# Photoacoustic Noninvasive Blood Glucose Monitoring: A Review of Systems and Strategies for Robust Glucose Concentration Estimation, with Perspectives on Miniaturization and Wearability

## TL;DR

This paper reviews photoacoustic technology for noninvasive blood glucose monitoring, focusing on system design, interference mitigation, and wearable integration.

## Contribution

The paper provides a comprehensive review and proposes multi-technology integration strategies for wearable photoacoustic glucose monitoring systems.

## Key findings

- Photoacoustic sensing offers molecular specificity and deep penetration for glucose monitoring.
- Strategies for interference mitigation and signal enhancement are summarized for real-world applications.
- Recent advances in microsystem design are analyzed to enable wearable photoacoustic systems.

## Abstract

Noninvasive blood glucose monitoring has long been a critical research focus in diabetes management. Among emerging technologies, photoacoustic sensing, combining the molecular specificity with deep penetration, has garnered significant attention. It offers rapid response and pain-free operation, making it a strong candidate for next-generation portable blood glucose monitoring devices. This review systematically traces the development and current state of photoacoustic glucose sensing, with a particular focus on the selection and optimization of core system components. It also summarizes common interference in glucose detection and outlines strategies for their mitigation, along with signal processing and signal-to-noise ratio enhancement techniques suitable for real-world applications. Addressing the growing demand for wearable continuous glucose monitors, this work analyzes the key challenges in system integration and outlines recent advances in enabling technologies. It proposes multi-technology integration approaches to bridge the gap between photoacoustic sensing and microsystem design, offering theoretical foundations and practical guidance for future research on wearable photoacoustic systems.