Microfluidic Whispering Gallery Mode Optical Sensors for Biological Applications

Yuye Wang (1) , Shuwen Zeng (1) , Georges Humbert (1) , Ho-Pui Ho (2)

1 XLIM-PHOT - Photonique Fibre et Sources Cohérentes
2 CUHK - The Chinese University of Hong Kong [Hong Kong]

Whispering gallery mode (WGM) resonators have been exploited as a highly sensitive and efficient sensing technique in the past few years. They offer the advantages of ultra-high sensitivity, compact size and label-free sensing capability. More recently, with the rapid development of microfluidic technologies, many integrated WGM sensors, by combining the portability of lab-on-chip devices and the high sensitivity of WGM resonators, have emerged. The capabilities of efficient sample handling and multiplexed analyte detection offered by these systems have led to many biological and chemical sensing applications, especially for the detection of single particle or biomolecule. In this review, different sensing mechanisms based on integrated whispering gallery mode resonators are introduced. Various geometries of WGM cavities including solid, liquid and hollow resonators and a detailed discussion on their integration with microfluidic devices are also covered. Different types of packaging schemes and integration methods are compared in terms of ease of fabrication and device performance. Finally, recent applications of microfluidic-based WGM sensors for detecting biological and chemical target molecules are discussed, with a prospect on future challenges and trends of development in microfluidics for multiplexed detection.

Mots clés: Integrated sensors; Optical micro resonators; Optofluidics; Multiplexed detection; Label-free optical sensing

Domaines: Sciences de l'ingénieur [physics]

Yuye Wang, Shuwen Zeng, Georges Humbert, Ho-Pui Ho. Microfluidic Whispering Gallery Mode Optical Sensors for Biological Applications. Laser and Photonics Reviews, 2020, ⟨10.1002/lpor.202000135⟩. ⟨hal-03023104⟩