Abstract
We demonstrate on-chip laser absorption spectroscopy using silicon microring resonators integrated with PDMS microfluidic channels. A 100 microm radius microring resonator with Q > 100,000 is used to enhance the interaction length between evanescent light and a cladding liquid. We measure absorption spectra of less than 2 nL of N-methylaniline from 1460 nm to 1610 nm with 1 nm resolution and effective free space path lengths up to 5 mm. This work can help realize a completely on-chip spectroscopy device for lab-on-a-chip applications.
Highlights
We demonstrate on-chip laser absorption spectroscopy using silicon microring resonators integrated with PDMS microfluidic channels
Optofluidic techniques where microfluidics are integrated with photonic components are gaining widespread use in biosensing and chemical analysis applications [1]
In this work we demonstrate both integrated and broadband absorption spectroscopy in the near infrared using microring resonators and microfluidic channels
Summary
Optofluidic techniques where microfluidics are integrated with photonic components are gaining widespread use in biosensing and chemical analysis applications [1]. Incorporating advanced fluid handling techniques at the micron scale with highly sensitive photonic devices has the potential to provide compact, effective sensors for lab-on-a-chip tools [2]. Absorbance-based optofluidic techniques are attractive since they offer the potential to provide label-free spectral information for detection and identification of an analyte [8]. The miniaturization of microfluidic devices reduces the optical path length for absorption based sensors as compared to macroscopic experiments. A shortened optical path reduces the interaction length of light with a fluid and limits the sensitivity of a device and its ability to detect an absorbing species. In this work we demonstrate both integrated and broadband absorption spectroscopy in the near infrared using microring resonators and microfluidic channels
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
