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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Si3N4 Microring Resonator-Based Refractive Index Sensing for Liquid Samples: Comparing Wavelength Scanning and

Daniela Tomasetig1, Jesus Hernan Mendoza-Castro1, Silvia Schobesberger2

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Summary

This study introduces a silicon nitride microring resonator (MRR) for real-time refractive index (RI) sensing in microfluidic systems. The chip-scale detector offers high sensitivity and speed, outperforming commercial devices for liquid analysis.

Keywords:
microfluidicsmicroring resonatoron-chip sensingrefractive index sensingsugars

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Area of Science:

  • Photonics and Microfluidics
  • Analytical Chemistry
  • Biosensing

Background:

  • Refractive index (RI) measurement is crucial for liquid sensing, but commercial detectors have limitations in range and speed.
  • Microring resonators (MRRs) integrated with microfluidics offer enhanced RI sensing performance with low sample volume and increased dynamic range.

Purpose of the Study:

  • To develop and demonstrate a compact, chip-scale refractive index detector using a silicon nitride (Si3N4) microring resonator (MRR) integrated into a microfluidic system.
  • To compare two interrogation modalities for flow-through liquid sensing: resonance wavelength scanning and fixed-wavelength probing.
  • To evaluate the device's performance for real-time measurements under dynamic flow conditions and its applicability in chromatographic separations.

Main Methods:

  • Fabrication of a silicon nitride (Si3N4) microring resonator (MRR) integrated with a low-volume microfluidic system.
  • Experimental comparison of resonance wavelength scanning and fixed-wavelength probing for interrogating the MRR.
  • Benchmarking the device against a commercial RI detector using glucose solutions.
  • Demonstration of the sensor's capability in resolving transient RI peaks during the isocratic separation of four sugars.

Main Results:

  • The Si3N4 MRR-based detector achieved high sensitivity (113 nm/RIU) and a low limit of detection (sLOD of 2.3 × 10-6 RIU).
  • The device demonstrated real-time operation under dynamic flow conditions, successfully resolving transient refractive index peaks.
  • Successful application in an isocratic separation of four sugars, showcasing its utility in chromatographic analysis.

Conclusions:

  • Integrated Si3N4 MRRs provide a versatile and miniaturized platform for quantitative, high-speed refractive index sensing in flow-based analytical systems.
  • The developed chip-scale RI detector offers enhanced performance compared to commercial alternatives, particularly for dynamic flow conditions.
  • This technology holds significant potential for advanced sensing schemes and applications in separation sciences and biosensing.