Observation of photoacoustic/photothermal effect with a liquid-core optical ring resonator

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2017,（7）
• 页码范围: 86-90
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201715.072301

摘要

Photothermal/photoacoustic (PT/PA) spectroscopy provides useful knowledge about optical absorption,as well as the thermal and acoustical properties of a liquid sample.For microfluidic biosensing and bioanalysis where an extremely small volume of liquid sample is encapsulated,simultaneous PT/PA detection remains a challenge.In this work,we present a new optofluidic device based on a liquid-core optical ring resonator (LCORR) for the investigation of PT and PA effects in fluid samples.A focused 532 nm pulsed light optically heats the absorptive fluid in a capillary to locally create a transient temperature rise,as well as acoustic waves.A 1550 nm CW laser light is quadrature-locked to detect the resonance spectrum shift of the LCORR and study thermal diffusion and acoustic wave propagation in the capillary.This modality provides an optofluidic investigative platform for biological/biochemical sensing and spectroscopy.