 nm and a spectral recovery with a bandwidth of 100 nm is demonstrated under a high-speed and high-voltage scanning in the range of −100 V to +100 V at up to 100 KHz. A low energy consumption in the μJ scale per scan is also achieved.

• Publisher: De Gruyter,Walter de Gruyter GmbH
• Subject: Bandwidths / electro-optical modulator / Electrodes / Energy consumption / Fourier transform spectrometers / Fourier transforms / Fourier-transform spectrometer / High resolution / Laboratories / Lithium / lithium niobate / Lithium niobates / Mach-Zehnder interferometers / Optics / Performance measurement / Photonics / Research centers / spiral waveguide / Thin films / Waveguides