WGM ultrasound probe with a DFB laser tuning system for ultrasensitive solution concentration detection
Year: 2025
Type: article
Abstract: Accurate liquid concentration detection is vital for medical, industrial, and environmental applications, yet conventional methods still face limitations.We propose an ultrasound probe with a self-assembled polymer whispering-gallery-mode (WGM) microcavity, leveraging the photoacoustic (PA) effect and a distributed feedback (DFB) laser tuning system for ultrasensitive quantification.The probe achieves 13.5 Pa sensitivity and 42 MHz bandwidth (-6 dB), ensuring broad applicability in diverse liquids.Overcoming traditional WGM sensors' instability, our integrated platform demonstrates a recordlow detection limit of 10 -7 g/mL for crystal violet among substrate-free, real-time methods.Unifying the microcavity, laser, and electronics into a portable architecture, this system enables high-fidelity, nondestructive liquid analysis with strong anti-interference and endoscope-deployable sensing in complex environments.
Source: Chinese Optics Letters
Authors: Jialüe Sun, Tinglan Chen, Shengnan Huangfu, Zelong Wang, Liaosha Kuang, Zijing Cai, Yanjie Bai, Bowen Ruan, Fangxing Zhang
Institutions: Peking University, Nantong University
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
Awards: G5979214521, G89605461
OpenAlex ID: W4414675522